А. D. Vanyashov, A. V. Zherelevich
Reduction of noise characteristics of the piping of centrifugal compressors
DOI: https://doi.org/10.25206/2588-0373-2026-10-2-5-13
The purpose of the research is to reduce the noise indicators of gas compressor stations while minimizing the cost of sound insulation of process pipelines. The authors use calculated methods for studying the sound-insulating ability of materials and coatings. Moreover, the authors conduct an assessment of the reduction in the level of aerodynamic noise emitted by a centrifugal compressor operating as a part of the gas compressor unit of the 16 MW gas turbine at the compressor station of the main gas pipeline. Instead of traditional solutions with sound insulation coatings on the elements of the external piping of the centrifugal compressor and the entire compressor station, the article considers alternative options, which consist in minimizing sound insulation coatings and localizing them only on the discharge nozzle of the compressor for the effect of heat insulation. The authors demonstrate that an increase in the wall thickness of pipelines on 50 % higher than the calculated value corresponding to the strength class of the pipeline material, together with the use of blade-free diffusers in the flow section of the centrifugal compressor affects the decrease in the sound pressure level in nine calculated octave frequency bands, which is similar to the application of a sound insulation coating. The obtained results confirm their feasibility and effectiveness in achieving acceptable noise levels and also prove simplifying maintenance and diagnostics of the compressor station pipelines.

Keywords: compressor station, gas compressor unit, centrifugal compressor, piping, sound insulation coatings, sound absorbing materials, acoustic calculation

For citation: Vanyashov А. D., Zherelevich A. V. Reduction of noise characteristics of the piping of centrifugal compressors. Omsk Scientific Bulletin. Series Aviation-Rocket and Power Engineering. 2026;10(2):5–13. https://doi.org/10.25206/2588-0373-2026-10-2-5-13. EDN: STQGNQ. (In Russ.).

Yu. B. Galerkin, A. F. Rekstin, L. G. Kuznetsov, V. B. Semenovskiy, O. A. Solovyeva, M. A. Rozhnovsky
Simulation of the pressure characteristics of the centrifugal compressor impeller on the basis of a “non-viscous” calculation
DOI: https://doi.org/10.25206/2588-0373-2026-10-2-14-23
To design the impeller and to calculate gas-dynamic characteristics is necessary to follow the dependence of the pressure on the flow rate. The article uses quasi-three-dimensional approaches to study the pressure characteristics of centrifugal impellers. These approaches do not allow determining the impeller efficiency, but allow determining the effectiveness of the selected geometry based on a qualitative analysis of the velocity distribution diagrams across the blade surfaces. The second approach is a one-dimensional mathematical model that includes empirical relations linking losses in the flow path elements to their dimensions and design parameters. Therefore, the authors use PC programs of the Universal Design Method of the Peter the Great St. Petersburg Polytechnic University. The dependence “loading factor – flow rate coefficient at the impeller outlet” is linear practically. This dependence is specified by the value of the loading factor at zero flow and the angle of inclination of the pressure characteristics. The authors compare measured characteristics of the impellers of the model stages of the Peter the Great St. Petersburg Polytechnic University with the characteristics calculated for the inviscid flow. The research establishes relations between the first and second ones, approximated by algebraic equations. These equations represent the required mathematical expression of pressure characteristics. 

Keywords: model stage, pressure characteristic, loading factor, flow coefficient, mathematical model, inviscid quasi-three-dimensional calculation, impeller, head characteristic inclination angle

For citation: Galerkin Yu. B., Rekstin A. F., Kuznetsov L. G., Semenovskiy V. B., Solovyeva O. A., Rozhnovsky M. A. Simulation of the pressure characteristics of the centrifugal compressor impeller on the basis of a “non-viscous” calculation. Omsk Scientific Bulletin. Series Aviation-Rocket and Power Engineering. 2026;10(2):14–23. https://doi.org/10.25206/2588-0373-2026-10-2-14-23. EDN: UHJWVJ. (In Russ.).

V. A. Futin
Increasing the efficiency of power plants with heat recovery of automotive equipment by using a working substance with optimal physical properties
DOI: https://doi.org/10.25206/2588-0373-2026-10-2-24-30
An urgent issue is to increase the efficiency of the internal combustion engine through the use of a Rankine regenerative cycle, which allows converting heat losses into additional useful work, which can lead to lower fuel consumption and resource savings. Based on the analysis of modern literature, it has been shown that the effectiveness of the Rankine cycle depends on the properties of the working substances that implement the cycle. The paper examines the effects of the physical properties of working substances on the efficiency of the Rankine regenerative cycle. At the same time, all working substances are divided into three groups: 1–3 atomic, 4–6 atomic and with more than six atoms. Each group has its own type of T-S chart. Physical and mathematical models of physical properties have been developed for each group of substances. Based on models of physical properties, expressions for the efficiency of the Rankine cycle for these groups of substances are obtained. Moreover, dimensionless relative and reduced values are introduced into consideration. The author provides a numerical and graphical analysis of the dependence of the efficiency of the Rankine cycle on the basic dimensionless quantities. Therefore, the author develops recommendations for the selection or synthesis of the optimal working substance implementing the Rankine cycle.

