OS1-6 二次元ラジアルタービンの断熱効率に対するチップクリアランスの影響(OS1 マイクロエネルギー変換,分散と集中の共存)

概要

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In order to improve the adiabatic efficiency of ultra-micro gas turbines, aerodynamic performance was measured for a two-dimensional small radial turbine. Clearance between the rotor and the casing is an important parameter of the ultra-micro gas turbines. The adiabatic efficiency depended on the ratio of the tip-clearance, C_r to the rotor height, H_r. In the case of conventional rotor, the loss of adiabatic efficiency was proportional to the clearance-ratio of C_r/H_r. However, the loss of small turbine was found to be expressed by the third-polynomial function of C_r/H_r. As a result, the loss was almost constant around C_r/H_r of 0.1. The loss decreases drastically at C_r/H_r of 0.05. However, it is practically difficult to manufacture a rotor with such small clearance by MEMS-processing. Both of the aerodynamics and MEMS-processing points of view, C_r/H_r of 0.1 was found to be a reasonable value for ultra micro gas turbine.
社団法人日本機械学会の論文
2006-06-28