论文部分内容阅读
以FLUENT6.1为工具进行并行计算,数值计算求解二维和三维稳态可压缩Navier-Stokes方程,模拟了三维壁面效应对扁平形状硅收缩-扩张微喷管内温度和压力的影响,进而研究了三维壁面效应对微喷管的流量系数和推力效率性能的影响。数值计算结果表明:对于喉部深宽比较小的扁平形微喷管,三维壁面效应较大,三维喷管内流体的速度小于相应的二维喷管内流体的速度,而三维喷管内流体的温度大于相应的二维喷管内流体的温度;二维数值计算的流量和推力均大于对应的三维数值计算结果,其差值随着喉部特征雷诺数的减小而增大。二维数值计算结果不能正确预测喷管出口实际流量和微推力。
FLUENT6.1 as a tool for parallel computing, numerical calculation of two-dimensional and three-dimensional steady-state compressible Navier-Stokes equations to simulate the three-dimensional wall effect on the flat silicon shrinkage expansion nozzle temperature and pressure effects, and then studied the Influence of Three-Dimensional Wall Effect on the Flow Coefficient and Thrust Efficiency Performance of Micro-Nozzles. The numerical results show that the effect of the three-dimensional wall is larger for the flat nozzle with smaller throat width and width, the velocity of the fluid in the three-dimensional nozzle is smaller than that of the corresponding two-dimensional nozzle, and the temperature of the fluid in the three- The corresponding two-dimensional nozzle fluid temperature; two-dimensional numerical calculation of the flow and thrust greater than the corresponding three-dimensional numerical results, the difference with the throat characteristic Reynolds number decreases. Two-dimensional numerical results can not correctly predict the nozzle outlet actual flow and thrust.