Expansion Tube Operation with Thin Secondary Diaphragm

摘要: DOI: 10.2514/1.23846 An experimental study of expansion tube operation was conducted by highlighting the interference due to secondary diaphragm, which separates shock and acceleration tubes, upon wave transition past separation. The in-tube processes were diagnosed framing shadowgraphs on-wall pressure measurements. Among commercially available diaphragm materials examined, only when using thinnest Mylar (3 � m in thickness), not accompanied serious flow disturbance reflection or loss through cloud ruptured fragments. Although cellophane more brittle suitable for fragmentation, it had mass penalty caused its smaller tensile stress commercial availability, thereby resulting much larger disturbances.