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为了研究不同轴向间距下定常计算与非定常计算间的差异,以表明在涡轮设计中进行非定常计算与分析的必要性,对高负荷低压涡轮级进行了在不同轴向间距下的定常和非定常流动的数值模拟研究,并通过分析动静干涉条件下轴向间距变化对涡轮气动性能的影响并与定常条件下间距变化对气动性能的影响进行对比。结果表明:只有在某个合适的轴向间距范围内,定常计算结果才具有较好的参考价值;轴向间距的增加使得动叶正、负攻角都有减小的趋势,有利于改善动叶的流动状况;非定常流动的动量掺混损失具有其逆效应,它使动叶端部横向压力梯度减弱,二次流损失下降。
In order to study the difference between steady-state calculation and unsteady calculation under different axial distances to show the necessity of unsteady calculation and analysis in the turbine design, the steady-state and high-pressure low-pressure turbine stages under different axial spacings The numerical simulation of unsteady flow is studied. The aerodynamic performance of the turbine is analyzed by analyzing the variation of the axial distance under the static and dynamic interference conditions, and the aerodynamic performance is compared with that under the steady conditions. The results show that the steady-state calculation results have good reference value only within a certain range of axial distance. The increase of axial distance makes the angle of positive and negative angles of rotor blade decrease, Leaf flow conditions; the unsteady flow momentum mixing loss has its inverse effect, which makes the blade lateral pressure gradient weaken the loss of secondary flow decline.