应用于翼型绕流的线性/非线性湍流模式的研究

本文选取了四个线性湍流模式、四个非线性涡粘性湍流模式和一个显式代数应力模式对绕翼型的不可压缩分离流动进行了数值模拟.因计算鲁棒性的需要,其中部分模式在壁面附近耦合了一方程模式.通过与实验结果的比较,对翼型在大攻角情况下流动产生分离的气动特性进行了评估.计算结果表明,非线性模式能够较好地反映湍流的各向异性和曲率影响.

Linear and nonlinear turbulence models for simulation of the flows around airfoil

Tile-shaped aerospike nozzle and bell nozzle were studied by experiments and numerical simulation. Chamber pressure, thrust and ambient pressure were acquired. Experimental efficiency altitude characteristics were illustrated. The performances of test nozzles were computed and the numerical results show good agreement with the experimental data. It is shown that tile-shaped aerospike nozzle has the capacity of altitude compensation compared with bell nozzle. It is found that plug contour designed by characteristics has good performance and simplified line contour causes severe performance losses. For its high performances, tile-shaped aerospike nozzle can be a promising candidate for the future engineering application.