Compressor Exit Conditions and Their Impact on Flame Tube Injector Flows
Compressor Exit Conditions and Their Impact on Flame Tube Injector Flows
复制标题
压缩机出口条件及其对火焰管喷射器流量的影响
DOI：
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发表时间：
2002
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
在燃气涡轮机发动机内，从压缩系统流出的流场是不均匀的，包括例如由于来自上游压缩机出口导叶（OGV）的尾流而引起的流场的周向和径向变化。此外，由于在预扩压器内存在径向承载支柱，可能出现变化。本文关注的是这种不均匀的流场的表征，在燃烧系统之前，以及随后对火焰管燃料喷射器流动和燃烧过程的影响。一个主要的实验研究已经进行了使用一个全环形的测试设备，其中包括一个单级轴流压气机，扩压器，和火焰管。测量了倾倒腔内的流场及其频率成分。此外，在上游OGV/预扩压器组件的不同周向位置处，获得了喷油器的核心、外部和圆顶旋流器通道的滞止压力。这些压力变化，总计高达燃料喷射器两端压降的20%，也会影响喷射器下游的流场。此外，由于例如燃料喷射器相对于预扩压器出口和火焰管出口的位置，还观察到燃料喷射器周围的压力的一般变化。
Within a gas turbine engine the flow field issuing from the compression system is nonuniform containing, for example, circumferential and radial variations in the flow field due to wakes from the upstream compressor outlet guide vanes (OGVs). In addition, variations can arise due to the presence of radial load bearing struts within the pre-diffuser. This paper is concerned with the characterization of this nonuniform flow field, prior to the combustion system, and the subsequent effect on the flame tube fuel injector flows and hence combustion processes. A mainly experimental investigation has been undertaken using a fully annular test facility which incorporates a single stage axial flow compressor, diffuser, and flame tube. Measurements have been made of the flow field, and its frequency content, within the dump cavity. Furthermore, the stagnation pressure presented to the core, outer and dome swirler passages of a fuel injector has been obtained for different circumferential positions of the upstream OGV/pre-diffuser assembly. These pressure variations, amounting to as much as 20 percent of the pressure drop across the fuel injector, also affect the flow field immediately downstream of the injector. In addition, general variations in pressure around the fuel injector have also been observed due to, for example, the fuel injector position relative to pre-diffuser exit and the flame tube cowl.