Журнал “НТС” №2 2023 (47)

10 YEARS IN THE MARKET OF IMPORT-SUBSTITUTING PUMPING AND TECHNOLOGICAL EQUIPMENT

Gennady Mikhailovich Tsukanov, Oleg Nikolaevich Butuzov

Abstract. This article discusses the issue of pumping equipment import substitution. The structure of the domestic pump market is presented and the rationale for the need for our own production of import-substituting pumping equipment for strategic sectors of the national economy is given.

Keywords: import substitution, pumping equipment, reengineering.

EXPERIMENTAL STUDIES OF PROCESSES IN A CYLINDER WITH CRYOGENIC FILLING BASED ON A POWER PLANT

Dmitry Aleksandrovich Uglanov, Alexandra Borisovna Shimanova, Artem Andreevich Shimanov, Alexey Leonidovich Lopatin

Abstract. This article presents the results of cylinder with cryogenic filling experimental studies as part of a power plant. As a result of the experiment, the current values of the thermodynamic parameters of the liquid and gas phases in time were obtained during the regasification of the working fluid due to heat inflows from the environment and due to the internal electric heater, and the average deviations of the calculated values from the experiment were determined. At the second stage of the research, the engine-generator was tested as part of the power plant. Thus, the results of studies of a cylinder with cryogenic filling in the flow mode at various pressures at the inlet to the engine-generator are obtained and the errors of the determined values during the experiment are limited.

Keywords: cylinder with cryogenic filling, cryoproduct, nitrogen, power plant, engine-generator.

BRIEF OVERVIEW OF FEATURES AND SOLUTIONS PROBLEMS OF VIBRATION ACTIVITY OF POWER UNITS AND SYSTEMS BASED ON THEM

 Sergey Vladimirovich Yaroslavtsev, Sergey Alekseevich Povekvechnykh

Abstract. This article reviews the problems and features of power units vibration activity based on blade machines and systems. The purpose of the research is to generalize the results of the analysis of the vibration activity features during the operation of main oil pumps at the nominal operating mode to intermediate modes, as well as to identify the features that occur when changing design parameters. The conducted research has allowed us to expand the limits of traditional classical research methodology. This provision is based on the results of numerical and full-scale experiments studying the influence of structural changes in the stator group on the vibration state of the pump. The construction of 3D models and calculations of amplitude-frequency characteristics were carried out using Autodesk Inventor and ANSYS, that is, modern methods of computational fluid mechanics. The analysis of the influence of structural changes on the level of vibration activity was carried out on the basis of the original method developed by the author for the regular synthesis of predicted vibration spectra and the author’s criterion for assessing the level of vibration activity of the pump at the design stage. The tasks set in this article are partially covered within the limited scope of the conference materials collection. Keywords: centrifugal pump, vibration activity, numerical modeling.

HYDRODYNAMIC TECHNOLOGIES OF ACCELERATED EQUIVALENT TESTS

Vladimir Petrovich Pokazeev, Pavel Dmitrievich Rekadze

Abstract. The historical background of the methods and technologies for accelerated equivalent testing (AET) emergence is examined through the prism of the aviation industry development. Number of basic terms definitions for accelerated tests and a physical criterion for the adequacy of accelerated tests are given. The research results of the first All-Union Conference on accelerated testing methods, as well as the contribution of the Department of Automatic Systems of Power Plants and the «Unicon» Research Center to the development of AET technologies in the field of creating high-frequency and high-amplitude systems for generating flow oscillations, are analyzed and compiled. The essence of the technology of accelerated equivalent tests is revealed: the importance and ways of justifying the equivalence of loading modes, directions of intensification and main stages are shown. The features of fatigue resistance of structural materials at increased frequencies of loading cycles are considered. The possibilities, limitations, and stages of implementation of the accelerated equivalent testing technology developed at Samara University are described.

Keywords: hydrodynamic technologies, accelerated equivalent tests, physical modeling, pulsations, intensification, equivalence of loading modes, self-similarity of modes.

CENTRIFUGAL MULTISTAGE PUMP DESIGN WITH INCREASED STEEPNESS OF PRESSURE CURVE

 Oleg Aleksandrovich Ivanov, Sergey Yuryevich Shchutsky, Rodion Petrovich Kazantsev, Andrey Nikolaevich Agrinsky, Pavel Vladimirovich Pugachev, Andrey Eduardovich Duruncha

Abstract. This paper is devoted to the study of the increasing possibility of the steepness of the centrifugal multistage pump head curve. The possible ways of achieving the task are analyzed. The results of designing the flow passage are given and the results of three-dimensional hydrodynamic calculations of viscous fluid flow are presented. The steepness of the head curve, obtained from the results of the calculations performed, provides the parameters required by the technical specification. Keywords: centrifugal multistage pump, flow passage, steepness of head curve, specific speed, hydrodynamic calculations.

