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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非定常性及流场分布的影响,探讨了转子和静子叶片之间的非定常相干的机理.结果表明,轴向间距L对转子内流动的非定常性有着强烈的影响.随着轴向间距的减小,静叶尾迹的强度及影响范围增加,静叶尾迹对动叶的周期性非定常影响还是主要出现在前缘附近.由于静叶尾迹的恢复效应与来流尾迹强度成正比,50%轴向间距下动叶出口流场的湍动能在动叶通道中央区域最小.
Numerical simulations of unsteady flow in a turbine stage with different axial spacings are carried out. The effects of axial spacing variations on unsteady flow field and flow field distribution under unsteady conditions are discussed. The unsteady coherence between rotor and stator blades is discussed The results show that the axial spacing L has a strong influence on the unsteady flow in the rotor.As the axial spacing decreases, the strength and influence range of the stator wake increases, The unsteady influence is still mainly near the leading edge.Because the recovery effect of the wake is proportional to the wake strength, the turbulent energy of the flow field at the exit of the rotor with 50% axial spacing is the smallest in the central region of the moving blade.