Vol. 9, no. 1, 2025
OMSK SCIENTIFIC BULLETIN. SERIES «AVIATION-ROCKET AND POWER ENGINEERING»
|
V. L. Yusha, S. S. Busarov Peculiarities of operating modes of booster piston compressors based on a low-speed long-stroke compressor stage in mobile compressor stations DOI: 10.25206/2588-0373-2025-9-1-5-13 The article considers the relationship between the increase in temperature at the standard suction point of a booster long-stroke low-speed piston compressor stage and the change in the state parameters in the working cavity of the cylinder and its integral characteristics. The parametric analysis is performed using a proven and verified mathematical model of the actual working processes of the stage in question. Based on the results of the conducted calculation and theoretical analysis, the fundamental possibility of implementing operating modes in which the average discharge temperature of a given stage is lower than the temperature at its standard suction point is proven. At the same time, with regard to the suction conditions in a given stage, there is an increase in the delivery coefficient. The presented results reflect the features of the operating processes of the piston compressor stage under consideration and allow predicting the possibility of its effective use as a booster stage in mobile compressor stations. Keywords: booster piston compressor, low-speed long-stroke stage, operating processes, mathematical model, increased suction temperature, average discharge temperature, delivery coefficient, indicated efficiency, mobile compressor station. |
5–13 |
|
N. V. Sokolov, M. B. Khadiev, P. E. Fedotov, E. M. Fedotov Transient operating modes of fluid film thrust bearing of a compressor machine DOI: 10.25206/2588-0373-2025-9-1-14-23 The article presents numerical studies of the effect of transient modes of operation of a fixed pad thrust bearing of a centrifugal or screw compressor. The change in the bearing capacity, maximum lubricant temperature and power losses with a change in the rotational speed of the rotor collar is investigated. A jump in the bearing capacity and power losses in the first seconds of acceleration of the collar and low viscosity of the lubricant at the feed temperature is detected. The change in the bearing capacity of the thrust bearing with simultaneous rotor runout and continuous surge of the centrifugal compressor is studied. The occurrence of some vacuum on the working surface of the pad during stop and continued harmonic axial movement of the collar is noted. Keywords: compressor, thrust bearing, transient mode, surge, rotational speed, bearing capacity, maximum temperature, power losses. |
14–23 |
|
I. A. Yanvarev, V. S. Vinichenko, I. S. Bozhko Improving the efficiency of the resource-saving gas cooling system of the booster compressor unit as a part of the combined cycle plant DOI: 10.25206/2588-0373-2025-9-1-24-31 Versions of ways to increase efficiency of gas cooling system of booster four-stage centrifugal compressor unit used to provide fuel for required parameters of two gas-turbine plants as part of GTCC-90 combined- cycle plant are considered. The stages of solving the problem of resource saving of the cooling system with the traditional, passive and energy-saving approaches to its formation and the corresponding operating modes are reflected. Application area — combined cycle plants, natural gas compression facilities. Keywords: compressor unit, cooling system, heat exchange unit, evaporator, condenser, cooling agent, energy saving, increased efficiency. |
24–31 |
|
V. Yu Grokhotov, A. G. Mikhailov, I. A. Stepashkin Detection of heat carrier losses in centralized heating systems DOI: 10.25206/2588-0373-2025-9-1-32-36 Centralized heating systems are widely used for providing heat to residential, commercial, and industrial buildings. However, one of the significant challenges in these systems is the loss of heat carrier (usually water or steam), which can lead to inefficiencies, increased operational costs, and environmental impacts. Detecting and addressing these losses is crucial for maintaining the efficiency and reliability of the heating system. Keywords: heat supply systems, heat carrier leakage, heating networks, leak detection methods, pipeline networks, digitalization of heat supply, metering device data analysis, heating network failure rate. |
32–36 |
|
K. E. Denisov, A. K. Liamasov Movable blade systems of low specific speed centrifugal pumps DOI: 10.25206/2588-0373-2025-9-1-37-45 One of the most common types of pumping units used in industry are centrifugal pumps. In turn, there is a classification of centrifugal pumps according to design features. So-called low specific speed pumps are designed for low flow and high pressure. This type of pump is widely used in the chemical and oil industries due to its operating conditions, which involve overcoming the resistance of long technological pipelines. At the same time, low specific speed centrifugal pumps have low energy efficiency due to extensive vortex formation the moving fluid inside the flow area. In order to increase the energy efficiency of low specific speed pumps, a new approach to the design of the main operational entity of the centrifugal pumps. The identity of the approach lies in the use of a movable blade system in low specific speed centrifugal impellers. The geometry of their meridian projection, peculiar only to low specific speed impellers, has been adapted to the possibility of rotating each separate blade relative to its axis of rotation. The mobility of the blades will allow to influence the hydrodynamics not only in the impeller by changing the width of the inter-blade channel and the blade angles at the blades at the inlet and outlet, but also, as a result, in the volute, which will lead to greater coherence of their flow modes. Numerical calculations showed that the proposed approach is able to change the work characteristics of a centrifugal pump by reducing its power consumption over the entire operating range, which can be considered as an increase in the energy efficiency of the pumping unit. Keywords: centrifugal pump, impeller, blade system, centrifugal pump regulation, energy efficiency, hydrodynamics, numerical modelling, optimization of the flow part. |
