CAJ | 학술논문

考虑结构可压缩性修正的影响,发展了一个同时考虑结构可压缩性修正和膨胀可压缩性修正的k-ε湍流模型,新模型包括Chang可实现性、Heinz湍流动能产生项以及Sarkar可压缩性三部分修正.新模型扩宽了以往发展的可压缩性修正模型的适用范围,适用于高超声速(M>5)复杂湍流流动中.通过对多个复杂超声速横侧射流工况的计算,验证了新模型的预测效果.与实验结果相比表明,几个工况下新模型的预测精度都显著高于标准k-ε模型.流体分离强度越大,新模型的修正效果越显著.与标准k-ε模型相比,新模型计算结果与实验更加接近.
고필결구가압축성수정적영향,발전료일개동시고필결구가압축성수정화팽창가압축성수정적k-ε단류모형,신모형포괄Chang가실현성、Heinz단류동능산생항이급Sarkar가압축성삼부분수정.신모형확관료이왕발전적가압축성수정모형적괄용범위,괄용우고초성속(M>5)복잡단류류동중.통과대다개복잡초성속횡측사류공황적계산,험증료신모형적예측효과.여실험결과상비표명,궤개공황하신모형적예측정도도현저고우표준k-ε모형.류체분리강도월대,신모형적수정효과월현저.여표준k-ε모형상비,신모형계산결과여실험경가접근.
Considering structural compressibility effect, a new k-ε turbulence model with structural compressibility and dilatational compressibility modifications was proposed. Three modifications were added to improve the standard k-ε turbulence model. They are Chang realizable, Heinz turbulence production and Sarkar dilatational compressibility correction terms. The new model was applicable in complex hypersonic flows which widens the range of the application of the previous compressibility modification model. Several complex supersonic transverse injection flows were calculated to verify the performance of the new model. Comparisons with experimental data show that the new model significantly improves the predictions than the standard k-ε model. Better results were obtained even in flows with great fluid separation and predictions of the new model were closer to the experimental data than the standard k-ε model.