空気エゼクタの実験的研究(第3報, 第4報) : 混合管ディフュザの長さと平行部の長さの性能に及ぼす影響

概要

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Experiments, as to the effects of the lengths of the diffuser and the parallel part of the mixing tube upon the performance characteristics of a pneumatic ejector, were conducted. The area ratio of the ejector was 2.923,while the distance α' from the nozzle exit section to the inlet of the parallel part was α'=8.5. The length of the diffuser was varied as 60.2mm, 160.2mm and 260.2mm, maintaining the divergence angle constant (8 degrees). The vacuum obtained and the ejector efficiency were found to remain unaffected by the length of the diffuser. Next, the length l of the parallel part of the mixing tube was altered as l/e=O.9,3.4,5.9,8.4,10.9 and 13.4,where e denotes the inner diameter of the parallel part (e=10mm). According to results obtained, the optimum value of the length l tends to increase as the velocities of the driving jet as well as the weight flow ratio G_2/G_1 become larger, where G_1 and G_2 denote the weight flow of the driving air and the secondary air, respectively. Further, it was found that the optimum values of l/e lie in the range l/e=8.5〜5,to find the coincidence with the experimental results by L.J. Kastner and J.R. Spooner.
一般社団法人日本機械学会の論文
1956-08-25