沖壓發(fā)動機補燃室工作過程數(shù)值仿真研究.pdf

1、南京理工大學(xué)碩士學(xué)位論文沖壓發(fā)動機補燃室工作過程數(shù)值仿真研究姓名：趙春宇申請學(xué)位級別：碩士專業(yè)：航空宇航推進理論與工程指導(dǎo)教師：鞠玉濤20060623碩士論文沖壓發(fā)動機樸燃室工作過程數(shù)值仿真研究ABSTRACTInthispapertheturbulentcombustionmodeloftheAssistedRangeRocketRamjetEnginesecondaryflreboxisfoundedTheresearchabout

2、theprocessofthemixingandchemistryreactionsofthesecondaryfireboxtwo—dimensionflowfieldhasbeendoneTheFLUENTsoftwareisusedtOsimulatethedesignparameters’influencesuchasexitpressure，mass—rateratiooftheairandfuelandthefuel’s硒e

3、etingangleonthemixingandcombustionefficiencyTheresultsindicatethatwhenthefuelispuregas，theflowfieldinthesecondaryfireboxisverycomplex，includingthreevortexes，whichareveryimportanttotheprocessofmixtureandcombugionThepressu

4、reinthesecondaryfireboxisevenbutthetemperaturechangesfrequentlyIncreasingtheexitpressureandthemassrateratio，thetemperatureinfrontofthesecondaryfireboxincreases，thelengthofthesecondaryfneboxwhenthefuelisburntOUtdecreases，

5、thecombustionefficiencyincreasesIncreasingthefuelsinjectingangleinsomerange，theradialvelocityofthefuelincreases，theaxialvelocitydecreases，thefuel’sremaintimeinthesecondaryfireboxincreases，butithaslittleinfluenceonthecomb

6、ustionefficiencyWhentheairspacevariesincreasingtheflyingheightthetemperatureinfrontofthesecondaryfireboxdecreasesthelengthofthesecondaryfireboxwhenthefuelisburntOutincreases，thecombustionefficiencydecreasesWhenthefuelinc

7、ludesgasandsolid，thevariationtrendofthevelocityvectofpressure，temperatureandthemassfractionofeachspeciearethesameasthepuregas’sIfthediameterofthesolidparticlesincreasesthecombustionefficiencydecreasesIfthelengthoftheseco