双楔面诱导的斜爆轰波阵面的磁流体控制

基于高超声速飞行器爆轰推进发展需要,数值研究了由双楔面诱导的斜爆轰波类型及其磁流体(MHD)控制的可行性,探讨了后楔倾角变化对双楔斜爆轰流场与MHD控制的影响.结果表明:对于前、后楔倾角分别为15°与20°的双楔面诱导的斜爆轰,Lorentz力可以将不同来流马赫数条件下的稳定斜爆轰波阵面恢复到设计位置,并可以使不稳定斜爆轰波趋于稳定,但是,无法将不稳定斜爆轰波恢复到设计位置.而当后楔倾角稍微增加时,若爆轰流场稳定,同样可对斜爆轰波阵面进行有效控制.但当后楔倾角大于25°时,稳定斜爆轰波流场失稳,此时MHD无法控制流场稳定性.但若增加气体反应速率,虽然斜爆轰波不稳定,MHD控制却可使其趋于稳定,但无法将爆轰波阵面恢复到设计位置.

MHD control of oblique detonation wave front induced by double wedges

Based on the requirement of detonation propulsion of the hypersonic aircraft research,both of the structural types of the oblique detonation waves (ODWs) induced by double wedges and the feasibility of its magnetohydrodynamic (MHD) control of oblique detonation wave (ODW) have been investigated numerically,furthermore,the influences of angle variations of the second ramp on the detonation flow field and MHD control have been discussed.The results show that,for the double wedge detonation with the first and second ramp angles of 15° and 20°,respectively,MHD control can return the position of a stable ODW wave front to its designed location,and can also turn the unstable ODW to be stable,but it is unable to return the unstable ODW front back to the desired place.With the increase of the second ramp angle,the MHD control can also return the ODW front under the condition of a stable ODW.However,when second ramp angle is bigger than 25°,the flow field becomes unstable,and it cannot be manipulated.In this case,with the increase of reaction rate,the ODW stability can be controlled again,but there is no way to return its front to the desired location.