Influence of primary jets and cooling air on combustor flow field and heat release field based on laser diagnostics
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摘要:
采用试验方法研究加温加压条件下（500 K和500 kPa），主燃孔射流及侧壁冷却气富燃-淬熄-贫燃（RQL）燃烧室中复杂旋流液雾火焰的流动、火焰结构。采用粒子图像测速技术( PIV)和平面激光诱导荧光技术( OH-PLIF)同步光学诊断方法从主燃孔射流来流方向获得了多个截面上单头部燃烧室在不同油气比状态下的流动和火焰结构，揭示了侧壁冷却气耦合作用下主燃孔射流的运动轨迹及对流场、释热场作用过程。结果表明：从主燃孔射流来流方向测试得到的试验结果，可以更好地表征主燃孔射流与旋流液雾火焰相互作用。侧壁冷却气会显著改变主燃孔射流形成的中心回流区结构。非反应条件下，随着侧壁冷却气量的提高，回流区负轴向速度范围减小，流场对称性被破坏；反应条件下，冷却气与火焰相互作用导致火焰形态不对称，高油气比时近壁区出现局部淬熄。
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关键词:
- 旋流液雾火焰 /
- 主燃孔射流 /
- 粒子图像测速技术（PIV） /
- 平面激光诱导荧光技术（PLIF） /
- 火焰-壁面冷却气相互作用
Abstract:Experimental methods were employed to investigate the flow field and flame structure of complex swirling spray flames in a rich burn-quench-lean burn (RQL) combustor with a typical primary jet and cooling air under elevated temperature and pressure conditions (500 K, 500 kPa). Simultaneous optical diagnostic techniques (particle image velocimetry, PIV and OH planar laser-induced fluorescence, OH-PLIF) were utilized to capture the flow and flame structures at multiple cross-sections of a single-sector combustor under varying fuel-air ratios conditions, with measurements performed along the incoming flow direction of the primary jets. These pioneering measurements revealed the trajectory of the primary jets and their interaction processes with the flow field and heat release field under the influence of the cooling air. Results indicated that the experimental data acquired along the incoming flow direction of the primary jets more effectively characterized the interaction between the primary jets and the swirling spray flames. The cooling air significantly altered the central recirculation zone formed by the primary jets. Under non-reacting conditions, as the cooling air increased, the negative axial velocity range of the recirculation zone decreased, and flow symmetry was disrupted. Under reacting conditions, the interaction between cooling air and flames led to asymmetric flame structures, with local quenching observed near the wall at a high fuel-air ratio.
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图 2 单头部燃烧室示意图以及从燃烧室不同高度方向测试片光位置
Figure 2. Schematic diagrams of single-sector combustor and the laser sheet locations at various vertical positions
图 3 不同边界条件下的侧壁结构实物图
Figure 3. Schematic diagram of the side wall structure under different boundary conditions
图 4 单头部燃烧室同步PIV/PLIF测试系统展向方向测试系统图和实物图
Figure 4. Schematic and photos of the simultaneous PLIF and PIV system for single-sector combustor from spanwise direction
图 5 加温加压试验系统图
Figure 5. Test system of elevated temperature and pressure combustion experiments
图 6 Case 1～Case 3在中心截面的时均速度流线与轴向速度云图叠加结果图
Figure 6. Time averaged axial velocity contour overlaid with the streamlines on the central plane for Case 1—Case 3
图 7 Case 4～Case 9在中心截面的时均PIV/OH-PLIF和fuel-PLIF的叠加结果云图
Figure 7. Time averaged PIV/OH-PLIF intensity overlaid with streamlines and fuel-PLIF isoline on the central plane for Case 4—Case 9
图 8 Case 1在不同截面的时均速度流线与轴向速度云图叠加结果
Figure 8. Time averaged axial velocity contour overlaid with the streamlines on variable planes for Case 1
图 9 Case 2在不同截面的时均速度流线与轴向速度云图叠加结果
Figure 9. Time averaged axial velocity contour overlaid with the streamlines on variable planes for Case 2
图 10 Case 3在不同截面的时均速度流线与轴向速度云图叠加结果
Figure 10. Time averaged axial velocity contour overlaid with the streamlines on variable planes for Case 3
图 11 Case 4在不同截面的流线、OH-PLIF强度及fuel-PLIF等值线叠加图
Figure 11. Time averaged OH-PLIF intensity overlaid with streamlines and fuel-PLIF isoline on variable planes for Case 4
图 12 Case 5在不同截面的流线、OH-PLIF强度及fuel-PLIF等值线叠加图
Figure 12. Time averaged OH-PLIF intensity overlaid with streamlines and fuel-PLIF isoline on variable planes for Case 5
图 13 Case 6在不同截面的流线、OH-PLIF强度及fuel-PLIF等值线叠加图
Figure 13. Time averaged OH-PLIF intensity overlaid with streamlines and fuel-PLIF isoline on variable planes for Case 6
图 14 Case 7在不同截面的流线、OH-PLIF强度及fuel-PLIF等值线叠加图
Figure 14. Time averaged OH-PLIF intensity overlaid with streamlines and fuel-PLIF isoline on variable planes for Case 7
图 15 Case 8在不同截面的流线、OH-PLIF强度及fuel-PLIF等值线叠加图
Figure 15. Time averaged OH-PLIF intensity overlaid with streamlines and fuel-PLIF isoline on variable planes for Case 8
图 16 Case 9在不同截面的流线、OH-PLIF强度及fuel-PLIF等值线叠加图
Figure 16. Time averaged OH-PLIF intensity overlaid with streamlines and fuel-PLIF isoline on variable planes for Case 9
表 1 工况参数
Table 1. Test conditions
工况 进口压力/kPa 进口温度/K 油气比 方法 侧壁Gc Case 1 50 500 非反应状态 PIV 0 Case 2 0.5 Case 3 1 Case 4 50 500 0.010 PIV/OH-PLIF
fuel-PLIF0 Case 5 0.5 Case 6 1.0 Case 7 50 500 0.027 PIV/OH-PLIF
fuel-PLIF0 Case 8 0.5 Case 9 1.0 
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