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토크 컨버터 토러스 형상 변화에 따른 유동 특성에 관한 연구
최완(Wan Choi),권의섭,장영기(Young-gi Jang),장재덕(Jae-duk Jang),주인식(In-sik Joo) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
The torque converter is a very complex turbo machine. Its geometry is highly three-dimensional, the working fluid is viscous oil, and it operates under a wide range of flow conditions. However, its hydrodynamic design technology has advanced very little during the past serveral decades. The design procedure has been based greatly on the use of the cut-and-try approach. The use of such an approach may satisfy the design requirements in terms of diameter, axial length, and torque capacity factor, but it may never lead to optimized design for any given application. In addition, it has been proven to be too costly and time consuming. The current design tools need to be upgraded in order to significantly advance the hydrodynamic design technology. A review of the technology needs in the areas of internal flow, torus design, and performance is presented. At first, the three dimensional internal flow fields and the physical mechanisms of the internal flow losses are described. Secondly, case analyses of a torus shape, using potential flow and viscous flow by the finite element method, are shown. Lastly, technology is required to develop an optimum performance model is presented.