Numerical Investigation on Unsteady Effects of Hot Streak on Flow and Heat Transfer in a Turbine Stage
Numerical Investigation on Unsteady Effects of Hot Streak on Flow and Heat Transfer in a Turbine Stage
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DOI：
10.1115/1.2988172
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发表时间：
2009-07
影响因子：
1.7
通讯作者：
B. An;Jianjun Liu;Hongde Jiang
中科院分区：
文献类型：
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作者：
B. An;Jianjun Liu;Hongde Jiang
本文对燃气轮机第一级透平在热连进气条件下的流动和换热特性进行了详细的分析。在透平级进口处规定了两种进口总温条件。第一种是均匀进口总温，第二种是热连2D总温等值线。两种进气条件具有相同的质量平均总温和相同的均匀进气总压。根据环形罐燃烧室出口形状，得到了热痕总温等值线。热条纹最高总温与质量平均总温度之比约为1.23，一个热条纹对应两个叶片通道和四个叶片通道。计算和分析了相对于叶片1前缘的6个热痕周向位置，节距从−2%到81%不等。结果表明，与均匀总温进气条件相比，热痕明显增加了叶片热负荷的不均匀程度。热痕周向位置的变化导致了定子出口周向参数的变化，也导致了转子叶片表面热负荷和压力的不同的暂态周期波动特性。相对螺距为65%的热条纹对两个叶片产生相似的热负荷，对应于一个热条纹，而转子叶片上的平均热负荷波动较小。
This paper presents a detailed flow and heat transfer characteristic analysis on gas turbine first-stage turbine under hot streak inlet conditions. Two kinds of inlet total temperature conditions are specified at the turbine stage inlet. The first is uniform inlet total temperature, and the second is hot streak 2D total temperature contour. The two kinds of inlet conditions have the same mass-averaged total temperature and the same uniform inlet total pressure. The hot streak total temperature contours are obtained according to the exit shape of an annular-can combustor. The ratio of the highest total temperature in the hot streak to the mass-averaged total temperature is about 1.23, and one hot streak corresponds to two vane passages and four blade passages. Six hot streak circumferential positions relative to the Vane 1 leading edge varied from −2% to 81% pitch are computed and analyzed. The results show that hot streak obviously increases the nonuniform degree of vane heat load in comparison with the uniform total temperature inlet condition. The change in hot streak circumferential position leads to the circumferential parameter variation at stator exit and also leads to different transient periodic fluctuating characteristics of heat load and pressure on the rotor blade surface. The hot streak of relative pitch at 65% obtains a similar heat load for the two vanes corresponding to one hot streak and small fluctuation in the averaged heat load on the rotor blade.