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本文旨在提出一种能够考虑叶栅内部径向压力梯度影响的计算喷咀叶栅根部损失的方法。为此,在环形喷咀叶栅中,通过改变叶栅径向压力梯度,对马赫数M_(1H)=0.48～0.56范围内,计算和测量了喷咀流道内的压力分布,实测了不同径向压力梯度下叶片根部损失的变化。计算采用有限元方法,并近似地分段考虑了流动熵增积累效应。计算和实验表明,在实验范围内,径向压力梯度对根部二次流损失的影响仍然是可观的,必须加以考虑。
The purpose of this paper is to propose a method to calculate the root loss of the nozzle cascade that takes into account the influence of the radial pressure gradient inside the cascade. Therefore, in the annular nozzle cascade, the pressure distribution in the nozzle flow path was calculated and measured for the Mach number M_ (1H) = 0.48 ~ 0.56 by changing the radial pressure gradient of the cascade. Variations of leaf root loss to pressure gradient. The finite element method was used in the calculation, and the cumulative effect of entropy increase was approximated by stages. Calculations and experiments show that the influence of radial pressure gradient on root secondary loss in the experimental range is still considerable and must be considered.