【摘要】 本文提出了一套求解船用燃气轮机进气滤清器流道流场的数值方法,成功地计算了流道内流场的状态,给出了各种不同型号流道的气动特性,对指导滤清器的设计有较大的现实意义, 在这套方法中,我们应用上风差分来逼近二维、非定常、粘性、不可压缩流体非守恒型的N-S方程,提出了一种可计算雷诺数高达上万的粘性流的差分方程,考察了这种差分方程的稳定性,收敛性、精度和人工粘性,本文还提出了处理一些边界拐点处壁涡的计算方法,实际算例表明,使用本文提出的差分方程和壁涡处理方法给出的计算结果和实验吻合良好。更多还原

【Abstract】 A numerical method is presented in this paper for the solution of flow field in marine gas turbine air intake filtration channel. By use of this method the state of flow field was successfully calculated, and aerodynamic characteristics were obtained for various types of filtration channels. The work we have done is expected to be of considerably realistic value in guiding the design of such kind of filter. Using uptream difference to approach the non-conservative type N-S equation for two-dimensional, timedependent, viscous and incompressible flow, a difference equation was formed and its stability, convergence, accuracy and artificial viscosity were examined. This equation be used to calculate viscous flow with Reynold number up to tens of thousands, Also presented in this paper is a calculation method for treating wall vortex at boundary inflection points Careful studies show that calculation results based on the difference equation and wall vortex treatment proposed here are in good agreement with those from experiments.更多还原