Numerical simulation and mechanism of flame flashback process based on model combustor
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摘要:
以旋流预混模型燃烧室为对象，基于试验手段获得了不同压力下航空煤油预混火焰的回火发生边界条件及其动态过程。以此为基础，基于雷诺平均方法，利用realizable
k-ε 及小火焰生成模型（FGM），数值地复现了回火发生的临界状态。数值计算获得的回火压力边界与试验结果相比，误差不超过10%。利用大涡模拟方法，精细化再现了典型工况下回火的发生和发展过程。分析表明，下游压力增加引起预混通道出口附近压力和密度脉动耦合变化，产生具有负速度区的逆向涡旋。下游压力持续增大使逆向涡旋增大，将预混通道外的热焰带入通道内，诱发回火。进一步，在斜压梯度的作用下，预混通道内的火焰不断向上游传播。Abstract:The boundary conditions and propagation process of flame flashback were experimentally obtained for aviation kerosene at different pressures in a premixed swirl model combustor. The reliable
k -ε model of Reynolds average Navier-Stokes method, coupled with flamelet generated method (FGM), was applied to numerically capture the flame flashback. It was shown that the simulated critical pressure conditions were within 10% errors compared with the experimental results. Then the large eddy simulation method was used to reproduce the flame flashback process in detail. The analysis showed that the combination of fluctuations of pressure and density in the region near the exit of premix tube caused by increase of downstream pressure yielded reverse eddy with minus speed. As the reversed eddy was enlarged with the increase in downstream pressure, the hot flame outside the exit of premix tube was brought into the tube, which induced flame flashback. Then the flame in the premix tube propagated upstream due to the influence of baroclinic pressure. -
图 6 进口总压及燃烧室进口流速随时间的变化
Figure 6. Variation of total inlet pressure and inlet velocity of combustion chamber with time
图 7 预混通道壁面处某点温度随时间变化
Figure 7. Temperature change with time at a certain point on the wall of premixed channel
图 8 高速摄影仪拍摄的回火过程（单位：h:min:s）
Figure 8. Flame flashback process photographed by high-speed camera （unit: h:min:s）
图 12 y=0 mm截面中轴线径向速度分布
Figure 12. Axial velocity distribution of axis in section y=0 mm
图 15 回火时中心截面温度分布
Figure 15. Temperature distribution of central section during flame flashback
图 19 不同时刻y=0 mm中心截面CH*质量分数分布
Figure 19. CH*distribution in the central section of y=0 mm at different times
图 20 t0+0.1、t0+1.3、t0+2.1 ms时刻下1800 K的等温面
Figure 20. Instantaneous isosurfaces of T=1800 K at different times
图 21 y=0 mm中心截面预混通道出口处局流线图
Figure 21. Streamline at the outlet of premixed channel of y=0 mm central section
图 25 各监测点轴向速度随时间变化规律
Figure 25. Axial velocity profile along time at all monitor points
图 27 t=12.9～13.1 ms 1800 K瞬时等温面随时刻变化
Figure 27. t=12.9～13.1 ms Instantaneous isosurfaces of 1800 K at different times
表 1 回火临界压力比较
Table 1. Flame flashback boundary pressure
工况 回火临界压力/kPa 误差/% 试验 RANS 1 379 390 3.1 2 380 398 4.7 3 391 401 2.6 4 448 469 4.8 5 434 440 1.4 6 261 262 3.8 7 261 266 2.0 8 285 265 7.1 
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