Summarization of the Characteristics and Development of Hypersonic Quiet Wind Tunnel

Conventional hypersonic wind tunnel suffers from high noises and fluctuations of incoming flow,which are typically one to two orders of magnitude higher than the practical fight levels.Quiet-flow hypersonic wind tunnel is very essential to develop in order to seek phenomenon of hypersonic transition in tunnel.Thus,first of all,basic concept of quiet wind tunnel is recommended,several key points of technology and design method about laminar nozzle are discussed,noise characteristic and diagnosis way are analyzed in this paper.At the same time,the,basic developing process and present situation of overseas hypersonic quiet tunnel are discussed.In addition,several typical supersonic and hypersonic quiet wind tunnels of NASA are reviewed.In conclusion,it is very valuable and useful for developing Chinese own quiet-flow hypersonic wind tunnel based on the overseas experience and results.