传热设计流程在涡轴涡轮冷却中的应用

Application of Heat Transfer Design Process for Turbine in Turbo Shaft Engine

关键词:  流程  涡轮  管网计算  温度  气热耦合 

Key words:  Process  Turbine  Pipe network calculations  Temperature  Aero-thermal conjugated

摘要:

为了设计适用于涡轴发动机涡轮动叶的冷却结构,将一套涡轮传热设计流程应用于动叶冷却结构设计中,设计后对管网计算不能准确模拟叶顶出流提出改进措施。结果表明:管网计算与全三维气热耦合计算流量差异约为8.8%,平均温度差异约10.1%,管网计算具有方案设计的功能,管网计算温度场与三维温度场计算平均温度差异约为7.6%,三维温度场计算具有作为管网计算后续温度场细致分析的功能；采用该设计流程能够有效减少冷却结构设计的盲目性,使冷却结构设计更加灵活方便；改进管网计算边界添加方式后叶顶未发生燃气倒灌,叶顶第一除尘孔冷气量为0.715g/s,第二除尘孔冷气量为0.139g/s,尾缘劈缝总流量为1.935g/s,通过改进边界添加方式能够增加管网计算精度。 

Abstract:

In order to design a rotor blade cooling structure in turbo shaft engine, a set of turbine heat transfer design process was applied,and measures to improve the pipe network calculation in accurately simulated flow in tip of blade were proposed. The results show that the flow rate difference between pipe network and the aero-thermal conjugated calculation is about 8.8%, while the difference of average temperature is about 10.1%. Pipe network has the function of program design, the difference of average temperature between pipe network and three-dimensional temperature field calculation is about 7.6%.Three-dimensional temperature field calculation has the function of analyzing the detail of temperature after pipe network. By using this design process the blindness of designing cooling structure can be reduced and design of cooling structure will be more flexible.After improving the method of adding boundary in pipe network, intrusion has not occurred, flow rate in the first dust hole is 0.715g/s, while in the second dust hole is 0.139g/s, the flow rate in trailing edge split is 1.935g/s.By improving the method the accuracy of pipe network calculation can be promoted.