CAJ | 학술논문

对冷气掺混数值模拟中的计算网格、湍流模型、射流边界条件等影响精度的若干问题进行分析。在吹风比0.5下，对不同网格分布、湍流模型、射流边界条件进行数值模拟，所得结果与Ajersch的实验结果进行对比。结果表明，出口下游的网格分布可适当稀疏以减少计算量；在所研究的几种湍流模型中，k-ε模型所得结果与实验结果吻合得最好；考虑射流通道内流动能提高精度，在射流出口给定流场分布也可保证计算结果的精度。
대랭기참혼수치모의중적계산망격、단류모형、사류변계조건등영향정도적약간문제진행분석。재취풍비0.5하，대불동망격분포、단류모형、사류변계조건진행수치모의，소득결과여Ajersch적실험결과진행대비。결과표명，출구하유적망격분포가괄당희소이감소계산량；재소연구적궤충단류모형중，k-ε모형소득결과여실험결과문합득최호；고필사류통도내류동능제고정도，재사류출구급정류장분포야가보증계산결과적정도。
Several parameters which affect the precision of numerical simulation for cooling air mixing were investigated, including mesh, turbulence model and boundary conditions. The comparison between the results with these parameters and measurement at a blowing ratio of 0.5 was made. The meshs at the far downstream from the exit of injection could be coarser to reduce the amount of computation. The k-ε turbu?lence model produced the result which matched the measurement best. The distribution of velocity and tur?bulence kinetic energy at the exit of injection is non-uniform because of the flow within the jet channel, so the geometry of jet channel should be taken into consideration to elevate the precision of numerical simula?tion. Also, distribution of flow-field at the jet exit could be fixed to ensure the precision of computation.