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An Experimental Study on a Flowfield Characteristics in a Throttle Valve of SI Engine
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 Title & Authors
An Experimental Study on a Flowfield Characteristics in a Throttle Valve of SI Engine
Kim, Cheol; Kim, Seong-Cho; Choe, Jong-Geun; Lee, Seok-Jeong;
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 Abstract
Experimental investigations on the flow characteristics of downstream region of a butterfly valve, which is used in SI engine, have been conducted according to Reynolds number and valve angle. Measurement programs of the flowfield using x-type of hotwire anemometry include the mean and fluctuating velocity, turbulnet intensity, shear stress, power spectrum and pressure loss coefficient. Experimental results show that flow characteristics and independent of relatively high Reynolds number; 60,000 and 80,000. It is also seen that streamwise mean velocities have relatively large velocity gradient around the butterfly valve with increasing the valve opening angle and this trend appears even in the far downstream region. The distributions of turbulent intensity and shear stress show irregular behavior regardless of the valve opening angle and those of the case of the valve opening angle of 45°are the largest. The pressure loss coefficient of the body surface of the throttle valve increases mildly with the increase of Reynolds number and increases rapidly with the reduction of the valve opening angle.
 Keywords
Butterfly valve;Throttle Valve;Turbulent Intensity;Valve Opening Angle;Pressure Loss Coefficient;
 Language
Korean
 Cited by
1.
SI 엔진의 스로틀 밸브에서 유동장 특성에 대한 실험해석,김철;김성초;최종근;이석정;

대한기계학회논문집B, 2001. vol.25. 7, pp.967-974 crossref(new window)
2.
스로틀 바디가 가솔린 엔진의 출력 및 배기배출물 특성에 미치는 영향에 관한 실험적 연구,조승완;이상석;진동규;심재준;김규보;전충환;장영준;

대한기계학회논문집B, 2008. vol.32. 11, pp.884-890 crossref(new window)
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