逆流推力矢量喷管的非定常内流性能研究

基于数值模拟方法,研究了逆流矢量喷管非定常内流性能.结果表明,在一个非定常周期内,前半个周期内附体和非附体的不同情况下,内流性能参数几乎一致,但后半个周期出现一定的差异.这是流动滞后性的表现,滞后性导致了附体不容易脱离.其起因与剪切层有关,逆流剪切层和同向流剪切层的演化过程显著不同,并且可能两者对附体的脱离起了共同的作用.最后,非定常流的结果进一步表明,逆流喷管是一种较高效率的射流式矢量喷管.

Unsteady internal performance study of counterflow vectoring thrust nozzle

Internal performance of unsteady flow of counterflow thrust vectoring nozzle has researched base on numerical simulation.The results show,in the former of half a unsteady period,the performance parameters are almost the same under attachment and deattachment cases,but have a great difference in the after of half a period.It is the representation of the flow hysteresis.The hysteresis leads the attachment of main flow difficult to depart from the wall.The origin of hysteresis may be relate to shear layer.The ...