CAJ | 학술논문

采用数值模拟方法研究了不同流动参数对二元双喉道射流推力矢量喷管（Dual—throat fluidic Thrust—vecto—ring Nozzle，DTN）内流特性和推力矢量控制效果的影响。结果表明，DTN 在非推力矢量情况下，NPR 在3～4范围时，推力系数较大，达到0．968，而流量系数较小，仅为0．93；NPR 再增大，推力系数迅速下降。在推力矢量情况下，落压比一定时，随着次流流量比的增加，推力矢量角增加，而流量系数、推力系数、推力矢量效率减小；次流流量比一定时，随着落压比的增加，推力矢量角减小，系统推力系数先增加后减小，流量系数略微增加。
채용수치모의방법연구료불동류동삼수대이원쌍후도사류추력시량분관（Dual—throat fluidic Thrust—vecto—ring Nozzle，DTN）내류특성화추력시량공제효과적영향。결과표명，DTN 재비추력시량정황하，NPR 재3～4범위시，추력계수교대，체도0．968，이류량계수교소，부위0．93；NPR 재증대，추력계수신속하강。재추력시량정황하，락압비일정시，수착차류류량비적증가，추력시량각증가，이류량계수、추력계수、추력시량효솔감소；차류류량비일정시，수착락압비적증가，추력시량각감소，계통추력계수선증가후감소，류량계수략미증가。
Fluidic thrust vectoring technique is an advanced thrust vectoring concept,it has many potential benefits,such as light weight,control convenience,low manufacturing cost and high ratio of thrust to weight,comparing with conventional mechanical thrust vectoring tech—nique.The effects of several flow parameters on the internal flow of the dual—throat fluidic thrust—vectoring nozzle (DTN)are analyzed by numerical simulation method.The results indicate that DTN can provide high thrust vectoring efficiency with nozzle pressure ratio (NPR)of 3 ~4 (system thrust ratio arrives 0.968,discharge coefficient 0.93)under non—vectoring thrust state. Increase in NPR decreases system thrust ratio rapidly.When NPR is constant,thrust angle in—creases with the increase in the secondary injection flux under vectoring thrust state.However, discharge coefficient,system thrust ratio and thrust vectoring efficiency will decrease simultane—ously.When the secondary injection flux is constant,thrust angle decreases with the increase in NPR,whereas discharge coefficient may increase lightly,and system thrust ratio first increases and then decreases.