OS1-09 超小型ラジアルタービンの研究(OS1 マイクロエネルギー変換)

概要

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A small-sized gas turbine engine with rotor-tip diameter less than several centimeters has great advantage of its high energy-as well as power-density and is expected to become one of the major portable power sources in the near future. We are thus developing a small-sized gas-turbine engine that has a rotor-tip diameter of 40mm and is expected to generate 2-3kW at the designed rotational speed of 235,000rpm. In this article recent progress in these developments will be described. Since the shape of the rotor is restricted to two-dimensional by MEMS-based fabrication constraint, a particular emphasis is placed on the improvement in adiabatic efficiency of a two-dimensional turbine rotor. We are also developing an accurate numerical method that is applicable to the prediction of small-sized turbine flows. When they are applied to transitional as well as low Reynolds number turbulent flow, which is most likely to take place in a small-sized radial turbine, conventional numerical methods based on the Reynolds-average Navier-Stokes equations (RANS) have essential limitations with regard to their numerical accuracy. In order to overcome this problem, the Large-eddy Simulation technique (LES) has been applied to the prediction of turbine cascade flows. The results of LES computations will also be presented in detail.
一般社団法人日本機械学会の論文
2005-06-28