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압축성 박리 유동에서 Realizability 조건의 영향
박수형(S.H. Park),사정환(J.H. Sa),김지웅(J.W. Kim) 한국전산유체공학회 2007 한국전산유체공학회 학술대회논문집 Vol.2007 No.-
The realizability condition has been applied to modern turbulence models. Simulations are performed to compare k-ai turbulence models imposing the realizability condition. An improvement to the k-ε turbulence model is also presented and shown to lead to better agreement with data for supersonic base flows. The improvement is achieved by imposing a grid-independent realizability constraint in the Launder-Sharma k-ε model. Numerical results for several test problems show a critical role of the realizability constraint in the prediction of separated flows.
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이일영(I. Y. Lee),김지웅(J. W. Kim),강만곤(M. G. Kang),김영운(Y. W. Kim),송문기(M. K. Song) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Governors control the revolution speed of heat engines such as diesel engines, steam turbines and gas turbines. Precise and prompt tests for the control performances of governors are essential both in governors' manufacturing processes and in governors' maintenance processes. In the conventional governor test systems controlled by analog type electronic controllers, the incorporation of heat engine's dynamics to the test system have been considered very difficult to realize. This study suggests a new governor test system controlled by a digital controller using a personal computer. The application of the digital controller to the test system instead of the analog type electronic controller have brought about the following advancements; (1) heat engine's dynamics could be implemented easily in the test system, (2) automatic test data acquisition both in steady state and in transient state enables us to save test time and to enhance the reliability of the tests.
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