Experimental study on the effect of two-stage radial spacing on flow field and atomization in LDI staged combustor
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摘要: 主燃级旋流器与预燃级旋流器之间的径向间距是贫油直喷分级燃烧室一个非常重要的结构参数。本文利用粒子图像测速、平面激光PMie散射和粒径测量技术对3种不同径向间距条件下的流场和雾化特性进行实验研究。结果表明：在常温常压下，随着主/预燃级径向间距的增大，中心回流区由前窄后宽向前后宽度相同转变，两级间回流区不断增大；预燃级燃油锥角受径向间距影响较小，在空气压降的影响下，主燃级直喷燃油射流由向主燃级区域偏转转为向预燃级区域偏转，主油路雾化效果变差。主/预燃级径向间距为20 mm时，主油路和副油路都能获得较好的雾化效果。Abstract: The radial spacings of the primary and pilot staged swirler is an important parameter for the lean direct injection combustor. In this paper, the particle image velocimetry technology, Mie scattering technology and particle size measurement technology were used to study the cold flow and spray characteristics under three different radial spacings of the primary and pilot stage. The experimental results show that, under normal temperature and pressure, with the increase of two-stage radial spacing, the central reflux area changes from narrower in front and wider in back to the same width in front and back, the backflow zone between the two stages keeps increasing, the fuel cone angle of the pilot stage is less affected, the main stage jet deflects gradually from the main stage to the pilot stage, and the main fuel crushing effect continues to deteriorate. When the radial spacing of the two-stage is 20 mm, the atomization effect of the main fuel is the best, and the atomization effect of the secondary fuel is also good.
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Key words:
- central staged /
- lean direct /
- fluid field /
- swirling air /
- spray characteristic
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表 1 主燃级和预燃级的结构参数
Table 1. Structural parameters of main stage and pilot stage
参数名称 数值 主油路喷射角度 15° 主燃级旋流角度 60° 主燃级出口收敛角度 50° 主燃级出口喷嘴直径 0.482 mm 副油路喷射角度 80° 预燃级旋流角度 32° 预燃级出口收敛角度 45° 预燃级出口喷嘴直径 0.320 mm 
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表 2 常温常压实验工况
Table 2. Experimental conditions at normal temperature and pressure
参数 单独副油路 单独主油路 火焰筒进口总温t/K 300 300 火焰筒进口总压p0/Pa 101325 101325 压力损失/% 3.30% 3.30% 压降/Pa 3343.7 3343.7 空气流量$ {\mathit{m}}_{\rm{air}} $/(kg·h−1) 273.6 273.6 副油路燃油流量mf/（kg·h−1) 10.8 0 主油路燃油流量mz/(kg·h−1) 0 32.4 燃烧室入口轴向速度vx,0/(m·s−1) 30 30
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表 3 不同主/预燃级径向间距下的预燃级燃油喷雾锥角 （∆p = 3.3%）
Table 3. Pilot stage fuel cone angle of different cyclone structures (∆p = 3.3%)
主预燃级径向间距/mm 角度/(°) 未通气 70.3 23 59.5 20 59.8 25 60.4
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