Analysis of transient radiation-convection coupled effects on the HP turbine blade heat load with hot streak inlet
Analysis of transient radiation-convection coupled effects on the HP turbine blade heat load with hot streak inlet
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DOI：
10.1016/j.applthermaleng.2018.04.110
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发表时间：
2018-06
影响因子：
6.4
通讯作者：
Tianyi Wang;Y. Xuan;Xingsi Han
中科院分区：
文献类型：
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作者：
Tianyi Wang;Y. Xuan;Xingsi Han
热斑和热辐射是影响高压涡轮机级传热过程的两个重要因素，以往的研究多局限于单独研究热斑和热辐射。为了研究HS和辐射的综合效应，本研究的目的是非定常对流-辐射耦合模拟与HS和均匀的入口条件。详细分析了三个主要的辐射因子。通过与均匀工况的比较，发现高速工况下转子通道内存在两个高温区。叶片表面的最大温升约为40 K。当HS改变温度分布时，辐射热通量被重新分配，并且一部分辐射热通量从定子通道传递到转子通道。涡轮机进口辐射主要影响导叶，而燃气辐射对动叶热负荷的影响更为显著。
Hot Streak (HS) and thermal radiation are the two important factors affecting the heat transfer process in High Pressure (HP) turbine stage, while the previous investigations were limited in studying either of them independently. In order to investigate the combined effects of the HS and radiation, the present study is aimed at unsteady convection-radiation coupled simulations with regards to HS and uniform inlet conditions. Three dominant radiative factors were analyzed in details. Compared with the uniform cases, it is found that there are two high temperature regions in the rotor passages of HS cases. The maximum temperature increase of the vane surface is about 40 K caused by radiation. As the HS changes the temperature distribution, the radiative heat flux is redistributed and a portion of radiative heat flux transfer from the stator passage to the rotor passage. The turbine inlet radiation mainly affects on the guide vane, whereas the gas radiation has a more significant influence on the rotor blade heat load.