To study how the geometry of the plenum chamber in the bleed system of an axial compressor influences the losses therein and to establish a theoretical loss model for this system, a 1.5-stage axial compressor with a bleed system is studied numerically by means of computational fluid dynamics (CFD). The results show that losses in the bleed system occur mainly in the axisymmetric bleed slot and plenum chamber, accounting for ca. 85% of the total loss. For a bleed system with a vertical axisymmetric slot, the loss is more sensitive to the radial height than to the axial width of the plenum chamber. A loss model for each part of the bleed system is established via theoretical analysis, and then, a model of the overall bleed system is established by combining these submodels. The predictions of the theoretical loss model agree well with the CFD results: the maximum prediction error for the coefficient of the stagnation pressure loss in the bleed system is −1.38%, and the average prediction error is −0.8%. This loss model can be used when designing the geometry of a bleed system.

中文翻译：

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增压室几何形状对轴流压缩机排气系统损失的影响

为研究轴流压气机引气系统增压室几何形状对其损失的影响，并建立该系统的理论损失模型，利用计算流体对带引气系统的1.5级轴流压气机进行数值研究。动力学（CFD）。结果表明，泄放系统中的损失主要发生在轴对称泄放槽和增压室中，占约。总损失的 85%。对于具有垂直轴对称槽的排放系统，损失对径向高度比对增压室的轴向宽度更敏感。通过理论分析建立排放系统各部分的损失模型，然后结合这些子模型建立整个排放系统的模型。理论损失模型的预测与CFD结果吻合良好：引气系统滞流压力损失系数的最大预测误差为-1.38%，平均预测误差为-0.8%。在设计排放系统的几何形状时可以使用此损失模型。