Study On The Combustion Performance Of Single Cavity Trapped Vortex Combustor

Single cavity trapped vortex combustor is a new type trapped vortex combustor of highefficiency and low emission. It has simple and compact structure, lighter weight, length shorter.With asymmetry structure, its flow characteristics and combustion performances are unique. Thisarticle designs the overall structure of a single cavity trapped vortex combustor. Besides, thenumerical simulation and experimental research are carried out. The main research results arelisted as follows:(1) Structure size of the single cavity trapped vortex combustor are obtained by designing theoverall structure、flow distribution and oil&gas distribution.(2) Numerical simulation of the single cavity trapped vortex combustor performances arecarried out. The calculation results show that the mixing hole and inlet temperature has moreinfluences on the flow distribution than the inlet of Mach number. However, the influence of inlettemperature disappears when the temperature is higher than450k; differences exists between theflow field and temperature field distribution with the turbulent dissipation mainly exists in thecooling seam and mixing holes. The changing law between combustion performances and inlettemperature、import Mach number and residual coefficient are obtained.(3) Experimental researches of the single cavity trapped vortex combustor are also carried out.According to the experiment results, with the import Mach number increases, total pressure losscoefficient increases from1.56%to6.0%while the flow resistance coefficient remain unchanged;The ignition performance is improved with higher inlet temperature while the import Machnumber has little influences. The low blow-out performance is improved with higher inlettemperature and higher import Mach number. In the experiment, the largest ignition residualcoefficient is8.9and14.08is the biggest weak flameout residual coefficient; It is found that thecombustion efficiency increases with the inlet temperature while the OTDF decreases; Increasesof the import Mach number lower the combustion efficiency; When the oil is only supplied to thevortex region, combustion efficiency rises with the total residual coefficient; while the OTDFvalue decreases at first and then increases with the import Mach numbern rises. At the same time,OTDF value decreases with total residual coefficient increases. When the oil is supplied to boththe vortex and mainstream areas, combustion efficiency increases at first and then decreases withthe total residual coefficient increasing. The combustion efficiency is highest when the totalresidual coefficient is2.58. This paper lays foundation for further improvements and optimizations of the single cavitytrapped vortex combustor and provides safeguard for further research and explorations.