摘要
主动冷却式超燃冲压发动机作为高超声速飞行器的核心部件,对其工作特性研究和性能优化已成为高超声速领域的重要研究方向。通过掌握气化碳氢燃料的射流结构规律,可以优化燃料在燃烧室的混合特性,促进燃料的高效燃烧,进而提升发动机净推力。本文采用实验的研究方法,以静止环境中的气化煤油射流结构作为研究对象,通过射流图像的自然光采集和处理,分析了常规喷注的扩张角特性和斜喷注的偏折特性,以及射流中存在的不稳定现象。研究结果表明,随着工况的提高,气化煤油射流扩张角呈现先增大后减小的变化趋势,受温度、压力和喷嘴构型影响较大。认为扩张角表现出的脉动现象主要是由于上游管内煤油的密度波不稳定造成的。由于壁面约束的作用,气化煤油的射流方向与喷孔轴向存在一定偏差,可达端面倾角的1/2。
引文
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