关键词: 转捩;冷却;气热耦合;对流换热系数准则

Abstract: NASA-MarkII transonic blade was selected as an example in this paper to investigate the application of the Transition k-kl-ω model in gas thermal coupling calculation of an innercooled blade, and to analysis the difference between the whole coupled method and heat transfer coefficient criteria coupled method in cooling channels. Compared with other turbulence models, the transition model is capable of predicting the boundary layer of laminar flow and the transition state more accurately. In the Transition k-kl-ω model, laminar kinetic energy was used to describe the development of disturbance in the early stage so as to avoid the empirical formula which includes flow turbulence intensity, and the“split system” was introduced into this model to describe the interaction between laminar and turbulent fluctuation. Besides, Tollmien-Schlichting wave was added in the bypass transition and natural transition source term, as a result, the computational temperature results for behind the strong shock wave agreeed better with the experimental value than that obtained with intermittent transition factor model. Using the coupled heat transfer coefficient criteria in the cooling channel heat transfer calculation, which removes the error caused by cooling channel boundary conditions, leads to better agreement with the experimental results and easier engineering applications. 

Key words: Transition；Cooling；Gas thermal coupled；Heat transfer coefficient criteria