Effect of incidence on the flow field in turbine static cascade
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摘要: 为了研究亚临界600MW汽轮机高压第九级静叶原型和改型叶栅的变冲角气动特性,对两套环形叶栅在0°和±10°冲角下在哈尔滨工业大学能源科学与工程学院的低速环形风洞中进行了对比实验研究.实验结果表明,冲角变化仅影响改型和原型叶栅流道前半部分的横向压力梯度,对流道后半部分的流动影响不大;与原型叶栅相比较,改型叶栅不仅降低了流动损失,而且比原型叶栅具有更好的变冲角特性.Abstract: To investigate the aerodynamic characteristics under the different incidences of original and modified designed high pressure static cascades used in the 9th stage of 600MW subcritical steam turbine,the two types of annular turbine cascades were studied in the low speed wind tunnel of HIT under the 0°and ±10°incidences.The test results show that the different incidences only effected on the transverse pressure gradient near the front half part of the flow passage of two cascades,the flow near the rear half part of passage was almost not changed.And compared with the original designed cascade,the modified designed cascade not only reduced the flow loss,but also had the better incidence adaptability.
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