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1、第36卷第5期2010年10月火箭推進JOURNALOFROCKETPROPULSIONV01.36.№.5Oct.2010輸送管壁溫對膏體推進劑燃速的影響張家仙,朱尚龍,王燕娜(北京航天試驗技術(shù)研究所,北京100074)摘要:膏體推進劑作為一種新型特種推進劑,具有廣闊的應用前景。膏體推進劑燃速直接影響發(fā)動機內(nèi)彈道性能,研究輸送管道壁溫對推進劑燃速的影響具有重要意義。采用冪律本構(gòu)方程表征膏體推進劑粘度,Arrhenius方程表征溫度對粘度影響,并利用中心有限差分格式對控制方程進行離散。對恒定壁溫下的膏體推進劑與管道間傳熱特性進行數(shù)
2、值仿真,并進行了數(shù)值驗證。結(jié)合仿真結(jié)果,并借鑒固體推進劑初溫與燃速關(guān)系,分析了熱管道內(nèi)膏體推進劑燃速特性。結(jié)果表明:近壁面加熱層厚度隨入口速度增高而減小,隨管徑增大而增大,管內(nèi)膏體推進劑平均燃速較入口溫度條件下有所提高,同時,高溫壁面條件下,近壁面推進劑溫度高于爆發(fā)點,需要考慮管道內(nèi)的防竄火措施。關(guān)鍵詞:膏體推進劑;燃速;傳熱;輸送管中圖分類號:V439.34文獻標識碼:A文章編號:(20lo)05-0031一05Influenceofwalltemperatureoffeedlineonpastypropellantburnin
3、grateZHANGJia-xian,ZHUShang·long,WANGYan-na(BeijingInstituteofAerospaceTestingTechnology,Beijing100074,China)Abs蛔ct:Asanewkindofpropellant,pastypropellanthasabrightprospectinapplication.Theburningrateofpastypropellanthasadirectinfluenceoninteriorballisticsofengines,80
4、itisveryim-portanttostudytheinfluenceofwalltemperatureoffeedlineonthepastypropellantburningrate.Thepower-lawconsti.tutiveequationandArrheniusequationareadoptedtocharactertheviscosityofpastypropellantandtheinfluenceoftemperatureontheviscosityrespectively.Thecentralfini
5、tedif-ferenceschemeisusedtodispersethecontrolequations.Aftervalidatingthenumericalmethod,thenumericalsimulationonthecharacteristicoftheheattransferbetweenthepastypropellantandfeedlinewerecarriedoutatconstantwalltemperature.Accordingtotherelationshipbetweeninitialtem—p
6、eratureandburningrateofasolidpropellant,theburningratecharacteristicsofthepastypropellantinahotfeedlinewereanalyzedbasedonthenumericalsimulations.Theresultshowsthattheheatedlayerthicknessclosetothewalldecreaseswi廿ltheaugmentofinletvelocityandincreaseswiththeaugmentoff
7、eedlinediameter.Theaverageburningrateofthepastypropellantinfeedlineishigher收稿日期:2010--09—21;修回日期:2010-10-17作者簡介:張家仙(1981—),男,工程師,研究領(lǐng)域為液體火箭發(fā)動機試驗32火箭推進2010年10月thanthatatinlettemperature.Meanwhile,asthewallisathightemperature,thepropellanttempera—tareclosetothewallishigh
8、erthanthatofitsbreakoutpoint,anditisnecessarytotakeintoaccounttheanti-backfiremethods.KcTworcb:pastypropellant;burningrate;h