带肋矩形单通道流动传热数值模拟

Numerical Simulation on Flow and Heat Transfer Characteristics in a Rectangular Channel with Ribs

针对燃气透平第一级动叶内部冷却通道,建立一个带45°斜肋的冷却通道的流动模型和固体模型,对流动模型进行计算,分析肋片对冷却气体流动和通道中传热的影响,并将流动计算得出的传热系数导入到固体模型中进行计算。结果表明:肋片引起气流的分离与再附着,并引导气流产生横向的流动,加强了壁面大部分区域的传热;当入口Re达到19 413时,可以满足冷却要求。

A flow model and a solid model were respectively established for the internal cooling passage with 45-degree ribs installed in the first stage of a gas turbine rotor blade. The effects of above ribs on the flow and heat transfer characteristics in the cooling passage were studied through numerical calculation with the flow model, following which the heat transfer coefficient calculated was introduced into the solid model for further calculation purposes. Results show that the ribs may cause separation and reattachment of the gas flow, and would help to generate transverse flow of the gas, thus enhancing the heat transfer in most area of the wall. The cooling requirements can be satisfied when the Reynolds number at the entrance gets up to 19413.