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为研究富氢/富氧燃气同轴双剪切气-气喷嘴设计参数对燃烧性能和燃烧室热载的影响,采用正交试验设计方法对这些参数进行组合,数值模拟单喷嘴燃烧室流场,并以燃烧长度、燃烧室壁面和喷注面板处平均燃气温度为指标评价燃烧性能和热载.结果表明:燃氧速度比对燃烧性能和燃烧室热载影响最显著,中心氢流量比例对燃烧室热载影响非常显著,氧压降比对喷注面板处燃气平均温度的影响也很显著,而喷嘴出口壁厚对喷嘴性能影响不明显.燃氧速度比和氧压降比的交互作用对喷嘴性能有一定影响,而其他设计参数之间的交互作用对喷嘴性能影响非常小.最短燃烧室长度为117.9mm,最低壁面燃气温度及面板燃气温度分别为1637.7K和806.6K. 相似文献
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同轴双剪切气-气喷嘴数值模拟 总被引:2,自引:1,他引:1
通过求解k-ε湍流模型的Navier-Stokes方程组,对以气氢/气氧为推进剂的同轴双剪切喷嘴燃烧室流场进行数值模拟研究.结果表明:气-气推进剂在燃烧室内形成两个燃烧面,能在大流量下实现较高的燃烧效率;同轴双剪切喷嘴的氧喷注速度和氢氧速度比是同轴双剪切喷嘴设计的关键参数,氧喷注速度越小使推进剂的燃烧位置越远离喷注面,而氢氧速度比越大使燃烧位置越靠前;与气-液同轴剪切喷嘴相比,同轴双剪切气-气喷嘴的设计可以取较大的氧喷注速度和适合的氢氧速度比. 相似文献
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Five types of coaxial injectors were investigated experimentally using hot hydrogen-rich gas and oxygen-rich gas, which were respectively provided by a GH2/GO2 hydrogen-rich perburner and a GH2/GO2 oxygen-rich preburner. The injectors were the shear coaxial injector, the oxidizer post expansion coaxial injector, the fuel impinging coaxial injector, the central body coaxial injector, and the shear tri-coaxial injector. The characteristic velocity efficiency and the combustor's wall temperatures were obtained for different design parameters through the experiments. It can be con- cluded that angles of the oxidizer post expansion and the fuel impinging have little influence on the combustion performance and the wall temperatures. The contact area between fuel and oxidizer and the mass flow rate have significant impacts on the combustion performance. The shear tri-coaxial injector has the best combustion performance but also the highest wall temperatures among the five types of injectors. 相似文献
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在大流量气-气喷注器单喷嘴工况研究的基础上,为研究其在具有单元交互作用的多喷嘴工况下的燃烧特性,设计了多喷嘴推力室.喷注单元为剪切混合式单元,并具有高氢/氧速度比和氧喷嘴扩口设计,采用了能够模拟真实发动机工况的7单元同心圆排布的推力室头部结构,在对喷注单元的排布间距优化设计基础上,开展了热试车试验研究和仿真分析.结果表明所设计的喷注器在多喷嘴工况下燃烧稳定,能够在额定参数设计的燃烧室内,在SSME(space shuttle main engine)主喷注单元流量的3.7倍大流量工况下燃烧效率达到99%以上,并显示出良好的喷注器自身和带来的燃烧室身部热防护特性. 相似文献