摘要
为了解盘缘流动与换热特性,采用共轭换热数值方法,求解了涡轮盘缘的温度分布状况,揭示了冷气流量及涡轮盘转速对盘腔漩涡分布以及盘面换热特性的影响规律,结果表明:随着冷气量增加,转盘附近主次流掺混区消失,静盘封严环出现间隙涡,盘缘外环面沿流动方向出现盘面向流体导热-流体向盘面导热2个区域;冷气量增加有效隔绝了主流燃气与盘缘外环面,盘缘平均温度降低,盘缘表面努赛尔数随之增加;涡轮盘旋转使得粘性底层减薄,努赛尔数绝对值略有增加;哥氏力抑制了转盘边界层流体周向速度,但总体上哥氏力不是影响旋转盘换热强度的主要因素。
To study the hot gas ingress and the thermal protection of the turbine rim seal,the temperature distribution in the turbine disk was obtained,the cooling air mass flow and the rotation speed,which makes effect on the vortex distribution in the cavity and the heat transfer characteristics of the turbine rim seal, were investigation based on the Conjugate heat transfer( CHT) numerical method. The results show that: As the cooling air mass flow increases,the mixing zone near the rotor is disappearing,while the vortex which is near the stator is appearing,it will generate 2 zones where heat transfer direction is opposite in the turbine rim seal outer torus.Turbine disk is isolated effectively with the hot gas with the cooling air mass flow increasing,which makes the average temperature of the turbine disk decrease,and finally the Nu of the turbine disk increases. The thickness of viscous sublayer decreases because of the increase of the rotation speed,which makes the Nu of the turbine disk increase slowly. Coriolis force inhibits the increase of the tangential velocity of the boundary layer,but it is not the main factor in making an effect on heat transfer intensity of the turbine disk.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2017年第S1期113-119,共7页
Journal of Northwestern Polytechnical University
关键词
盘缘封严
燃气入侵
共轭换热
努赛尔数
turbine rim seal
ingestion
conjugate heat transfer(CHT)
Nusselt number