Keywords: Rankine cycle, efficiency, theoretical research, number of atoms, temperature, pressure, working substance

For citation: Futin V. A. Increasing the efficiency of power plants with heat recovery of automotive equipment by using a working substance with optimal physical properties. Omsk Scientific Bulletin. Series Aviation-Rocket and Power Engineering. 2026;10(2):24–30. https://doi.org/10.25206/2588-0373-2026-10-2-24-30. EDN: XJVDCA. (In Russ.).

V. L. Yusha, S. S. Busarov, A. V. Nedovenchany
Single-stage refrigeration long-stroke piston compressor with a long working cycle and intensive external cylinder cooling: Features of working processes
DOI: https://doi.org/10.25206/2588-0373-2026-10-2-31-39 
The article considers the influence of the design and operating parameters of a single-stage low-speed reciprocating piston compressor on the changes in ammonia state parameters during the compression process. The research presents a calculation method for the actual operating process of such a compressor stage in a single-phase formulation considering the processes of non-stationary heat conduction with the combined application of boundary conditions of the 2nd and 3rd types. The authors performs the design and operating parameters of the stage as independent parameters: a comparative analysis of the changes in the ammonia state parameters during the compression process for boiling temperatures of 228, 243, and 258 K and for a condensation temperature of 323 K with a change in the piston stroke to cylinder diameter ratio from 12.5 to 50; cycle time from 1 to 6 s; the ratio of the forward stroke time to the return stroke time from 1:1 to 1:3; the change in the heat flux density on the outer cylinder surface up to 50 %. Moreover, the research demonstrates that for certain combinations of the specified design and operating parameters of the compressor stage, the ammonia state parameters during compression may correspond to those in the wet vapor region, which suggest the possibility of partial refrigerant condensation in the stage working chamber. However, the mathematical model widely used to calculate the operating processes of refrigeration compressors is only valid in the dry superheated vapor region. Therefore, the obtained results related to the possibility of refrigerant condensation can only be an informed assumption. However, considering the predicted efficiency of refrigerant compression, the results are an indirect confirmation of the relevance of developing methods for experimental and theoretical research of the operating processes of compressors of this type in the sphere of wet steam.

Keywords: reciprocating refrigeration compressor, ammonia, low-speed long-stroke stage, intensive external cooling, operating processes, state parameters, wet vapor area, calculation method

For citation: Yusha V. L., Busarov S. S., Nedovenchany A. V. Single-stage refrigeration long-stroke piston compressor with a long working cycle and intensive external cylinder cooling: Features of working processes. Omsk Scientific Bulletin. Series Aviation-Rocket and Power Engineering. 2026;10(2):31–39. https://doi.org/10.25206/2588-0373-2026-10-2-31-39. EDN: CDOZHI. (In Russ.).

O. S. Malinina, I. A. Zaitsev
Use of an absorption bromistolithium refrigerating machine in an air conditioning system at a synthetic resin production facility using waste steam
DOI: https://doi.org/10.25206/2588-0373-2026-10-2-40-48
The article examines the effectiveness of the absorption bromistolithium refrigerating machine in an air conditioning system at a synthetic resin production facility using waste steam. The research demonstrates an energy assessment of the system, which proves the high efficiency of an absorption bromistolithium refrigerating machine by using secondary energy resources. The paper examines the principal technological scheme, which includes a central air conditioner with a water air cooler and a steam air heater. The authors use methods of thermal and exergy analysis, as well as standard calculation methods for a single-stage absorption cycle for the energy assessment. It is established that chilled water, produced in the evaporator, maintains the required supply air temperature. The heat is removed from the condenser and the absorber by means of a cooling tower, which ensures a closed cycle of cooling water use. There are three main operating modes of the system: summer (cooling), winter (direct steam heating) and hybrid (dehumidification with subsequent heating). The obtained results confirm the high energy and environmental efficiency of using secondary energy resources for air conditioning needs in chemical enterprises.

Keywords: absorption bromistolithium refrigerating machine, waste steam, recycling of secondary energy resources, thermal coefficient, synthetic resins, trigeneration 

For citation: Malinina O. S., Zaitsev I. A. Use of an absorption bromistolithium refrigerating machine in an air conditioning system at a synthetic resin production facility using waste steam. Omsk Scientific Bulletin. Series Aviation-Rocket and Power Engineering. 2026;10(2):40–48. https://doi.org/10.25206/2588-0373-2026-10-2-40-48. EDN: EMLEUJ. (In Russ.).

