To design the exhaust system for scramjet with three-dimensional flowpath,a method for designing three-dimensional scramjet nozzle was developed.It employed streamline tracing technique based on flowfield of axisymmetric nozzle with optimum thrust.According to a typical hypersonic flight condition,an inviscid nozzle with rectangular entrance of 50mm×50mm,length of 560mm and height of exit 147mm was constructed and then the boundary layer correction was applied.Inviscid and viscous flowfields were computed on the design point to get thrust and lift of the nozzle.Compared with two different nozzles constructed with straight walls,it is found that nozzle designed by streamline tracing technique can significantly increase the thrust and the viscous force is an important factor to decrease the thrust
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