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PDPA에 의한 Pintle형 노즐의 미립화 특성실험 -식물유를 중심으로-
유병구(B.G.Yu),차경옥(K.O.Cha),정진도(J.D.Chung),주은선(E.S.Ju) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
An simplified experiment was performed to figure out the atomization characteristics of rice-bran oil which is highly viscous liquid by applying ultrasonic energy to improve the atomization of spray droplets. A spray system, an ultrasonic system, and three kinds of pintle-type nozzles(pin-edge angle: 5°, 10°, 15°)was manufactured. To investigate the effects of ultrasonic energy on the atomization of a highly viscous liquid, a phase doppler particle analyzer was used for measurement and calculation of spray droplets data. Nozzle opening pressures were chosen of 3 levels, i.e. 10. 13, and 16MPa. The improvement rate of the spray atomization by the ultrasonic spray atomization by the ultrasonic spray compared with the conventional spray was about 10% in the case of pintle type nozzles. With the increase of the nozzle opening pressure and pin-edge angle, the atomization of spray droplets was improved.<br/>
4행정 가솔린 기관의 배기계 맥동압력 전달특성에 대한 주파수 해석
이준서(J.S.Lee),정광국(K.K.Chung),박종남(J.N.Park),유병구(B.K.Yoo),박세만(S.M.Bahk),차경옥(K.D.Cha) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Pulsating pressure of exhaust system is generated by pulsating gas flow due to working of exhaust valve. The pulsating gas flow is closely<br/> concerned to engine power loss according to back pressure and exhaust noise. However, because of nonlinear effect due to large amplitude of pulsating pressure. it is difficult to exactly calculate pulsating pressure propagation in exhaust system of typical engine, Moreover, in case of estimating exhaust system performance, conventional prediction method which is based on linear theory, gives many restrictions and overestimate.<br/> As the first step for solving this problem, this paper contains experimental model to measure pulsating pressure propagation and shows power spectrum density, frequency response function, coherence in frequency domain for characterize pulsating pressure propagation in exhaust system of typical engine.<br/>