37–45 |
|
V. A. Nikitina, A. B. Sulin, S. S. Muraveinikov, D. O. Dmitriev Multi-criteria optimization of heat recovery unit in terms of the climatic factor DOI: 10.25206/2588-0373-2025-9-1-46-55 The use of heat pumps in exhaust air heat recovery systems is an effective energy-saving technology. Due to the increase in the number of refrigerants with different characteristics, a problem arises with making a decision on the use of a specific substance, taking into account the climatic features of a particular region. Multicriteria optimization methods adapted to solving this problem can be used taking into account the specified preferences for energy, environmental and economic factors. The TOPSIS method is used in this paper as one of the subtypes of the MADM multicriteria optimization method, which is adapted to solve the problem. The essence of the method is to find a Pareto-optimal alternative solution that is closest to the «ideal positive». The parameters of the heat pump unit are calculated in the EES program. The TOPSIS multicriteria optimization method is implemented as a computational procedure in the Excel environment. The working fluids R410A, R407C, R290, R134a and R1234yf are considered as alternatives. The climatic zones of the Russian Federation are represented by the cities of Saint Petersburg, Petrozavodsk, Sochi, Omsk, Krasnodar and Anadyr. The optimal alternative is selected taking into account the preferences specified by the weighting factors. The results of multicriteria optimization are presented as a function of the climatic factor of the HSDD, which allows them to be used for any locality. According to the optimization results, it is revealed that with an equal assessment of the significance for six cities of the Russian Federation, the refrigerant R1234yf has a rating higher than the others by 21 %–23 %. Optimization based on energy efficiency revealed significant advantages in refrigerants R410A and R134a with a difference of 2 %–11 %. For regions with a cold climate, it is more economical to use refrigerant R1234yf, while for regions with a moderate climate, the best option is R134a. Keywords: multicriterial optimization, heat pump, climatic factor, working fluid, heat recovery, TOPSIS, HSDD. |
46–55 |
|
Ya. E. Rodkin, A. B. Sulin Construction of a computational model for the process of cooling down a cryogenic storage facility for liquefied natural gas DOI: 10.25206/2588-0373-2025-9-1-56-63 As part of the preparation of the cryogenic storage facility for operation, the following processes are performed during commissioning: inerting — displacing air from the tank volume in order to exclude the possibility of forming an explosive mixture; substitution — replacing neutral gas (nitrogen) with methane; chilling — cooling the storage tank structure to a temperature of 143 K. Chilling allows to reduce the amount of regasified gas during loading and storage, eliminate the occurrence of low-temperature stresses in the structural elements, and reduce the likelihood of emergency situations during operation. This article presents a comparative analytical study of the process of two-phase and convective cooling of a cryogenic storage facility for liquefied natural gas. The Kantorovich–Bubnov–Galerkin method is used to model non-stationary heat exchange in the storage facility's insulating structure. This method allows to obtain approximate analytical solutions describing temperature fields and cooling dynamics. As part of the study, dependencies of the change in temperature pressure on the inner wall of the tank during cooling with methane and air over time are obtained, and graphs of isotherms in the gas space of the tank during convective cooling with air were constructed. Keywords: liquefied natural gas, cryogenic storageof liquefied natural gas, cooling, non-stationary heat exchange, convective heat exchange, analytical modeling. |
56–63 |
|
Tarraf Mohammad, V. V. Gayevskiy, Deeb Muhammad Modelling, controlling and regulating the energy consumption of a hybrid vehicle DOI: 10.25206/2588-0373-2025-9-1-64-71 The increasing scarcity and cost of fossil fuels, combined with the awareness of global warming issues, have led in recent years to the development of hybrid vehicles, which are now an industrial solution to reduce fuel consumption and thus CO2 emissions and pollutants. Against this background, a number of research programmes have recently been conducted on hybrid vehicle modelling to determine the optimal architecture, simulate energy behaviour and define energy management laws; hybrid vehicle design to validate components and theoretically defined energy management laws; and vehicle testing to verify vehicle performance under real-world conditions. This paper focuses on modelling and simulation of a hybrid vehicle with two energy sources: an internal combustion engine and an electric motor. A ‘series-parallel’ hybrid scheme is adopted for modelling, so each component is modelled separately. The vehicle model taken for modelling consists of a set of different component blocks by connecting them in a structured manner. A control strategy is developed to control the powertrain, the role of which is to sel ect at each instant of time the optimal power allocation between the different power sources in such a way as to minimize fuel consumption and emissions. Keywords: series-parallel hybrid vehicle, internal combustion engine, automotive battery, standard European driving cycle, energy management system, electric motor. |
