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수력학적 공동현상을 이용한 가열장치의 내부 딤플 변화에 의한 열효율 성능평가
박종진(Park, J. J),강찬혁(Kang, C. H),김현수(Kim, H. S),윤준용(Yoon, J. Y) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
In this paper, thermal efficiency measurement is performed with heat generator using hydraulic cavitation about the number and location of reactor’s dimple. Heat generator consist of fixed front,rear cover and rotaing reactor. When reactor’s dimple and cover’s dimple pass each other, vapor is occurred caused by cavitation in flow field. Experiment is performed in 3 case to compare influence on cavitation and thermal efficiency of heat generator in equivalent operating condition. Comparison results show that thermal efficiency is higher that dimple is located in both each side and edge case, each side case and edge case in sequence. This means the location of dimple have more influence on generation of cavitation than number of dimple. Also the more cavitation is occurred the more thermal production is confirmed.
박종진(J.J. Park),이승희(S.H. Lee) 한국전산유체공학회 1995 한국전산유체공학회 학술대회논문집 Vol.1995 No.-
Three dimensional turbulent flow fields around ships are simulated by a numerical method. Reynolds Averaged Navier-Stokes equations are used where Reynolds stresses are approximated by Baldwin-Lomax and Sub-Grid Scale(SGS) turbulence models. Body-fitted coordinate system is introduced to conform three dimensional ship geometries.<br/> The governing equations are discretized by a finite volume method. Temporal derivatives are approximated by the forward differencing and the convection terms are approximated by the QUICK or Kawamura scheme. The 2nd-order centered differencing is used for other spatial derivatives. Pressure and velocity fields are simul taneously iterated by the Highly Simplified Marker-And-Cell method.<br/> To verify the numerical method and turbulence models, flow fields around ships are simulated and compared to the experiments.