INCREASING THE ACCURACY OF WORM WHEELS MECHANICAL MACHINING

Olga Ivanovna Popova, Margarita Ivanovna Popova, Sergey Vladimirovich Safonov, Maxim Nikolaevich Davydov

Abstract. To improve the accuracy of machining worm wheels, a new design of the worm cutter is proposed. Due to a decrease in the working height of the tooth for the first, second and third passes, the length of the base of each tooth is reduced, which makes it possible, without reducing the strength of the tooth, to reduce the angular pitch of the teeth in the end section and form a larger number of rails on the same outer diameter of the worm cutter. An increase in the number of rails gives a greater number of profiling cuts, which makes it possible to increase the accuracy of processing, as well as reduce uneven cutting and dynamic loads. With the obtained rational parameters, a worm cutter was made with a divided allowance for processing, with which the worm wheels were cut.

Keywords: worm cutter, worm wheel, tool rail, machining, allowance separation.

DIAGNOSIS OF EMERGENCY CONDITIONS TURBOPUMP UNIT LPRE USING SWITCH TECHNOLOGY

Alexander Valentinovich Kretinin, Dmitry Valerievich Soldatov

Abstract. The obtained results demonstrate possibility of using an automatic approach to simulate functioning of liquid rocket engine (LPRE) assemblies for the purpose of using them in systems for automated analysis of the fire tests results of liquid rocket engines. The obvious advantage of the used approach is a high probability of detecting and localizing defects during the development of a designed liquid-propellant rocket engine or for determining the technical condition of a serial liquid-propellant rocket engine during control and sampling tests.

 Keywords: switch technology, finite state machines, diagnostics, liquid propellant rocket engine, TNA.

IMPROVING THE MANUFACTURABILITY OF COMBINED PROCESSING OF SOLID-CAST TURBINE CHANNELS

Andrey Yurievich Grymzin, Gennady Alekseevich Sukhochev, Maxim Nikolaevich Baulin

Abstract. The article presents information on a combined technological process that combines finishing and hardening treatment of the surfaces of inter-blade channels of solid cast turbines with second-order curvature of surfaces and radial twist. The new technological approach makes it possible increase the manufacturability of processing and obtain the specified quality parameters.

Keywords: increasing manufacturability, combined processing, vibro-percussion processing, shot blasting.

NUMERICAL STUDY OF THE IMPELLER BLADE SHAPE INFLUENCE OF A CENTRIFUGAL PUMP ON PRESSURE PULSATION

Sergey Georgievich Valyukhov, Dmitry Nikolaevich Galdin, Elena Mikhailovna Obolonskaya, Yuri Alexandrovich Fofonov

Abstract. This article presents the results of a numerical study of the impeller blades shape influence of the centrifugal pump on the amplitude of pressure pulsations in the flow part of the centrifugal pump, the radial force acting on the rotor, as well as the integral energy parameters of the pump. To achieve this object, several versions of impellers were designed with complete preservation of the meridional section and all basic geometric dimensions. Only the lengths of the blades were changed due to reshaping and adjusting the shape. Hydrodynamic calculations were carried out using the CFD-method. The calculation results are presented in the most visual graphic form. Based on the data obtained, conclusions were drawn about the influence of blade length on pulsations and the values of the parameters under consideration.

Keywords: centrifugal pump, blade shape, pressure pulsation.

SIMULATION OF POROUS BODY FILTRATION PROPERTIES AS COMPOSITION OF A LIQUID COOLING PUMPING SYSTEM

Alexander Valentinovich Kretinin, Ekaterina Evgenievna Spitsyna

Abstract. The paper presents models and calculation methods for determining the filtration properties of a porous body used as a compact microchannel heat exchanger as part of a pump liquid cooling system. An analysis of the conditions for the applicability of porosity prediction based on clearance values in several sections of a porous body model is presented. A method for numerical calculation of coolant flow in pore channels using ANSYS WorkBench tools is presented. A factorial neural network dependence of the permeability coefficient on the porosity coefficient was constructed for the model of a microchannel heat exchanger.

Keywords: numerical modeling, liquid cooling, porous body.

INFLUENCE OF GEOMETRIC PARAMETERS OF A LOW-SPEED IMPELLER ON THE SHAPE OF THE CENTRIFUGAL PUMP PRESSURE CHARACTERISTIC

Artur Vlyatovich Oganesyan, Anastasia Anatolyevna Lapshova

Abstract. This article is devoted to the study of the influence of the low-speed pump impeller geometric parameters with a low speed coefficient (ns) on the shape of the pressure characteristic using numerical modeling by the finite element method and physical experiment. Design calculations and profiling of two experimental low-speed impellers were carried out taking into account the accepted limitations. Analysis of the numerical experiment results using the finite element method showed high convergence for engineering practice. Using this approach will make it possible to make an optimal design with increasing efficiency of its operational characteristics.

Keywords: pressure characteristic, low-speed impeller, geometric parameters, hydraulic calculation, hydraulic tests.