CAJ | 학술논문

采用大涡模拟结合多步化学反应模型开展了突扩燃烧室低频燃烧不稳定的主动开环控制方法研究.针对突扩面形成的大尺度旋涡脱落和运动是形成低频燃烧不稳定的主要原因,提出了在突扩截面上放置窄缝进行小流量空气喷射和燃气吸出的方法进行燃烧不稳定的开环主动控制.通过大涡模拟仿真表明,这两种方式都能够比较有效地干扰突扩面上大尺度旋涡的形成和破坏振动能量的正反馈,起到较好的抑制效果,压强振动幅值分别下降了48%和54%.
채용대와모의결합다보화학반응모형개전료돌확연소실저빈연소불은정적주동개배공제방법연구.침대돌확면형성적대척도선와탈락화운동시형성저빈연소불은정적주요원인,제출료재돌확절면상방치착봉진행소류량공기분사화연기흡출적방법진행연소불은정적개배주동공제.통과대와모의방진표명,저량충방식도능구비교유효지간우돌확면상대척도선와적형성화파배진동능량적정반궤,기도교호적억제효과,압강진동폭치분별하강료48%화54%.
Large eddy simulation (LES) coupling with multi-step chemical mechanisms was used to investigate open-loop ac-tive control of low-frequency combustion instabilities in a dump combustor. For large vortex structures shedding from dump planeand propagating play a key role in low frequency unsteady combustion, the air injection and gas suction through small slot on dumpplane were proposed to control combustion instabilities. Simulation results indicate that formation of large scale vortices from dumpplane is effectively destroyed and positive feedback mechanism of oscillation energy is interrupted. Air injection and gas suction areboth effective to suppress pressure oscillations,with their magnitudes decrease by 48% and 54% respectively.