研究离心叶轮压气机性能优化问题,针对发展迅速、准确预测复杂流动离心压气机的性能设计是非常必要的.传统方法用显式时间推进法效率低、收敛速度慢等缺点,采用隐式残差光顺以及基于变分原理的多重网格方法,具有计算效率高、收敛速度快等特点的数值仿真,采用改进的数值算法对内部三维粘性流场进行了数值仿真,给出了多重网格重数对收敛速度的影响,数值预测了不同流量下的流场流动情况,并与实验结果进行了比较.研究结果表明,多重网格可以有效地加速收敛,数值结果与试验结果吻合较好,改进的数值方法可以较好的预测离心叶轮的性能.%It is essential to develop rapid and precise three-dimensional viscous code for designing centrifugal compressor. For the low efficience and low convergence rate of explicit time-marching method, an advanced threedimensional viscous code is developted to improve convergence rate using some accelerating techniques, such as local time step method,implicit residual smoothing method and multigrid method. This code is demonstrated for predicting the internal flow field of the Krain' s centrifugal impeller. The numerical results are compared with experimental data quantitatively at different operating conditions. Comparisons show that the computational convergence rate is improved and the code is accurate viscous solver for engineering applications. The presented code is able to predict the flow development and performance in the impeller well.
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