燃气轮机燃烧室新型双相空气喷射器喷雾分布及燃料位置研究

2019/08/19   下载量： 0 次

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采用美国Artium 公司的PDI-200型相位多普勒粒子干涉仪，对燃气轮机燃烧室新型双相空气喷射器喷雾的液滴粒径和SMD的空间分布及其与燃料的位置关系进行了实验测量研究。

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    A novel airblast injector is designed for gas turbine combustors. Unlike standard pressure swirl and prefilming/non-prefilming air blast atomizers, the novel injector has a porous stainless steel tube with 7um porosity. The porous tube is used to inject the fuel between two air streams. The advantage of such an injector is that it can increase the surface area of contact between the fuel and air by forming a thin liquid sheet along the circumference of the tube which will enhance the distribution the fuel more effectively, and produce a fine spray at engine idle conditions. The injector can also be used to inject simultaneously both liquid and gaseous fuels. An experimental approach is adopted in the present study to characterize initially the spray and fuel placement emanating from this injector. The fuel injector consists of two streams of air, viz. through inner section of the tube and another swirling stream merging downstream of the tube. Jet-A fuel is injected through the surface of the porous tube. Due to the permeability of the tube, a thin liquid sheet is produced along the tube which is atomized by the inner airstream by surface stripping of the liquid sheet. Further, a secondary breakup occurs downstream of the tube. The swirl vane angle and air split are selected to increase the amount of air through the tube and enhance the atomization. Flow visualization studies show a hollow conical spray. Patternator tests are carried out to study the fuel distribution and symmetry of the spray. The results show a hollow cone spray with asymmetric distribution of volume flux. Spray characterization is further car-ried out with PDPA at selected operating conditions. The measured SMD shows that the atomization is reasonably good with wide fuel placement downstream of the atomizer at atmospheric conditions.

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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