Numerical investigation on performance of second throat in transonic wind tunnel

This paper presented the numerical investigation reports about the performance of transonic wind tunnel's second throat.Firstly,second throats were designed according to the general design rule.Then exact Mach number control was studied by numerical simulation when different second throat areas were analyzed by adjusting wall flaps and center body.The numerical results indicate that the control precision of Mach number is 0.001.At last,different models were studied based on the numerical results,and then the most efficient model was selected.