Журнал “НТС” №3 2022 (44)

PCVEXPO’2022 — POSITIVE ATTITUDE!

Evgenii Vladimirovich Solodchenkov

Abstract. In the society of manufacturers and consumers of pumping equipment, over the past 20 years, the last week of October is traditionally associated with the international exhibition P CVEXPO. This article provides a brief description of the past exhibition.

Keywords: pump manufacturing, centrifugal pumps, PCVEXPO.

RESEARCH OF THE OPERATION OF PUMP 2 NPS 65/35-500

WITHIN THE FRAMEWORK OF THE TECHNOLOGICAL SCHEME OF OPERATION WHEN PUMPING UNSTABLE GAS CONDENSATE

Aleksey Valerievich Biryukov

Abstract. The report presents a description of the research work carried out directly at the operation site when pumping unstable gas condensate, provides recommendations on the design features of the installation elements in order to optimize the operation of pump.

Keywords: pump, equipment for pumping gas condensate, hydraulic calculations, valves, design, commissioning.

IMPROVING THE EFFECTIVENESS OF THE STRIKE UNMANNED AERIAL VEHICLE

Yurij Vladimirovich Zinenkov, Aleksandr Valerevich Lukovnikov, Sergej Vladimirovich Agaverdyyev

Abstract. Increasing the efficiency of an aircraft at different stages of its life cycle can be achieved by optimizing the parameters of its power plant, according to the criteria of the aircraft level. In this paper, such problem has been solved for the conceptual design of an attack unmanned aerial vehicle. At the same time, the methodology and software tool developed by the authors for conducting computational and theoretical studies in conjunction with the well-known method of indirect statistical optimization based on self-organization were used. Optimization studies were carried out according to criteria, as which the technical parameters of the maximum range according to the formed flight programs were adopted.

Keywords: unmanned aerial vehicle, flight task, aerodynamic characteristics, parametric studies, degree of two-circuit, take-off thrust, Pareto set.

AXIAL PISTON HYDRAULIC MACHINE WITH TWO PUMPING UNITS AND GEAR DRIVE OF CYLINDER BLOCKS

Anatolii Ivanovich Nizhegorodov

Abstract. The article considers the possibility of improving the already known axial-piston hydraulic machines with two pumping units. The new design of such hydraulic machines contains cylinder blocks that rotate through bevel gears from a common shaft. This implementation of their drive allows, due to shortened pistons, 1.5 … 2 in length from their diameters, to increase the angle of inclination of the blocks up to 40° and increase the working volume of the hydraulic machine by about 45 %, compared with the analog, with virtually no increase in overall dimensions. A feature of the blocks themselves is the use of intercylinder zones of the main cylinders to accommodate additional working chambers with pistons of a smaller diameter, which increases the working volume by another 33 % with an increase in the diameter of the blocks by 10 %. Such optimization of blocks and pumping units as a whole significantly increases the working volume of the hydraulic machine, specific power and reduces pulsation.

Keywords: axial-piston two-row machine, working volume, high throttle response, increased power, high-torque hydraulic motor, low flow rate and shaft speed pulsation.

ANALYSIS OF LOADS ON SUPPORTS UNDER VIBROIMPACT LOADING OF THE ROTOR

Andrei Vladimirovich Ivanov

Abstract. The article considers the influence of vibro-impact loading modes that occur during transient processes during engine operation, primarily starting and stopping, separation of stages of launch vehicles. It is shown that the loads caused by such modes can reach significant values and should be taken into account when designing the rotor supports.

Keywords: liquid rocket engine, turbopump units, supports.

TOPICS OF PRACTICAL WORKS AND COURSE DESIGN FOR THE SPECIALTY «ENGINEERING TECHNOLOGY» IN CONNECTION WITH ADAPTATION OF YOUNG SPECIALISTS

Evgeny Vladimirovich Pachevsky, Elena Nikolaevna Pachevskaya

Abstract. Some aspects of solving the problems of adaptation in the workplace of young specialists — graduates of technical educational institutions are considered. The topics of practical and laboratory work, as well as course and diploma design, should take into account the realities of the production process and modern trends in the development of mechanical engineering.

Keywords: course design, technological processes, serial production, universal prefabricated devices, adaptation of young specialists.

IDENTIFICATION OF THE RHEOLOGICAL CHARACTERISTICS OF OIL-CONTAINING MEDIA DURING THEIR FILTRATION THROUGH NATURALLY POROUS MEDIA

Victor Ivanovich Ryazhskikh, Oksana Valerievna Kulikova, Ekaterina Evgenievna Spitsyna

Abstract. The article studies the methods of collecting oil from formed oil spills during its extraction, taking into account the rheological properties of oil with changing thermodynamic characteristics of the environment, attention is paid separately to determining the rheological properties of oil when filtering it in soils of various origins.

