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对蒸发式火焰稳定器结构的模型燃烧室进行了燃烧不稳定性实验。实验中选取了3个当量比,分别为0.4545,0.5454,0.6363。每一个当量比中,值班级供油的比例从2%变化到36%,间隔为2%。利用动态压力传感器测量了不同当量比以及不同值班级供油比例时燃烧室内动态压力的频率和振幅。为了进行对比,在以上3个当量比时,也对普通V型稳定器进行了实验。结果显示,蒸发式稳定器激发了130Hz和203Hz两个不稳定模态。V型稳定器只激发了203Hz一个不稳定模态。总当量比不变时,随值班级供油比例的增加,除当量比0.6363工况的203Hz模态振幅呈现减小趋势,其他燃烧不稳定性模态的振幅均先增大后减小。对燃烧室进行了一维声学模态分析,130Hz和203Hz模态分别为系统的第2和第3阶纵向模态。
The combustion instability experiment of the model combustion chamber of the evaporative flame stabilizer was carried out. Three equivalence ratios were selected in the experiment, which were 0.4545, 0.5454 and 0.6363 respectively. For each equivalence ratio, the ratio of class fueling varied from 2% to 36% with an interval of 2%. The dynamic pressure sensor was used to measure the dynamic pressure amplitude and frequency in the combustion chamber with different equivalence ratios and fuel ratio of different classes. For comparison, the normal V-type stabilizer was also tested at the above 3 equivalent ratios. The results show that the evaporative stabilizer stimulates two unstable modes of 130Hz and 203Hz. The V-type stabilizer excites only one unstable mode at 203Hz. When the total equivalence ratio is invariable, the amplitude of 203Hz modal decreases with the increase of the fueling ratio of duty class except that the 203Hz modal amplitude of the 0.6363 case increases and then decreases. One-dimensional acoustic modal analysis of the combustion chamber was performed. The 130Hz and 203Hz modalities were the 2nd and 3rd longitudinal modes, respectively.