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부분입사형 초음속 터빈 익렬내 유동 특성에 관한 수치적 연구
신봉근(Bong-Gun Shin),조종재(Jong-Jae Cho),정수인(Soo-In Jeoung),김귀순(Kui-Soon Kim),이은석(Eun-Seok Lee) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Turbo-pump system, an essential component of liquid rockets and induced weapons, adopts a partial admission axial turbine which drives pump. And the turbine of a turbo-pump system is usually operated at supersonic condition due to its high loading chracteristics. Therefore, reseaches about flow and performance characteristics of a partial admission supersonic turbine must be preceeded to progress the aerospace and defense industries as well as the development of turbo-pump systems. In this study, flow characterisitics within blades of the partial admission supersonic turbine are numerically investigated by using Fine Turbo, a commercial CFD Code. Before performing the numercial analyses, to verify accuracy of the numerical result computed by Fine Turbo, I performed the comparison between the numerical results with J.J.Cho’s experimental results. It is found that the numerical results show good agreement with the experimental results. Computations about the partial admission supersonic turbine have been performed to investigate flow characteristics including shock patterns. It is also found that the flow and performance of partial admission supersonic turbine are largely depend on shocks ocurred in the nozzle and at the leading edge of blades, expansion or compression at exit of nozzle and separations occurred in passage.
익스팬더(반경형 터빈) 상사조건에 관한 실험적 및 수치적 연구
신봉근(Bong Gun Shin),김전구(Jeongu Kim),임창우(Changwoo Lim),임강수(Kangsso Im),정세환(Sehwan Jeong),백기영(Kiyoung Baik) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
Unlike the turbines used in general gas turbines and aircraft engines, the radial turbines, referred to as expanders, are vary widely used in the industrial area. One of the most important factors for designing and manufacturing the expander with a wide variety of operating conditions is to predict more accurately the expander performance. For energy equipment manufacturers, it is very important to meet the performance targets presented to customers as well as to develop an expander with a good performance. The existing method for predicting the performance of expander (radial turbine) has a limitation. In this study, we proposed a more accurate method for predicting the performance of an expander. In addition, we tried to verify the accuracy by comparing numerical and test results.
메탄계 가스의 Two-Phase Flow 현상에 따른 가스 익스팬더 성능 및 유동 특성 분석
신봉근(Bong Gun Shin),조연화(Yeonhwa Cho),임찬선(Chansun Lim) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
In recent, the use of expander at a re-liquefaction system installed at LNG Ships is continuously increasing in order to improve the system performance. Expander used at the reliquefaction system can drop the temperature of the working fluid at the system exit to a lower level than JT valve and can reduce the power consumption of the system by using the energy generated during expansion process. The performance of the re-liquefaction system improves as the expander expansion ratio increases, which results in a two phase flow of working gas inside the expander. This working gas two phase flow reduces the expander’s aerodynamic performance and deteriorates the structure / dynamic characteristics. Therefore, it is very important to analyze the influence of the two phase flow on flow and performance characteristics of the expander. However, it is very difficult to investigate the effect by using previous the numerical methodologies due to complicated numerical models and high computation costs. In this study, the influence of the two phase flow on the flow and performance characteristics of expander using methane-based mixed gas as working gas were analyzed. Next, the new numerical methodology was suggested in order to reduce the computational cost and to improve the accuracy.