高速进气道抛罩过程内流场演化特性研究

为探究进气道整流罩打开过程中内流场的演化规律,基于重叠网格法求解N-S方程详细分析了抛罩过程中内流场演化过程与特征流场结构.研究表明,在进气道封堵时,整流罩前端发展出V型激波,整流罩尾部形成后向台阶且产生一对涡矢量方向相反的流向涡;在整流罩打开过程中,整流罩前端的V型激波与尾部的后向台阶均会对内流场流动产生影响,捕获流...

Internal Flow Field Evolution Characteristics for Inlet Cover Separation of High Speed Inlet

To explore internal flow field on the inlet cover separation process, the separation process simulation was based on overset method. The evolution process of internal flow field and characteristic flow field structure were analyzed in detail. Numerical simulations show that a V- swept shock wave is formed at the front of the inlet cover, and a backward facing step that induces a pair of streamwise vortexes with the opposite vectors is formed at the rear of inlet cover. On the separation process, the V-swept shock wave and the backward facing step both affect the internal flow, and the mass flow rate at throat reaches its peak at intermediate moment and is greater than that at a stable moment. If the flow is quasi-steady and no large separation zone exists in the inner inlet during the separation process, inlet starts when the V-swept shock wave meets the lip line, and the motion of inlet cover no longer affects the internal flow field. The assumed constant acceleration rotation was consistent with the reconstructed real rotation, and a more accurate motion simulation suggests the cubic angular velocity function.