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针对不同轴向间距下涡轮级内非定常流动进行了数值研究,讨论了非定常条件下轴向间距变化对气动损失、非定常性的影响.结果表明,随着轴向间距的减小,涡轮级内流动的非定常性增大,流动的不均匀性更为强烈.大轴向间距方案的尾迹同主流区域的流体掺混距离较长,表现出大的总压损失系数的分布.小轴向间距下流动的不均匀性非常强烈,因而也表现出较高的损失分布.存在一个最优的轴向间距使得气动损失最小.
Numerical simulations of unsteady flow in a turbine stage with different axial spacings are carried out. The effects of axial spacing variations on aerodynamic losses and unsteady behavior under unsteady conditions are discussed. The results show that with the decrease of axial spacing, The unsteady flow in the stage increases and the flow inhomogeneity is more intense.The large axial distance scheme has a longer mixing distance with the fluid in the main flow area and shows a large distribution of total pressure loss coefficient.The small shaft The inhomogeneity of flow to the pitch is very strong and therefore also shows a high loss distribution. There is an optimal axial spacing that minimizes the aerodynamic losses.