64–71 |
|
A. V. Burakov, R. R. Khotsky, L. G. Kuznetsov Selection and study of methods for implementing a diagnostic model for compressor stations of the rocket and space complex DOI: 10.25206/2588-0373-2025-9-1-72-82 The article considers a compressed air system as an object of diagnosis, which is part of a complex of compressor equipment for the production, storage, and distribution of gases for spaceports providing launch vehicles. A model for diagnosing a reciprocating compressor as the main device for the production of compressed air is selected, based on the analysis of characteristic malfunctions. Vectors of the state of the elements of the compressed air system have been developed based on a variety of structural parameters characterizing the technical condition of the diagnostic object. It is proposed to use wavelet analysis to process the diagnostic parameters obtained by analyzing the indicator diagrams of the stages of a reciprocating compressor. Keywords: piston compressor, indicator diagram, diagnostic model, diagnostic parameters, technical diagnostics. |
72–82 |
|
K. I. Zharikov, I. S. Vavilov Numerical simulation of a rarefied gas jet emanating fr om an ion-optical system of the microthruster DOI: 10.25206/2588-0373-2025-9-1-83-91 A jet of ionized rarefied gas escaping from an ion-optical system of a prototype resonator RF-ion thruster into the surrounding space with low background pressure is considered. After a number of assumptions, the escaping jet is replaced in the first approximation by a neutral rarefied gas, which allows us to characterize the flow satisfying the hypothesis of flow continuity. The equations describing the motion of a continuous medium are solved numerically using the Bubnov–Galerkin method, which is used in rarefied gas dynamics. Non-stationary heat transfer is taken into account due to the interaction of the gas flow with a local heat release region in the gap between the grid elements of the ionoptical system. The heat release mechanism is described by the heat conduction equation, which is solved together with the gas dynamics equations. The obtained calculation results are compared with the experimental data. The conducted modeling made it possible to obtain the spatial structure of the neutral rarefied gas flow in the cylindrical channels and microchannels of the microthruster. By comparing the obtained spatial structure with the real thermal imaging picture of the jet, it is possible to estimate the contribution of the resonator acceleration to the total energy of the jet. Keywords: numerical simulation, rarefied gas, axisymmetric flow, heat release, jet, thermogram, flow structure. |
83–91 |
|
D. A. Zhuikov, Yu. N. Shevchenko, A. A. Kishkin, A. A. Zuev, M. G. Melkozerov, A. V. Delkov Research of viscous incompressible fluid flow in the lateral rotation cavity of centrifugal pumps and gas turbines of liquid rocket engines based on the spatial boundary layer theory DOI: 10.25206/2588-0373-2025-9-1-92-100 The flow of a viscous incompressible liquid in the lateral cavity of rotation of centrifugal pumps and gas turbines of liquid rocket engines is considered. Based on the theory of the spatial boundary layer, a system of equations has been developed to determine the coefficient of moment of resistance, which makes it possible to determine the mechanical (disk) losses and efficiency of the unit. The coefficient of the moment of resistance depends on the circumferential frictional stresses, which depend on the thickness of the spatial boundary layer, which for a limited cavity cannot develop indefinitely as with the longitudinal flow around the plate. The effect of the fusion of boundary layers on the wall and on the disk on the mechanical losses of the rotor is considered. Numerical data on the processing of various designs of aggregates are presented. Keywords: liquid rocket engines, turbopump units, rotational cavity, rotating disk, viscous flow, frictional stresses, moment of resistance, spatial boundary layer. |
92–100 |
|
E. V. Leun, S. A. Chalov Improving inertial separating penetrators considering the features of their impact penetration into the studied celestial bodies DOI: 10.25206/2588-0373-2025-9-1-101-112 The article considers factors that can negatively affect the creation of reliable radio communication between an inertial separating penetrator after its impact penetration into the soil of the studied celestial body and an orbital vehicle. The authors conduct the calculation and analysis of overloads acting to the forward head and antenna parts. Moreover, the research demonstrates that the overload on the antenna part can be dozens of times greater than on the forward head. The authors also present the calculation and analysis of the input diameters of the funnels formed from the impact penetration of the penetrator into different soils of the studied celestial body. The research considers possibilities of improving penetrators by using segmented, telescopic and hybrid tips, as well as reverse shooting of the antenna, which allow reducing the impact speed and overloads during impact penetration of the penetrator into the soil of the studied celestial body. Keywords: space research, celestial body, regolith, penetrator, impact penetration, segmented tip, telescopic tip, hybrid tip. |
101–112 |