不同飞行状态下固体火箭发动机尾喷焰数值研究

为了研究飞行状态对固体火箭发动机尾喷焰的影响,建立了含化学反应项和组分输运项的N-S(Navier-Stokes)控制方程,并采用MUSCL(monotonic upstream-centered scheme for conversation laws)Roe格式的有限体积法进行求解.在此基础上,结合热力计算结果对某固体火箭发动机在不同飞行状态下的化学反应流和单一组分流进行仿真计算.结果表明:初始倾角和第一马赫波节长度随飞行高度的增加而增大,随来流马赫数的升高而减小.同单一组分流相比,化学反应流对第一马赫波节的影响较初始倾角显著.射流轴线温度因飞行状态的不同有较大涨落差异.初始倾角、第一马赫波节由来流总压决定,射流轴线温度由激波结构、复燃效应、来流条件等因素共同决定.

Numerical study on the plumes of solid rocket motor under various flight conditions

To analyze the behaviors of solid rocket motor plumes under different flight conditions, the finite volume method based on the MUSCL (monotonic upstream-centered scheme for conversation laws) Roe format was employed after establishment of governing equations including Navier-Stokes (N-S) equation and chemical reaction terms. Combined with the results from thermal calculations, chemical reaction flow and single species flow were numerically simulated for a solid rocket motor under various flight conditions. Results show that both the initial angle of the jet and the length of the first Mach shock cell rise with the increase of altitudes and the decrease of the incoming Mach numbers. The effect of the length of the first Mach shock cell is more significant than initial angle of the jet in chemical reaction flow than that of single species flow. Centerline temperature with various flight conditions is much different. The initial angle of the jet and the length of the first Mach shock cell are determined by incoming total pressure and the centerline temperature determined by the structure of shock, afterburning effect, and incoming conditions.