Investigation of Supersonic Air Ejectors : Part 2,Effects of Throat-Area-Ratio on Ejector Performance

概要

論文の詳細を見る
The performance of a supersonic air ejector was experimentally studied over a range of ejector-to-nozzle throat-area-ratios Ψ and primary nozzle Mach numbers M_<lp>. The investigations covered both straight-tube and second-throat ejector types. As the result, the effects of the ratio Ψ on the ejector performance were made clear. The performance curves were classified into five groups by the values of Ψ and a primary chamber-to-ambient pressure ratio p_<op>/p_a. For a fixed Ψ, an optimum p_<op>/p_a exists which realizes a maximum secondary flow rate and a minimum secondary chamber pressure. Also, for a fixed M_<lp>, the optimum p_<op>/p_a becomes minimum at a certain Ψ, which was defined as an optimum throat-area-ratio. The physical meanings of the optimum pressure ratio and the optimum throat-area-ratio were clarified using the results of pressure measurements and optical observations.
一般社団法人日本機械学会の論文