Abstract: Fortheanalysisoftheenergyconversionefficiencyoflaserpropulsionwithgas-liquidtwophasepropellant，anidealcyclemodelforlaserpropulsionwithgas-liquidtwophasepropellantisestablished，andthefactorsofenergyconversionefficiencyareanalyzed.Theresultsshowthattherampressureratioandthecon.stantvolumecompressionratioarethemainfactorsofenergyconversionefficiency.Theincreasingoframpres.sureratioorconstantvolumecompressionratiocanimprovetheenergyconversionefficiency.Therampressurera.tioincreaseswithincreasinginletMachnumber，andtheconstantvolumecompressionratioincreaseswiththeincreaseoflaserpowerdensityormassratioofwatertogas.Theincreasingofmassratioofwatertogascanin.creasetheconstantvolumecompressionratioandthenimprovetheenergyconversionefficiencyeffectively.Whentherampressureratioπ=10andthemassratioofwatertogasincreasesfromf=0tof=10，theenergyconversionefficiencyincreasesfromηt=52.5%toηt=55.8%.

Key words: Gas-liquidtwophasepropellant；Laserpropulsion；Idealpowercycle；Energyconversionefficiency

摘要： 为了分析气液两相工质激光推进的能量转换效率，建立了气液两相工质激光推进的理想动力循环模型，对能量转换效率的影响因素进行了研究。结果表明，冲压比和定容增压比是影响能量转换效率提高的主要因素，增大冲压比或定容增压比都能有效提高能量转换效率，冲压比随进口马赫数的增大而增大，而定容增压比随激光功率密度或工质中水滴与空气质量比的增大而增大。增大工质中水滴与空气的质量比能够有效增大定容增压比，提高能量转换效率，据算例可得，当冲压比π=10，水滴与空气的质量比f由0增大到10时，能量转换效率ηt由52.5%提高到了55.8%。

关键词: 气液两相工质；激光推进；理想动力循环；能量转换效率中图分类号:TN249，V439文献标识码:A文章编号:1001-4055(2015)12-1909-06DOI:10.13675/j.cnki.tjjs.2015.12.022