周辺噴流型エアクッションの浮揚動力特性の研究

概要

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In the field of A.C. (Air Cushion) technology, the non-dimensional power coefficient, Cp, is made rapidly high with h/t small, where h is the ground height and t is the jet thickness, and the theoretical predictions of Cp based on four familiar theories are different. Therefor, it is necessary to examine the characteristics of the hovering power by the detailed experiments, in order to find out the optimum Cp; to find out the height ratio, h/t at which Cp becomes minimum. We, hence, conducted the experiments with the two-dimensional model in the range of h/t≦3 and the results are summarized as follows; (a) The optimum value of h/t was 1.1~1.5, so h/t ＜1, which is used in practical A.C., must be converted. (b) Jet setting angle was reduced from 90° to 45°, then the optimum Cp was improved from about 0.7 to 0.5. (c) Because of Cp＜1, hovering power is smaller than the power of ideal plenum chamber type A.C.,(Pt=Pc), so, in this range of Cp, the peripheral Jet type A.C. is superior. (d) Optimum power performance was given at the cushion pressure coefficient, 0.8, and mass flow coefficient, 0.65.
津山工業高等専門学校の論文
1983-10-25