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초공동 수중비행체의 공동영역 내부에서 분사된 배기가스가 수중비행체의 항력에 미치는 영향에 대한 수치해석적 연구
유상원(S.W. Yoo),이우근(W.K. Lee),김태순(T.S. Kim),곽영균(Y.K. Kwak),고성호(S.H. Ko) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
Rocket propelled supercavitation under-water vehicle has very high speed. Exhaust gases are locked in cavity in the water. In other words, cavity in the water is consist of gas and vapor. So it is important how exhaust gas affect to under-water vehicle. In this paper, numerical analysis of supercavitating flows are performed 3 phase fluid consisted of water, vapor and exhaust gas. As a results, exhaust flow backward into vehicle because of density contrast between water and exhaust gas. back flow gas decrease drag force change of under-water vehicle. Numerical analysis are performed to investigate effect on drag force by back flow of exhaust by changing the shape of the underwater vehicle.