Influence of Compressor Exit Conditions on Combustor Annular Diffusers, Part 1: Diffuser Performance
Influence of Compressor Exit Conditions on Combustor Annular Diffusers, Part 1: Diffuser Performance
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压缩机出口条件对燃烧室环形扩压器的影响，第 1 部分：扩压器性能
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
J. F. Carrotte
中科院分区：
文献类型：
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作者：
A. G. Barker;J. F. Carrotte
在燃气涡轮发动机中，必须降低从压缩机排出的空气速度，以允许下游燃烧室的有效操作。这部分是通过在压气机出口导叶（OGV）后面放置环形扩压器来实现的，在现代系统中，该扩压器的入口通常位于叶栅的后缘。这些组件之间发生的相互作用，特别是对测得的扩散性能的影响进行了研究。在一台由单级轴流压气机和模拟喷管组成的全环形装置上进行了实验研究。此外，可在OGV排的下游立即安装一个面积恒定的通道或面积比为1.45或1.60的扩压器。结果表明，在实验误差范围内，扩压器对OGV叶片通道内的流动影响不大。然而，OGV叶片排产生的叶型，主要是由于叶片变形，包含了相对大量的动能。因此，即使在下游恒定面积通道内，当这些尾流混合时，也会观察到显著的斜面压力升高。附加压力与下游扩压器一起引入，但实验数据分析表明，无论是在滞止压力损失还是静压上升方面，这些压力对尾流混合过程的影响都是有限的。因此，在每个扩压器的进口和出口之间测得的总静压升大于使用设计图表预测的静压升，设计图表使用更传统的轴对称进口条件获得。这一锥体证实了以前的工作，人们认为尾流混合可以提高扩压器的性能。
In gas-turbine engines, the velocity of air issuing from the compressor must be reduced to permit effective operation of the downstream combustor. This is partly achieved by locating an annular diffuserbehind the compressor outlet guide vanes (OGV) and, in modern systems, the inlet of this diffuser is usually located at the trailing edge of the blade row. The interactions that occur between these components and, in particular, the impact on the measured diffuser performance are studied. A mainly experimental investigation has been undertaken in a fully annular facility that incorporates a single-stage axial-e ow compressor and simulated e ame tube. In addition, a constant-area passage, or diffusers of area ratio 1.45 or 1.60, can be incorporated immediately downstream of the OGV row. The results indicate that, within experimental error, the diffusers have little effect on the e ow within the OGVbladepassages. However,theOGV blade rowproducesa proe lethat, duemainly to thebladewakes,contains a relatively large amount of kinetic energy. Hence, even within the downstream constant area passage a signie cant pressure rise is observed as these wakes mix out. Additional pressure forces are introduced with the downstream diffusers present, but analysis of the experimental data indicates these have a limited effect on the wake mixing process, both in terms of stagnation pressure loss and static pressure rise. Hence, the overall static pressure rise measured, between the inlet and exit of each diffuser, is greater than that predicted using design charts obtained using more conventional axisymmetric inlet conditions. This cone rms previous work where it was thought that wake mixing can enhance diffuser performance.