Exploration Of Intelligent Trapped Vortex Combustor Program

In this paper,combining with the requirements of developing intelligent combustor and the characteristics of trapped vortex combustor,an exploratory research of intelligent combustor was put forward based on the basic requirements of high-temperature-rise combustor and the single cavity trapped vortex combustor was selected as the platform.The flow characteristics and combustion performance of the intelligent trapped vortex combustor were studied by theoretical analysis,numerical simulation and experimental verification.The main research results included:The research results and key technologies of intelligent combustor and trapped vortex combustor at home and abroad were summarized,analyzed and studied.The design of the baffle and the variable flow regulation system was completed.The variable geometry basic program as well as the structural parameters,flow distribution,fuel distribution of the intelligent trapped vortex combustor were designed and optimized by numerical simulation.The numerical simulation of the performance of intelligent trapped vortex combustor was carried out.The results showed that: The inlet Mach number and temperature had little effect on the flow distribution,which affected by the baffled area ratio was bigger.The baffle played a role in regulating the flow distribution,and would not cause too much flow field structure changes.The total pressure loss coefficient increased markedly with the increase of inlet Mach number,and was not affected by the inlet temperature and baffled area ratio.The flow resistance coefficient was basically not affected by the inlet Mach number and temperature,and slightly increased with the baffled area ratio increased.The changing law of combustion performance with the parameters of inlet temperature,inlet Mach number,total fuel/air ratio and baffle position was obtained during the research.The preliminary experimental research of the performance of intelligent trapped vortex combustor was carried out.The results showed that: The total pressure loss coefficient increased significantly with the increase of inlet Mach number,and was not affected by the baffled area ratio.The flow resistance coefficient decreased with the increase of inlet Mach number,and increased slightly with the baffled area ratio increased.At normal temperature,the total fuel/air ratio of ignition and blowout increased first and then decreased with the baffled area ratio increased.When the inlet temperature was 387 K and 487 K,the change of total fuel/air ratio of ignition and blowout was no longer obvious,but at lower fuel supply pressure,the total fuel/air ratio of blowout would be a certain change.The total fuel/air ratio of ignition and blowout decreased with the increase of inlet temperature,and the descending speed gradually slowed down.At the same baffled area ratio,the combustion efficiency increased with the increase of total fuel/air ratio,and the increase range decreased with the baffled area ratio increased.At the same total fuel/air ratio,the combustion efficiency increased with the baffled area ratio increased,and the increase range decreased with the increase of total fuel/air ratio.