Research On The Influence Of Combustor Dome Design On The Combustion Performance

In this paper, the design of the combustor dome and the influences of the combustor dome onthe combustor performance was studied through computational fluid mechanics, and the furtherreserch was done on the fuel properties’ settings under high temperature and high pressure and thenumerical simulation of the unsteady-state combustion process, which were encountered in ignitionand extinguishing process.Software on the combustion overall structure design parameter establishment was developed,which is advantageous for combustion design, before the design methods of the combustor dome wasdiscussed in detail. An estimation method of the swirler flow coefficient,which was one of the keyparameters in the combustion dome design,was explored, and validated by the numerical simulationresult. The influences of the various swirler structure parameters on the flow fields and swirlerperformance of one-dome combustor model with single-stage swirler and multi-stage swirler wasstudied with numerical simulation methods, and then the law of combustor dome structure designwas discussed, and an optimized combustor dome structure was propsed on preceding analysis.On account of the importance of reasonable fuel thermal parameters setting in numericalsimulation process,especially under high temperature and high pressure circumstance, a method offuel thermal parameters calculation was established on the basis of the concept of jet fuel surrogates,P-R state equation, generalized corresponding states principle and Kay’ mixing rule. The kerosenethermal data under the practical combustion conditions were achieved, with these calculatedparameters not the existing data offered by CFD software, the designed combustor’ fluid andcombustion properties were well got. The compare result with the Fluent default calculation showthat the calculated parameters setting is more credible.It’s difficult to simulate the unsteady combustion process such as ignition and blowoff process,an innovation combustion simulation model named second-order moment algebra model wasemployed in the ignition/blowoff process, and the unsteady combustion process was simulatedreasonably and the combustor performance of the optimized combustor structure was achieved.Thenseveral semi-empirical models for ignition and blowoff limit was discussed, and a computer code,based on these models,was developed for predicting ignition and lean blowoff limit.