Influence of Intake/Exhaust Channel Lateral Profiling on Thermomechanics of Pulsating Flows

Brodov, Yu. M.; Жилкин, Б. П.; Plotnikov, L. V.

doi:10.1134/s1063784218030039

Cited by 14 publications

(6 citation statements)

References 6 publications

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“…The effect of the pipe cross section on the heat transfer intensity can be explained by the formation of vortex structures in the corners of such channels [20]. These vortex structures significantly change the gas dynamics of the flow and the conditions for the formation of the boundary layer, and, accordingly, the heat transfer intensity between the flow and the pipe walls [21]. Consequently, further research is needed to study the effect of the flow turbulence level and the cross-section shape of pipes on the heat transfer intensity.…”

Section: Description Of the Main Scientific And Technical Resultsmentioning

confidence: 99%

Computational and experimental evaluation of heat transfer intensity in channels of complex configuration for gas flow with different levels of turbulence

Plotnikov

Жилкин

Brodov

et al. 2021

J. Phys.: Conf. Ser.

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Disclosure of the physical mechanism of the influence of the turbulence intensity of gas flows on the heat transfer level in pipes of different configurations is an urgent task in the field of heat and power engineering. A brief overview of the literature on this topic is given in the article. A description of the boundary conditions for modeling is presented. The main characteristics of the experimental stand and measuring instruments are described. The purpose of this study is to study the effect of the initial turbulence level of a stationary gas flow on the heat transfer intensity in long pipes with different cross sections. The study is carried out using numerical simulation. The simulation results are qualitatively confirmed using experimental data. The values of the local heat transfer coefficient are shown to increase from 5 to 17% with increasing turbulence intensity (from 2 to 10%) in pipes with different cross sections. The heat transfer intensity in a triangular pipe is found to increase up to 30% compared to a round pipe. It is revealed that there is an up to 15% suppression of heat transfer in a square pipe compared to a round pipe. The data obtained may be useful for the design of flow paths and gas exchange systems for power machines and installations.

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Section: Description Of the Main Scientific And Technical Resultsmentioning

confidence: 99%

Computational and experimental evaluation of heat transfer intensity in channels of complex configuration for gas flow with different levels of turbulence

Plotnikov

Жилкин

Brodov

et al. 2021

J. Phys.: Conf. Ser.

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“…In this case, the maximum reduction in the heat transfer coefficient reaches 33% in comparison with the exhaust system of a constant circular cross section. It is noteworthy that a decrease in the α х was also observed in the study of local heat transfer in the exhaust system under conditions of gas-dynamic nonstationarity (pulsating flows) at all crankshaft speeds [13,14].…”

Section: Experimental Data On Heat Transfer In the Exhaust Systemmentioning

confidence: 92%

Numerical and physical modeling of heat transfer in the exhaust system of a piston engine in stationary conditions

2019

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Thermomechanical perfection of exhaust systems largely determines the efficiency of the engine boost system. The article presents the results of numerical simulation and experimental study of heat transfer of gas flows in profiled exhaust systems of ICE. The description of the numerical simulation technique, the experimental setup, the configurations of the hydraulic systems under investigation, the instrumentation and the experimental features are given in the article. On the basis of numerical simulation, it has been established that the use of profiled sections with a cross-section in the form of a square in the exhaust system of an ICE leads to a decrease in the heat transfer rate to 5 %. The use of profiled sections in the form of a triangle in the system under consideration causes a more significant decrease in heat transfer, which reaches 11 %. Experimental studies qualitatively confirm the results of simulation.

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“…The cross-sectional shape of pipelines has a significant effect on the structure of the flow in them [2,28,29]. Therefore, in this study, air entered the vertical diffuser through supply tubes with various cross-sectional shapes (Figure 2).…”

Section: Description Of the Experimental Measurement Facilitymentioning

confidence: 99%

Mathematical Description of the Aerodynamic Characteristics of Stationary Flows in a Vertical Conical Diffuser When Air Is Supplied through Various Tube Configurations

Plotnikov

2023

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Conical diffusers of various configurations are used in many kinds of technical equipment and manufacturing processes. Therefore, it is a relevant objective to obtain reliable experimental and mathematical data on the aerodynamic characteristics of diffusers. This article presents experimental data on the aerodynamics of stationary flows in a vertical conical diffuser when air is supplied through tubes with various cross sections (circle, square, and triangle). Instantaneous values of air flow velocity are measured with a constant-temperature hot-wire anemometer. Data are obtained on the velocity fields and turbulence intensity along the height and the diameter of the diffuser’s cylindrical part when air is supplied through tubes of various configurations. It is established that air supply through profiled tubes has a significant effect on the shape of the velocity field and turbulence intensity in a vertical conical diffuser. For example, higher values of turbulence intensity are typical of air supplied through profiled tubes (the differences reach 50%). A mathematical formulation (linear and exponential equations) of the change in the average speed and intensity of air flow turbulence along the height of the diffuser’s cylindrical part for various initial conditions and supply tube configurations is presented. The obtained findings will make it possible to refine mathematical models and update algorithms for engineering the design of diffusers for various engineering processes and pieces of technical equipment.

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Influence of Intake/Exhaust Channel Lateral Profiling on Thermomechanics of Pulsating Flows

Cited by 14 publications

References 6 publications

Computational and experimental evaluation of heat transfer intensity in channels of complex configuration for gas flow with different levels of turbulence

Computational and experimental evaluation of heat transfer intensity in channels of complex configuration for gas flow with different levels of turbulence

Numerical and physical modeling of heat transfer in the exhaust system of a piston engine in stationary conditions

Mathematical Description of the Aerodynamic Characteristics of Stationary Flows in a Vertical Conical Diffuser When Air Is Supplied through Various Tube Configurations

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