Effect of Nonequilibrium Condensation of Moist Air on the Boundary Layer in a Supersonic Nozzle

When condensation occurs in supersonic flow fields, the flow is thected by the latent heat released. In the present study, Navier-Stokes equations were solved numerically using a 3rd-order MUSCL type TVD finitedifference scheme with a second-order fractionabetep for time integration. Baldwin-Lomax model, that is the algebraic model, called the zero equation model was used in the computations. The effects of initial conditions (initial degree of supersaturation and total temperature in the reservoir) on condensing fiow of moist air in a supersonic circular half nozzle were investigated. In this case, the effect of condensation on the boundary layer was also discussed in detail. As a result, the simulated flow fields were compared with experimental data in good agreement, and the velocity and temperature profiles were largely changed by condensation.

The Effect of Non-Equilibrium Condensation on Supersonic Air Flows over Rectangular Cavities

数字模拟在开的、矩形的洞上为超声的二维的流动被执行了(length-to-depth 比率是 L/D = 1.0 和 3.0 ) 数以便为流动马赫在洞附近在超声的内部流动上调查潮湿的空气的非平衡冷凝作用的效果 1.83 在洞入口。在现在的计算调查，压缩流动被潮湿的空气的扩大在一张 Laval 嘴生产。计算结果证明没有冷凝作用，在上游的旅行压缩波浪变得比那些弱。因而，更弱的压缩波浪不能强烈使 shear 层激动，没有冷凝作用，在洞的摆动的振幅变得比那些小。在 L/D = 的情况下的非平衡冷凝作用的出现 1.0 强烈与 L/D = 相比在洞影响了摆动的振幅和频率 3.0。