Thermal and mechanical characteristics of stationary and pulsating gas flows along the length of the exhaust system of a piston engine


Аuthors

Plotnikov L. V.*, Grigoriev N. I.**, Osipov L. E.***, Slednev V. A.****, Shurupov V. A.*****

Ural Federal University named after the first President of Russia B.N. Yeltsin, 19, Mira str., Ekaterinburg, 620002, Russia

*e-mail: leonplot@mail.ru
**e-mail: noelll@bk.ru
***e-mail: klumbaa@outlook.com
****e-mail: Vovik_super_45@mail.ru
*****e-mail: shurupov.vladislav@yandex.ru

Abstract

Obtaining new information on the thermal-mechanical characteristics of stationary and pulsating gas flows in the exhaust system is an up-to-date task in the field of thermo-physics and piston engine building. The article deals with the physical specifics of gas dynamics and heat transfer of flows along the length of the exhaust system of a piston engine. Experimental testbenches and techniques for experiments conducting are described. The authors propose an indirect method for determining the local heat transfer coefficient of gas flows in pipelines using a hot-wire anemometer of constant temperature. The patterns of both the flow rate and the local heat transfer coefficient changing in time for stationary and pulsating gas flows in various elements of the exhaust system were obtained. The patterns of the turbulence intensity change in the stationary and pulsating gas flow along the length of the exhaust system of a piston engine were established. The turbulence intensity for a pulsating gas flow is revealed to be 1.3–2.1 times greater than that for a stationary flow. The heat transfer coefficient changing patterns along the length of the exhaust system for stationary and pulsating gas flows were determined. It was elucidated that the heat transfer coefficient for a stationary flow is 1.05–1.4 times higher than the one for a pulsating flow. Empirical equations for the heat transfer coefficient determining along the length of the exhaust system for stationary and pulsating gas flow regimes were obtained. Possible trends of practical application of the obtained research results are described.

Keywords:

piston engine, exhaust system, gas flows, non-stationarity, gas dynamics and heat transfer, degree of turbulence, empirical equations

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