Keywords: oil, rheological properties, viscosity, soils.

NATURE-LIKE TECHNOLOGIES IN HYDRAULIC MACHINERY CONSTRUCTION. IMITATION THE HYDRODYNAMIC EFFECT OF SHARK SKIN

German Aleksandrovich Kromm, Alexander Viktorovich Volkov, Alexey Anatolyevich Druzhinin, Vitalina Vladimirovna Zhuravleva

Abstract. One of the promising areas for improving hydraulic machines, in particular turbines, isto increase their energy efficiency through the use of new design approaches based on the principles of biomimetics. Interest in this area is due to the fact that traditional design methods do not always allow achieving high efficiency in a wide range of operating modes of a hydraulic unit. In this paper, the first part of the research is presented, the purpose of which is to study a nature-like technology based on the «shark skin» effect to increase the efficiency of hydraulic turbines. This effect makes it possible to significantly reduce the drag during flow, since the geometry of shark skin flakes radically changes the pressure distribution over the surface and increases the size of the boundary layer, reducing friction losses. The first results have been obtained, which make it possible to reduce energy losses by up to 22 % when flowing around a plate. Also, the data obtained in the software packages of computational fluid dynamics were verified with the results of a physical experiment carried out using the hydraulic equipment of NRU «MPEI» with the support of a grant from PNI «Energetika».

Keywords: biomimetic, nature-like technology, energy efficiency, hydraulic machinery construction, centrifugal pump, hydraulic turbine, plate, airfoil, computational fluid dynamics, physics experiment, additive technologies.

OPTIMIZATION OF THE FLOWING PART OF THE OD-11 AXLE PUMP

Dmitrii Gennadevich Svoboda, Aleksandr Arkadevich Zharkovskii, Igor Olegovich Borshchev, Evgenii Aleksandrovich Ivanov, Arsentii Sergeevich Kluev

Abstract. Digital methods of extremum search based on algorithms of DesignXplorer optimization tool, which is a composite module of Ansys Workbench software package, are considered in the paper. Methods based on Response Surface Optimization (RSO) and direct optimization methods are tested. The use of the proposed methodology allowed to obtain a more efficient flow part of the OD-11 axial pump.

Keywords: axial pump, optimization, optimization criteria, direct methods, response surface, digital researches.

TECHNOLOGY OF HARDENING OF THE BLADE PARTS CAVITIES BY COMBINED PROCESSING

Denis Vasilievich Silaev, Gennady Alekseevich Sukhochev, Sergey Nikolaevich Kodentsev

Abstract. The work is devoted to the analysis of the surface technology of a complex profile of blade parts for the plasma spraying of protective coatings, the results of theoretical and experimental investigations, the proposed technological methods and means for combined action on the surface layer of the material of the component are presented.

Keywords: combined treatment, activation, blade part, micro-granules, micro-protrusions, conductive medium, anodic dissolution.

COMPARISON OF SOFTWARE PRODUCTS FOR CFD ANALYSIS ON THE EXAMPLE OF CALCULATION OF THE CENTRIFUGAL CONSOLE PUMP

Stanislav Viktorovich Akimov

Abstract. The article presents the results of hydrodynamic calculations of fluid flow in a centrifugal cantilever pump, obtained in three software products — ANSYS CFX, FloEFD and FlowVision. The calculated pressure and energy characteristics are compared with experimental data. It is shown, that the accuracy of the results obtained in the Russian software product FlowVision is comparable to the accuracy of ANSYS CFX and better matches the experimental results compared to FloEFD.

Keywords: pump, head characteristic, energy characteristic, computational fluid dynamics.

THE USE OF CONJUGATE CALCULATION METHODS FOR ASSESSING THE VIBRATION ACTIVITY OF PUMPS

Sergey Vladimirovich Ogurtsov, Konstantin Gennadievich Mikheev, Viktor Vasilievich Pushkarev

Abstract. The report discusses the main approaches to the conjugate numerical simulation of physical processes in order to predict the vibration and noise characteristics of pumps. The main sources of pump vibration are described. The suitability of the existing turbulence modeling methods for carrying out conjugate calculations is given. The results of measurements of hydrodynamic noise are compared with the calculated characteristics. The results of coupled simulation of the dynamics of the rotor of a centrifugal pump and hydrodynamic bearings are considered, and an assessment is made of the influence of the shaft geometry on the vibration activity.

Keywords: computational fluid dynamics, turbulence model, vibration activity.