Technical Memorandum of National Aerospace Laboratory
巻
244
ページ
35
発行年
1973-06
抄録（英）
The aim of this experiment is to observe phenomena in the flow-field in jet engine exhaust nozzle.Experiments were carried out with the box-type models.Schlieren observations were made at inlet Mach numbers from 0.5 to 1.0 and total-pressure measurements were made by traversing a pitot-tube in the outlet flow from the nozzle.The effects of geometrical parameters of the nozzle and nozzle pressure ratios on discharge coefficient and thrust coefficient were investigated.Test Reynolds number range was 1.8～5×106,based on “equivarent diameter” (twice as large as hydraulic diameter) at nozzle inlet.The test results were as follows : 1.The flow with separation was observed on the surface of the center cone at the lower inlet Mach numbers (M1＜0.6) and the growth of the flow separation was observed as inlet Mach number increased,for all the models experimented.2.The wake of the center cone was wide at the nozzle (model) exit for the range of the lower inlet Mach numbers and the peak of the exit total pressure was observed in the wake of the center cone at higher Mach numbers (M1≧0.74).
ジェットノズルの箱型模型実験
naltm00244.pdf
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