I. V. Nikitaev, P. N. Volskiy
Adaptation of the high-cycle fatigue model for assessing the service life of metal structures of floating cranes
DOI: https://doi.org/10.25206/2588-0373-2026-10-2-49-56 
The article addresses the pressing issue of increasing the reliability of residual service life assessments for metal structures of floating cranes operating for long periods under significant static and cyclic loads. The aim of the research is to develop and validate a methodology for estimating the residual service life of floating cranes based on an adapted mathematical model, considering the combined action of low- and high-cycle fatigue mechanisms under complex disproportionate loading. The research is based on an integrated approach, including: analysis of the design features and operating conditions of floating cranes; A generalization of the fundamental principles of damaged environment mechanics and fatigue failure theories; mathematical modeling of damage accumulation processes using evolutionary equations that take into account kinematic hardening and loading history; finite element modeling of the stress-strain state of metal structures; numerical verification of the model based on experimental data for structural steels; and the development of a two-level methodology integrating global structural analysis and local analysis in hazardous areas. The authors prove the need to account for high-cycle fatigue and transient deformation phenomena, which are not considered in traditional elastic analysis models and can lead to non-conservative estimates. The authors propose an adapted mathematical model of a damaged environment, developed in the works of Yu. G. Korotkikh and his scientific school as a methodological basis. This model, unlike classical approaches, considers the loading history, kinematic hardening, and the combined action of lowand high-cycle fatigue mechanisms. Moreover, the results of model verification using structural steels are presented, demonstrating its high accuracy in describing damage accumulation processes under multiaxial stress conditions. The article demonstrates a comprehensive service life assessment methodology, integrating finite element analysis of the global floating crane structure and subsequent local stress-strain analysis using an adapted model. Therefore, the authors show that the proposed approach enables a transition from conservative estimates to predictions based on modeling the actual history of operational loads, thereby significantly improving the validity of decisions on extending the service life of critical engineering structures.

Keywords: floating cranes, fatigue life, multi-cycle fatigue, mathematical modeling, kinematic hardening, complex loading, damage, finite element analysis

For citation: Nikitaev I. V., Volskiy P. N. Adaptation of the high-cycle fatigue model for assessing the service life of metal structures of floating cranes. Omsk Scientific Bulletin. Series Aviation-Rocket and Power Engineering. 2026;10(2):49–56. https://doi.org/10.25206/2588-0373-2026-10-2-49-56. EDN: WUWAAQ. (In Russ.).

Yu. A. Anisimov, A. G. Mikhaylov
Mathematical modeling of heat transfer processes in elliptical and circular absorbers of the vacuum tube collector
DOI: https://doi.org/10.25206/2588-0373-2026-10-2-57-67
The paper presents numerical findings from a mathematical research of heat transfer processes in evacuated tube solar collectors featuring circular and elliptical absorber profiles. The primary aim is to conduct a comparative performance analysis of these two geometries and to evaluate the potential for heat transfer enhancement when replacing the conventional circular cross-section with an elliptical one. The research employs a steady-state one-dimensional thermal model grounded in the energy balance equation. The model incorporates radiative exchange between the absorber and the glass envelope, heat conduction through the rarefied gas within the vacuum annulus, internal convection within the heat-transfer fluid channel and convective losses from the outer glass surface to the ambient air. The authors calculate temperature distributions at key system nodes and determine heat flux densities for all balance components — including the collector's useful thermal output. Moreover, the article demonstrates the comparison under identical boundary conditions for two distinct climatic scenarios: cold and warm seasons, representative of the temperate continental climate of the Omsk region. The results reveal that the elliptical absorber reduces radiative losses up to 17.8 % and residualgas conduction losses up to 16.7 %, while boosting the useful thermal power as much as 0.8 %. The thermohydraulic efficiency coefficient reaches to 4.8 %, confirming enhanced heat transfer performance with the modified geometry. The research substantiates a design-based approach for improving the energy efficiency of evacuated tube solar collectors. Therefore, this approach can be recommended for integration into the development of next-generation solar thermal systems.

Keywords: vacuum tube solar collectors, heat balance, numerical modeling, absorber, elliptical crosssection, heat transfer enhancement, energy efficiency

For citation: Anisimov Yu. A., Mikhaylov A. G. Mathematical modeling of heat transfer processes in elliptical and circular absorbers of the vacuum tube collector. Omsk Scientific Bulletin. Series Aviation-Rocket and Power Engineering. 2026;10(2):57–67. https://doi.org/10.25206/2588-0373-2026-10-2-57-67. EDN: VHHLSG. (In Russ.).

