Physical and numerical simulation of the thermal and mechanical characteristics of stationary flows in the gasair paths of piston engines

Plotnikov, L. V.; Бродов, Ю. М.; Жилкин, Б. П.; Неволин, А. М.; Misnik, M. O.

doi:10.30724/1998-9903-2019-21-5-22-28

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…Известно, что форма поперечного сечения трубопроводов оказывает существенное влияние на структуру потока в них [2,28,29]. Поэтому в данном исследовании воздух поступал в вертикальный диффузор через подающие трубки, имеющие разные формы поперечного сечения (рис.…”

Section: материалы и методы (Materials and Methods)unclassified

Physical simulation of aerodynamic flow characteristics in a vertical diffuser with air supply through different pipe configurations

Plotnikov,

Ryzhkov,

Medvedev

et al. 2023

«Izvestiya vysshikh uchebnykh zavedenii. PROBLEMY ENERGETIKI»

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RELEVANCE. Vertical cone diffusers are used in various technical applications: heat exchangers, gas cleaning units, boilers, industrial furnaces, dryers, ventilation devices, nozzle systems and others. For their efficient operation, it is necessary to ensure a uniform supply of the working medium to the device, which is determined by the characteristics of the flow in thediffuser. Thus, the study of the aerodynamics of technological devices with conical diffusers is an urgent task for gas-dynamic improvement and the search for ways to control flow characteristics. THE PURPOSE. To establish the evolution of the velocity field along the height of the cylindrical part of the diffuser for different configurations of the supply tubes, and also to determine the magnitude of the change in the intensity of turbulence along the height of the diffuser under different initial conditions based on experimental data on the instantaneous values of the air flow velocity. METHODS. Measurement of instantaneous values of air flow velocity is carried out using a constant temperature hot-wire anemometer. The article provides data on velocity fields and turbulence intensity along the height and along the diameter of the cylindrical part of the diffuser when air is supplied through tubes of different configurations. Feed tubes with cross sections in the form of a circle, a square and an equilateral triangle were used. RESULTS. The article provides a detailed description of the experimental stand (including key geometric dimensions), instrumentation and measurement system, and data processing techniques. The ranges of changes in the initial conditions for the experiments are presented. A comparison of the aeromechanical characteristics of flows in a vertical diffuser when air issupplied through different tube configurations is carried out. CONCLUSION. It is shown that in the diffuser there is a drop in the average velocity upstream, which is typical for all configurations of the supply tubes. It has been established that profiled tubes influence the shape of the velocity field. It was found that the values of turbulence intensity vary from 0.05 to 0.39 (the highest values were typical when air was supplied through profiled tubes). It is shown that the intensity of turbulence has its maximum values at a height of 300-350 mm, which is typical for all investigated tube configurations.

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Section: материалы и методы (Materials and Methods)unclassified

Physical simulation of aerodynamic flow characteristics in a vertical diffuser with air supply through different pipe configurations

Plotnikov,

Ryzhkov,

Medvedev

et al. 2023

«Izvestiya vysshikh uchebnykh zavedenii. PROBLEMY ENERGETIKI»

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“…Существует научное направление по доводке конструкции выпускной системы с целью улучшения эксплуатационных характеристик ПДВС [12][13][14][15][16]. Jang J. и др.…”

Section: введение (Introduction)unclassified

Stationary thermal-gas-dynamics of flows in the cylinder and exhaust system of a piston engine

Plotnikov

Shurupov

Slednev

et al. 2023

«Izvestiya vysshikh uchebnykh zavedenii. PROBLEMY ENERGETIKI»

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THE PURPOSE. To evaluate the influence of the exhaust manifold design on gas dynamics and heat transfer of stationary, turbulent gas flows in the cylinder and the exhaust system of a reciprocating internal combustion engine for different boundary conditions based on physical and mathematical modeling.METHODS. The study of gas dynamics and heat transfer of flows was carried out using the CFD approach in specialized Russian-made software. The simulation was performed for a pressure drop from 0.15 to 40 kPa (the flow velocity at the outlet of the system was 10-130 m/s). The k-e turbulence model was used for modeling. The computational grid consisted of 610,000 cells. The design change consisted in the use of profiled channels with cross sections in the form of a circle (diameter 30 mm), a square (side 30 mm) and a triangle (side 52 mm).RESULTS. The article describes the mathematical model, the studied geometry of the exhaust system and the analysis of the obtained data. The velocity field, isolines of equal velocities, and tangential velocity vectors were chosen as the gas-dynamic characteristics of the flow. The gas dynamics in the longitudinal section of the exhaust system and the valve, as well as the visualization of the flow structure in 4 control sections along the length of the exhaust system, were analyzed. The heat transfer coefficient in the exhaust system was used to evaluate the heat transfer characteristics of the flow. Qualitative and quantitative differences in gas dynamics and heat transfer processes are shown.CONCLUSION. It has been established that there are common gas-dynamic effects during the flow of gas in different elements of the exhaust system. The evolution of the flow structure along the length of the exhaust system is shown based on the change in the velocity field, isolines of equal velocities, and tangential velocity vectors. The vortex structures formed in the valve assembly and the corners of the profiled channels are revealed. It has been established that the use of profiled channels in the exhaust system leads to a decrease in the heat transfer coefficient by 5 to 12%.

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Physical and numerical simulation of the thermal and mechanical characteristics of stationary flows in the gasair paths of piston engines

Cited by 2 publications

References 11 publications

Physical simulation of aerodynamic flow characteristics in a vertical diffuser with air supply through different pipe configurations

Physical simulation of aerodynamic flow characteristics in a vertical diffuser with air supply through different pipe configurations

Stationary thermal-gas-dynamics of flows in the cylinder and exhaust system of a piston engine

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