喷管跨声速流场计算

本文用时间相关法求解定常跨声速喷管流场。对守恒型和非守恒型方程采用全场统一时间步长、当地时间步长和修正超阻尼法进行了计算。计算表明:采用当地时间步长可大大提高收敛速度,采用全场统一时间步长时,数值解非守恒型方程收敛较快;采用修正超阻尼法也能提高收敛速度,但与阻尼系数和时间间隔有关。

CALCULATION OF TRANSONIC NOZZLE FLOW

The time-dependent method is applied to the calculation of transonic nozzle flow in this paper. The transonic nozzle flow is computed by solving the conservation and non-conservation governing equations with uniform integration step size in the full flowfield and local integration step size, and by the corrected dashpot method. The computational rasults show that the convergence rate of numerical solution with local integration step size is the most fastest among these computations, the convergence rate of numerical solution with uniform integration step size for non-conservation equations is more faster than that for conservation equations, and the corrected dashpot method with optimizing damping factor and time interval is a better method for computing transonic nozzle flow.