Influence Of Suction On Restart Characteristics Of Hypersonic Inlet

The hypersonic vehicle has the advantage of higher speci fic impulse,greater load,farther flight range,lighter structure and lower flight cost,and hypersonic inlet as a major component of the aircraft,its work The state determines the airflow capture capability of the engine.In the course of flight,if the flow of Mach is low or the angle of attack and the downstream back pressure is too high,the flow field will deteriorate rapidly,the intake flow of the capture flow is drastically reduced,which is hypersonic inlet is not starting phenomenon,Resulting i n the combustion chamber can not burn normally,even on the engine structure damage.Flow control is the best way to improve the regenerative performance of the inlet,where suction is an effective method.The non-starting phenomenon of the inlet is mainly reflected in the inlet bag at the entrance,which affects the inlet and outlet of the inlet,resulting in the total pressure recovery coefficient and the flow coefficient of the inlet are too low.Within the low-speed airflow,reducing the degree of separation of the surface layer,effectively improve the ability to restart the inlet,and different suction location and opening area affect the suction capacity and the ability to work in the inlet,The effect of suction on the restart characteristics of the inlet will help us to choose a more appropriate suction scheme to improve the re-starting and operating performance of the inlet.In this paper,we first determine the two-dimensional model and the opening scheme of a specific inlet,calculate the starting angle of the inlet caused by the angle of attack,and obtain the restart by the numerical calculation of the restart of the different suction scheme And the comparison of the critical position and analysis of different pumping schemes under the attack angle of the suction capacity.Then,the change of the inlet flow field under the change of Mach number under the condition of fixed flow angle is taken as the adjustment parameter,and the critical Mach number is adjusted as the standard comparative analysis.The ability to enhance the degree.Then,the flow field is used to adjust the parameters,and the flow field is not activated.The flow field and the critical pressure ratio are analyzed respectively.The difference between the non-starting phenomenon and the flow characteristics of the first two.Finally,all the calculated results show that there are hysteresis loops in the inlet of the configuration,and the change of the hysteresis range of the submerged suction is analyzed,and the variation law of the hysteresis loops under different suction schemes is compared.Based on this,Considering the control effect of the suction scheme and the performance parameters of the inlet in different initial conditions,the corresponding suitable suction scheme for different control parameters is obtained and a method for pumping the initial state is put forward.