The Impact of Compressor Exit Conditions on Fuel Injector Flows
The Impact of Compressor Exit Conditions on Fuel Injector Flows
复制标题
压缩机退出条件对喷油器流量的影响
DOI：
10.1115/1.4007025
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Ford C
中科院分区：
文献类型：
--
作者：
Ford C
本文研究了压气机产生的进气条件对通过稀燃喷油器的气流均匀性的影响。喷射器流场的任何不均匀性都会影响局部燃油空气比，从而影响排放性能。考虑的几何形状是典型的稀薄燃烧系统，目前正在提出的未来，低排放航空发动机。最初，采用雷诺平均纳维尔-斯托克斯（RANS）计算流体动力学（CFD）预测来研究压气机出口和喷油器入口之间的流场发展。这使得该区域的主流场特征能够沿着被喷油器通道捕获的各种流管的识别而被表征。预测表明，进入喷油器通道的流场是不均匀的。这在离喷射器中心线最远的环形通道中特别明显，该环形通道通过随后在火焰管内形成主反应区的大部分气流。详细的实验测量也进行了一个完整的环形设施，包括轴流压缩机和稀燃燃烧系统。在接近大气压/温度和非反应条件下获得测量。在不同位置获得了时间分辨和时间平均数据，包括从不同喷油器通道流出的流场测量值。通过这种方式，可以量化这些流场中的任何不均匀性。结合数值计算结果，分析了喷射器出口面不均匀性的来源。例如，喷油器流场的大尺度整体变化（+/−10%）归因于喷油器上游流场的发展，而局部变化（+/−5%）则由喷油器旋流叶片尾流产生。使用这些数据，可以评估对燃料喷射器排放性能的潜在影响。
This paper examines the effect of compressor generated inlet conditions on the air flow uniformity through lean burn fuel injectors. Any resulting nonuniformity in the injector flow field can impact on local fuel air ratios and hence emissions performance. The geometry considered is typical of the lean burn systems currently being proposed for future, low emission aero engines. Initially, Reynolds-averaged Navier-Stokes (RANS) computational fluid dynamics (CFD) predictions were used to examine the flow field development between compressor exit and the inlet to the fuel injector. This enabled the main flow field features in this region to be characterized along with identification of the various stream-tubes captured by the fuel injector passages. The predictions indicate the resulting flow fields entering the injector passages are not uniform. This is particularly evident in the annular passages furthest away from the injector centerline which pass the majority of the flow which subsequently forms the main reaction zone within the flame tube. Detailed experimental measurements were also undertaken on a fully annular facility incorporating an axial compressor and lean burn combustion system. The measurements were obtained at near atmospheric pressure/temperatures and under nonreacting conditions. Time-resolved and time-averaged data were obtained at various locations and included measurements of the flow field issuing from the various fuel injector passages. In this way any nonuniformity in these flow fields could be quantified. In conjunction with the numerical data, the sources of nonuniformities in the injector exit plane were identified. For example, a large scale bulk variation (+/−10%) of the injector flow field was attributed to the development of the flow field upstream of the injector, compared with localized variations (+/−5%) that were generated by the injector swirl vane wakes. Using this data the potential effects on fuel injector emissions performance can be assessed.
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