高旋转雷诺数下预旋进气转-静盘腔流动换热特性
Flow and Heat Transfer in a Pre-Swirl Rotor-Stator Cavity under High Rotational Reynolds Number
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摘要: 运用RNG k-ε湍流模型对高旋转雷诺数和预旋进口速度下,静盘外缘预旋进气、转盘外缘轴向出流模型的流动和换热过程进行了三维数值模拟,主要研究了冷气流量Cw、旋转雷诺数R ee等参数对转盘对流换热系数和出流口温度分布的影响,并与垂直进气方式进行了对比。研究表明:预旋进气方式与垂直进气相比可降低涡轮叶片冷气入口总温;冷气流量增大以及旋转雷诺数增大均使得转盘平均换热增强;涡轮叶片入口温度随冷气流量增大而降低,随着旋转雷诺数的增大先升高后降低。Abstract: A three-dimensional numerical study of the flow and heat transfer characteristics of a pre-swirl rotor-stator system equipped with a series of pre-swirl nozzles of circular cross-section was carried out.Pre-swirl nozzles were located on the outer rim of a stator disk with a radius equal to that of the rotor blade inlet holes.The RNG k-ε turbulent model was used for the simulation under the condition of high rotational Reynolds Number and throughflow rate.The convective heat transfer coefficients of the rotor and temperature distributions at the blade inlet holes were obtained for different non-dimensional throughflow rates and rotational Reynolds Numbers under a given swirl angle.The computational data were compared with that of a simple straight air inflow model.The results show that the cooling air total temperature entering the rotor blade holes is obviously lower with the pre-swirl nozzles compared to the straight nozzles without pre-swirl.The convective heat transfer is enhanced inside the cavity by increasing the non-dimensional throughflow rates and rotational Reynolds Number.And the cooling air temperature entering the rotor blade holes decreases with the increase of the non-dimensional throughflow rates,whereas it goes up and then drops down with the increase of the rotational Reynolds Number.
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Key words:
- aerospace propulsion system /
- pre-swirl /
- rotor-stator cavity /
- flow /
- heat transfer /
- numerical calculation
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