带驻涡凹腔的径向钝体稳定器燃烧特性研究

In view of the combustion needs of low-pressure tissue combustion in the high-speed air flow of the combustion chamber，this paper analyzes the combustion performance of the combined structure of trapped vortex cavity and radial flameholder，and provides support for the optimal design of flame transmission and flame stabilization structure of the vortex combustion chamber. Through experimental method and numerical simulation，the combustion efficiency of combined stabilizer structure，outlet temperature distribution，and thermal flow field were studied under the negative pressure of 0.06~0.08MPa. As the results have shown，the existence of radial flameholder caused a significant temperature non-uniformity at the outlet of the combustion chamber. Reducing the total pressure of the combustion chamber will lead to a significant deterioration in combustion efficiency. For every 0.01MPa decrease in total pressure，the corresponding combustion efficiency will decrease by about 5%. The position of the combustion zone is closely related to the flow field. During the mainstream stage combustion，the high-temperature zone is concentrated on both sides of the cavity and the outside of the radial flameholder，while in the central part of the combustor，the cavity flame continuously propagates along the radial flameholder. A higher air excess coefficient will increase the penetration depth of the mainstream fuel jet，cause the mainstream stage combustion zone to be more concentrated on both sides of the combustion chamber，and raise the non-uniformity of outlet temperature. With the air excess coefficient dropping below 2，the excessive enrichment of fuel on both sides of the combustion chamber will lead to the decline of combustion efficiency.