• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>ASME turbo expo: turbine technical conference and exposition >THE IMPACT OF REPRESENTATIVE AERODYNAMIC FLOW FIELDS ON LIQUID FUEL ATOMISATION IN MODERN GAS TURBINE FUEL INJECTORS
【24h】

THE IMPACT OF REPRESENTATIVE AERODYNAMIC FLOW FIELDS ON LIQUID FUEL ATOMISATION IN MODERN GAS TURBINE FUEL INJECTORS

机译：代表性的气动流场对现代燃气轮机喷射器中液体燃料气化的影响

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In modern gas turbine engines swirl is typically imparted to the airflow as it enters the region of heat release to stabilize the flame. This swirling airstream is often highly turbulent and contains non-uniformities such as swirl vane wakes. However, it is within this environment that fuel atomization takes place. This paper is concerned with the potential effect of these airstream characteristics on the atomization process. Such a flow field is difficult to capture within simplified geometries and so measurements have been made within, and downstream of, injector representative geometries. This is experimentally challenging and required the application of a variety of techniques. The geometry considered is thought typical of an air-blast style injector, as may be used within current or future applications, whereby liquid fuel is introduced onto a pre-filming surface over which an airstream passes. Data is presented which characterizes the atomizing airstream presented to the pre-filming region. This includes significant flow field non-uniformities and turbulence characteristics that are mainly associated with the swirling flow along with the vanes used to impart this swirl. The subsequent development of these aerodynamic features over the pre-filming surface is also captured with, for example, swirl vane wakes being evident through the injector passage and into the downstream flow field. It is argued these characteristics will be common to many injector designs. Measurements with and without fuel indicate the effect of the liquid film, on the non-dimensional aerodynamic flow field upstream of the pre-filming region, is minimal. However, the amount of airflow passing through the pre-filming passage is affected. In addition to characterization of the airstream, its impact on the liquid fuel film and its development along the pre-filming surface is visualized. Furthermore, PDA measurements downstream of the fuel injector (i.e. the injector 'far-field) are presented and the observed spray characteristics spatially correlated with the upstream aerodynamic atomizing flow field. Hence for the first time a series of experimental techniques have been used to capture and correlate both near and far field atomization characteristics within an engine representative aerodynamic flow field.
机译：在现代的燃气涡轮发动机中，当气流进入放热区域以稳定火焰时，通常将漩涡赋予气流。这种涡旋气流通常是高度湍流的，并且包含不均匀性，例如涡旋叶片尾流。但是，正是在这种环境下发生了燃料雾化。本文关注这些气流特性对雾化过程的潜在影响。这样的流场难以捕获在简化的几何形状内，因此已经在喷射器代表性几何形状内和下游进行了测量。这在实验上具有挑战性，需要多种技术的应用。所考虑的几何形状被认为是鼓风型喷射器的典型几何形状，可以在当前或将来的应用中使用，由此将液体燃料引入气流通过的预成膜表面上。呈现数据，该数据表征呈现给预成膜区域的雾化气流。这包括显着的流场不均匀性和湍流特性，这些特性主要与回旋流以及用于产生该回旋的叶片一起与回旋流有关。这些空气动力学特征在预成膜表面上的后续发展也被捕获，例如，旋涡叶片尾流通过喷射器通道并进入下游流场是明显的。有人认为，这些特性对于许多喷油器设计都是通用的。有燃料和无燃料的测量表明，液膜对预成膜区域上游的无量纲空气动力流场的影响极小。然而，通过预成膜通道的气流量受到影响。除了表征气流外，还可以看到气流对液体燃料薄膜的影响以及其沿预成膜表面的发展情况。此外，给出了燃料喷射器下游的PDA测量值（即喷射器的远场），并且所观察到的喷雾特性与上游空气动力学雾化流场在空间上相关。因此，第一次将一系列实验技术用于捕获并关联发动机代表的空气动力流场内的近场和远场雾化特性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号