激光脉冲能量作用下隔离段激波形态及发展控制的数值研究

为了寻求有效的流动控制方法来降低隔离段总压损失，本文基于非定常雷诺平均的Navier-Stokes方程，探究激光脉冲能量沉积对二维及三维隔离段流场马赫反射的控制效果。在来流马赫数分别为1.61和2.51的隔离段流场马赫反射上游，加入脉冲能量沉积，对比激励流场与基础流场，结果表明：能量沉积主要通过高温热核和其诱导的压力波两种方式对马赫反射结构施加作用，显著地影响了马赫反射结构，促使Ma∞ =1.61来流工况下马赫杆的高度减小，马赫反射强度减弱；Ma∞ =2.51来流工况下的马赫反射结构转变为稳定的正规反射，减小了总压损失。控制过程包括：(1)能量沉积产生的局部高温降低当地马赫数，减小马赫反射强度；(2)高温热核诱导的弓形波与马赫反射相互作用，马赫反射结构变形；(3)以反压形式影响马赫反射。

Numerical Study of Laser Pulse Energy Deposition on Shape and Development Control of Shock Wave in Isolator

In order to find an effective flow control method to reduce the total pressure loss in isolator, the unsteady Reynolds averaged Navier-Stokes equations are used to simulate the control effect of laser pulse energy deposition on the Mach reflection for the two and three-dimensional isolator. The laser pulse energy deposition is introduced upstream of the Mach reflection of the flow field in isolator with incoming flow Mach numbers of 1.61 and 2.51 respectively. Compare the excitation flow field and the basic flow field, results show that the energy deposition affects the Mach reflection mainly through the high temperature spot and its induced pressure waves, and it has a significant impact on the Mach reflection. At Mach number of 1.61, the energy deposition promotes the height of the Mach stem to reduce, and the intensity of the Mach reflection decreases accordingly. At Mach number of 2.51, the transformation of the Mach reflection into a stable regular reflection occurs. The control process includes: a. the local high temperature of the energy deposition reduces the local Mach number, thereby weakens the intensity of the Mach reflection; b. the high temperature thermal spot induces the bow wave to interact with the Mach reflection, and the Mach reflection is deformed; c. the energy deposition affects the Mach reflection in the form of the back-pressure.