非平行边界层稳定性研究

The nonparallel stability in boundary Layers is analyzed seriously using a new method of parabolized stabilitytheory. The computational method, which is higher accuracy, effective and stable, is eloped. The linear and onlinearevolution of turbance waves and the effect of parallelism on boundary layer stability are studied. Particularly, thenonparallel effects, which are found in the amplitude curves of T-S waves with different spanwise wavenumber, can change stability.characteristics of 3-D disturbance waves from stability with parallel flow into instability with nonparallel flow under some.condition. Amplification factors of the disturbance amplitude obtained are very important for the determination of the transition.position in boundary layers. In research process, many paper are published, and students got Doctor and Master degree. The.research content of this task is a key problem for fluid mechanics and have very important meaning in theory and application.

根据抛物化稳定性方程序（PSE）新方法，研究非平行边界层的线性和非线性稳定性问题；⒄狗瞧叫斜呓绮鉖SE椭圆特性分析法并采用高精度差分格式，建立非平行边界层稳定性的高效数值解法；通过展示非平行流、非线性阶段扰动的演化规律，探讨转捩相关问题。本项目研究内容是流体力学的前沿问题，具有重要理论意义和广泛应用前景。