The research examines the issue of the influence of instrument features on the result of optimising its configuration in spacecraft compartments. For this purpose, specific features of the devices have been identified, the control of which can provide a more efficient way to develop and improve the configuration of such devices. The article defines a model for evaluating the effect of device features on the result of optimising their configuration. Further, the author considers the methods of optimal correlation of instrument features and develops a conceptual scheme of this process, consisting of the following stages: setting general requirements for body shapes and spatial orientation of instruments; applying methods of integration and aggregation; ensuring the applicability of instruments for universal space platforms. The author also conducts a test optimisation of the device configuration according to the criterion of minimum total mass. As a result, the greatest effect is achieved by performing all these steps, and the implementation of each of them reduces the mass of the on-board cable network, the mass of the device mounting structure, the mass of temperature control, the mass of protection of devices from electromagnetic interference and ionising radiation.  

K. V. Krivun, A. A. Pescherova, A. A. Lazareva
Numerical and experimental research of the stress-strain state of detachable joints of rocket engines
DOI: https://doi.org/10.25206/2588-0373-2026-10-2-76-85
The paper investigates the stress-strain state of critical detachable joints (keyed and threaded) in solid-propellant rocket motors. The purpose of the research is to study the stress-strain state of critical components in rocket technology (using the example of threaded and keyed joints) based on a comparative analysis of the results of numerical modeling in ANSYS and field experiments using photoelasticity. The authors propose a comprehensive approach to ensure high reliability, combining finite element modeling in ANSYS with experimental validation via the photoelastic method. The scientific novelty of the research consists in acquiring more accurate data regarding the stress state of the components under study by introducing a "virtual photoelasticity" algorithm for direct quantitative validation of numerical results. Furthermore, 3D-printing is utilized as an efficient technological tool for the manufacturing of optical models. Critical stress concentrators are identified in thread roots and keyway corners. Results demonstrate high convergence between numerical and physical experiments (the relative error is 0.57 % for the threaded connection and 3.4 % for the keyed connection), confirming the accuracy of the calculation models. The practical significance of the work is that the tested methodology can be used both in the early stages of design and for the strength optimization of the existing structures geometry.

Keywords: stress-strain state, finite element method, photoelasticity, detachable joints, solid propellant rocket engine, stress concentration, interference fringes, additive technologies

For citation: Krivun K. V., Pescherova A. A., Lazareva A. A. Numerical and experimental research of the stress-strain state of detachable joints of rocket engines. Omsk Scientific Bulletin. Series AviationRocket and Power Engineering. 2026;10(2):76–85. https://doi.org/10.25206/2588-0373-2026-10-2-76- 85. EDN: LDEEZN. (In Russ.).

V. R. Edigarov, B. Sh. Alimbaeva
Research of thermomechanical processes in the surface layer of steel parts after strengthening electromechanical processing
DOI: https://doi.org/10.25206/2588-0373-2026-10-2-86-95
This article presents the results of theoretical and experimental studies of the surface layers of parts made of structural steels after electromechanical hardening. The authors show that electromechanical hardening is characterized by the simultaneous presence of heterogeneous structures, non-uniformly distributed in the surface layer of the part, formed by varying intensities of thermomechanical action. The extremely short thermal exposure time of the surface layer during electromechanical hardening does not facilitate complete dissolution of cementite and the formation of a homogeneous γ-solution, which can lead to incomplete hardening with cementite inclusions. During electromechanical hardening, due to high-speed heating and cooling, a fine-grained martensitic structure is formed in a thin surface layer, as well as the thinnest non-etchable (by conventional methods) light zone with a depth of up to 0.1 mm. The light zone and the base metal have a distinct boundary, indicating a significant difference in the nature of these structures. Therefore, the research proves that significantly lower internal residual stresses present in the treated surface layer after surface electromechanical processing, which is confirmed experimentally. In this case, stresses of the first kind were considered in the study. Moreover, individual micro-volumes of the surface layer of local tracks can be tempered and contribute to obtain a heterogeneous structure in the treated layer. 

Keywords: electromechanical hardening, surface layer, thermomechanical action, high-temperature field, structural-phase transformations, thermal conductivity, residual stresses 

For citation: Edigarov V. R., Alimbaeva B. Sh. Research of thermomechanical processes in the surface layer of steel parts after strengthening electromechanical processing. Omsk Scientific Bulletin. Series Aviation-Rocket and Power Engineering. 2026;10(2):86–95. https://doi.org/10.25206/2588-0373- 2026-10-2-86-95. EDN: XPSBUZ. (In Russ.).