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计算分析了采用k-ωSST(shear-stress transport)模型、RNG(renormalization group)k-ε模型配合标准壁面函数(RNGk-ε+标准壁面函数)、RNGk-ε模型配合增强型壁面函数法(RNGk-ε+增强壁面函数)3种湍流模拟方法,对典型涡扇发动机轴对称收敛喷管排气系统流场、温度场、组分质量浓度场及红外辐射特征计算结果的影响.研究表明:对于这3种方法,排气系统腔体内壁面压力分布基本一致;但在温度场、组分质量浓度分布以及红外辐射特征方面的差别较大.RNGk-ε+增强壁面函数计算得到的内涵壁面与燃气流的温度、CO2与H2O的质量浓度和红外辐射强度值最大,RNGk-ε+标准壁面函数的计算结果其次,而k-ωSST模型的计算结果最小.通过与试验结果对比,发现k-ωSST模型对排气系统红外辐射特征的模拟更加合理一些.
The effects of RNGk-ε model and RNGk-ε model coupled with RNGk-ε model were analyzed by using k-ωSST (shear-stress transport) model and RNG (renormalization group) k-ε model with standard wall function -ε + enhanced wall function) on the calculation results of the flow field, the temperature field, the mass concentration field and the infrared radiation characteristics of the exhaust system of a symmetrically convergent nozzle of a typical turbofan engine. The results show that These three methods have the same pressure distribution in the inner wall of the exhaust system, but the differences in the temperature field, the mass concentration distribution of the components and the characteristics of the infrared radiation are relatively large. The calculated wall and gas content of the RGG-ε + The temperature, the mass concentration of CO2 and H2O and the intensity of infrared radiation were the highest, the calculation results of RNGk-ε + standard wall function were the second, and the calculation result of k-ωSST model was the smallest. By comparing with the experimental results, it was found that the k-ωSST model Simulation of the emission characteristics of the exhaust system is more reasonable.