The influence of the engine cylinder head design on the gas dynamics and heat transfer of stationary gas flows in the intake system


Аuthors

Plotnikov L. V.1*, Grigoriev N. I.2**, Shurupov V. A.1***, Fayzullin M. Z.2

1. Ural Federal University named after the first President of Russia B.N. Yeltsin, 19, Mira str., Ekaterinburg, 620002, Russia
2. Institute of Thermal Physics of the Ural Branch of the Russian Academy of Sciences , Amundsena St., 107a Ekaterinburg, 620016, Russia

*e-mail: leonplot@mail.ru
**e-mail: noelll@bk.ru
***e-mail: shurupov.vladislav@yandex.ru

Abstract

The demand for piston engines (ICE) remains high in various spheres of human activity. Therefore, improving the design and operating cycle of ICE is an urgent task. Improving the quality of the intake process (filling the cylinder with air) by upgrading the design of the cylinder head is a highly effective way to improve the output indicators of ICE. A brief overview of the current state of research in this area is presented in the article. The article considers the influence of different cylinder head designs on the gas-dynamic and heat exchange characteristics of air flows in the intake system of the ICE model. The cylinder head was modernized by profiling the intake channel and profiling the intake valve plate (changing the shape from a circle to a square). Experimental studies were carried out under stationary conditions for a fully open intake valve. The article contains a description of the experimental setup and boundary conditions. The experiments covered a change in velocity in the intake pipe from 4 to 45 m/s. The experiments were carried out at atmospheric pressure and an air temperature of about 22 °C. The thermal anemometry method based on constant temperature anemometers was used to obtain data on gas dynamics and heat transfer in the intake system. It was found that the use of modernized cylinder heads causes an increase in the flow turbulence intensity in the intake pipe by an average of 13,5 %. At the same time, it was found that the increase in the intensity of flow turbulence in the cy-linder is about 19 % when installing new cylinder head designs. It is shown that there is an increase in the heat transfer coefficient in the intake pipe by 10–40 % when installing modernized cylinder heads in the intake system. The article discusses the applied issues of increasing the turbulence intensity (improving the quality of mixing fuel and air) and intensifying heat transfer (increasing the density of the working fluid) of the air flow in the intake system as applied to ICEs. The article also discusses further directions of research in this scientific and technical area.

Keywords:

piston engine, cylinder head, profiled channel, profiled valve, stationary air flow, turbulence intensity, heat transfer intensity

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