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首页> 外文会议>ASME(American Society of Mechanical Engineers) Turbo Expo vol.1; 20060506-11; Barcelona(ES) >THE FLOWFIELDS IN A MODEL COMBUSTOR WITH PRIMARY HOLES AFTER DIFFERENT SWIRL CUPS
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THE FLOWFIELDS IN A MODEL COMBUSTOR WITH PRIMARY HOLES AFTER DIFFERENT SWIRL CUPS

机译：不同旋流后带初级孔的模型燃烧器中的流动

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摘要

The characteristics of the flow fields in a model combustor's primary zone, which is confined by different swirl cups and the flame tube with primary holes and cooling air films, is experimentally investigated by a Particle Dynamic Analyzer (PDA). The spray of RP-3 jet fuel from the atomizer is used as the trace particles for laser detection. The inlet air pressure and temperature are 110 KPa and 300 K, respectively. The test sections start from 10 mm and end at 50 mm downstream the swirl cup, ensuring that the primary holes are located within the test range. The results show that the swirl cup with double radial swirlers causes a greater flow expansion than that with double axial swirlers, thus results in a greater recirculation zone. By comparison with the previously reported data for the flow field after a pure swirl cup, it can be concluded that the flow field, especially the recirculation zone, in the primary zone with primary hole jets, is no longer axisymmetrical, as it was after a pure swirl cup. The presence of primary hole air flows remarkably squeezes the recirculation zone, especially for double radial swirlers; thus resulting in a elliptic-like cross section, with the longer axis greater than the shorter one up to 2.3 times, and causing the diminish of the corner recirculation zone. The recirculation zone is always ended at the primary holes, resulting in a much shorter length of the recirculation zone, which is only about 1.3 times of the exit diameter of the swirl cup, instead of 2.5 times for the pure swirl cup structure without the primary holes.
机译：使用粒子动力分析仪（PDA），通过实验研究了模型燃烧器主要区域的流场特性，该区域受不同的涡流杯和带有主要孔和冷却空气膜的火焰管限制。来自雾化器的RP-3喷气燃料的喷雾用作激光检测的痕量颗粒。进气压力和温度分别为110 KPa和300K。测试部分从涡旋杯下游10毫米开始，到涡旋杯下游50毫米结束，确保主要孔位于测试范围内。结果表明，带有双径向旋流器的旋流杯比带有双轴向旋流器的旋流杯产生更大的流动膨胀，从而导致更大的再循环区域。通过与先前报告的纯旋流杯流场的数据进行比较，可以得出结论，流场，尤其是在带有主孔射流的主区域中的回流区，不再像是经过一次轴流之后是轴对称的。纯漩涡杯。初级孔气流的存在显着地挤压了再循环区域，特别是对于双径向旋流器而言；这样就形成了椭圆形的横截面，其长轴大于短轴，最大可达2.3倍，并导致转角再循环区域减小。再循环区始终在初级孔处终止，从而使再循环区的长度短得多，仅为再循环杯出口直径的1.3倍，而不是没有初级的纯旋杯结构的2.5倍。孔。

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