Closed-Loop Active Control of Combustion Instabilities Using Subharmonic Secondary Fuel Injection
Closed-Loop Active Control of Combustion Instabilities Using Subharmonic Secondary Fuel Injection
复制标题
使用分谐波二次燃油喷射对燃烧不稳定性进行闭环主动控制
DOI：
10.2514/2.5467
复制
发表时间：
1999
影响因子：
1.9
通讯作者：
D. Santavicca
中科院分区：
文献类型：
--
作者：
C. M. Jones;J. Lee;D. Santavicca
给出了利用次谐波二次燃油喷射进行燃烧不稳定性闭环主动控制的研究结果。试验是在实验室规模的倾卸燃烧室中进行的，在常压下，入口温度为415±C，入口体速度为9.3 m/s，从稀薄爆裂到化学计量条件的燃料-稀薄当量范围为10倍。观测到的失稳为纵向模态失稳，频率为350 Hz。通过在不稳定发动机的每四个循环中使用调制的二次燃油喷射来实现控制。随着燃烧室压力的波动，二次燃料的喷射被锁相，在燃烧室中调节相对相位以达到最大控制。最有效的控制是在0.85的等效比下实现的，其中燃烧产生的噪音水平降低了22 dB，二次燃料排放率仅为一次燃料排放率的2%。
The results of a study of closed-loop active control of combustion instabilities using subharmonic secondary fuel injection are presented. The tests were conducted in a laboratory-scale dump combustor at atmospheric pressure withaninlettemperatureof 415 ± C,aninletbulkvelocity of 9.3 m/s,andovera rangeoffuel-lean equivalenceratios from lean blowout to the stoichiometric condition. The observed instability was a longitudinal mode instability with a frequency of » 350 Hz. Control was achieved using modulated secondary fuel injection on every fourth cycle of the unstable e ame. The injection of secondary fuel was phase-locked with the pressure oscillation in the combustor, where the relative phase was adjusted to achieve maximum control. The most effective control was achieved at an equivalence ratio of 0.85, where the combustion-generated noise level was reduced by 22 dB, with a secondary fuel e ow rate that was only 2% of the primary fuel e ow rate.