马赫数振荡状态下带抽吸槽进气道非定常数值模拟

研究了在来流马赫数振荡状态下带抽吸槽的二维混压式超音速进气道的气动特性，通过给定非定常边界条件，对飞行马赫数为2．2、振荡马赫数幅值为0．154的进气道非定常流场进行了数值模拟。与定常条件下数值模拟结果进行对比，结果显示非定常流场与定常流场有较大差异。在振荡状态下，进气道的性能发生周期性变化，存在一个椭圆形或类似椭圆形的迟滞回路。

Unsteady numerical simulation of the inlet with a bleed slot in oscillating flow

The aerodynamic characteristics of a 2-D supersonic inlet with a bleed slot are studied in this paper. By the adoption of the given unsteady boundary conditions, the inlet unsteady oscillating flow fields are stimulated, in which the motion is oscillating around the flight Mach number of 2.2 with the amplitude of 0.154. In comparison with the steady simulation results, it is showed that the unsteady flow fields are quite different from the steady ones. Under the conditions of unsteady flow, the inlet capacity changes with a periodicity and varies along a hysteresis loop whose shape is ellipse or similar to ellipse.