论文部分内容阅读
基于非结构网格,采用经典的wilcox k-ω模型和其改进的kω-Pω模型,建立了用于模拟大攻角旋涡流动的计算方法。以尖前缘的65°三角翼为例,模拟了旋涡的产生、发展、破裂过程,验证了wilcox k-ω模型和kω-Pω模型在典型的亚音速计算状态下对复杂涡系干扰的模拟能力。通过对多种计算的流场与气动力详细结果的比较分析,就两种湍流模型对大攻角复杂旋涡流动的预测能力和敏感性等进行了评估。结果表明:kω-Pω模型通过r值区分剪切层和涡核区域,从而对涡核区域的涡黏性进行修正。对最后的模拟结果有一定的修正作用,可以作为湍流模型修正的一个方向。RANS方法在预测涡破裂点位置和二次涡的强度及位置方面仍存在很大的缺陷。
Based on the unstructured grid, the classical wilcox k-ω model and its improved kω-Pω model are used to establish a method to simulate the vortex flow at large angles of attack. Taking the leading edge of the 65 ° delta wing as an example, the vortex generation, development and rupture process are simulated, and the simulation of complex vortex disturbances under the typical subsonic computations is validated by the wilcox k-ω model and the kω-Pω model ability. Through the comparative analysis of the detailed results of flow field and aerodynamic force of many kinds of computations, the predictive ability and sensitivity of the two turbulence models to the complicated swirl flow at high angle of attack are evaluated. The results show that the kω-Pω model can differentiate the shear layer and vortex core region by r value, and then correct the eddy viscosity in the vortex core region. The final simulation results have some amendments, can be used as a turbulence model to amend a direction. The RANS method still has a big flaw in predicting the location of the vortex rupture point and the strength and position of the secondary vortex.