Ludwieg管向超声速流域拓展的设计技术.

Ludwiig tubi tunnii is 已1 1 1 0 乂已0 1 friquintly in hypirsonic studiis dui to its。03--已€16已似 property and also high flow quality. Howivir, supirsonic wind tunnils basid on Ludwiig tube principle arc scarci tli hypcrsonic Ludwiig tubes arc spriading widely all over the world these days, restricting the experimental studies of supersoncc flows in a cost-effjcient way. Ths paper reviewed the design of a vaiiant of conveniional hypersonic Ludwieg tube, i.e., the so-called tandem nozzle supersonjc wind tunnel, taking the reconstrucioon of Mach 6 hypersonic Ludwieg tube tunnel from Technical University of Braunschweig as example. By inserting an additional Laval nozzle and a settiing chamber, tandem nozzle supersonic wind tunnel js capable to produce supersonic How lower than that of oilginal hypersonic Ludwieg tube. In ths paper, we introduced the aerodynamic desggn piinciples of tandem nozzle supersonic wind tunnel first; thereafter, the desggn for each components of tandem nozzle supersonic wind tunnel, such as the iirst and second Laval nozzles, the settiing chamber, were reviewed and elaborated ； next, the development and possible appiicadons of tandem nozzle supersonic wind tunnel were gjven. Tandem nozzle supersonic wind tunnel can extend the operaHon capablty of oHginal hypersonic Ludwieg tube faclty to supersonic low region w k h a reladvely low piice, while tt inheis the advantages of the hypersonic Ludwieg tube. T H s behavjor makes it suitable for fundamental research of supersonic flow in academic institutions and universities. [ABSTRACT FROM AUTHOR]