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为研究零二次流引射器结构参数如何影响其启动性能,采用数值方法模拟求解了引射器流场,并分析了引射器从启动到不启动的典型工作状态。结果表明:扩压器入口面积与引射喷管喉部面积之比Ad/At和第二喉道收缩比Ast/Ad是影响引射器性能的首要因素,其次是第二喉道长径比Lst/Dst和第二喉道入口的位置Ld/Dd。Ad/At越大,扩压器入口斜激波越强,总压损失越大,临界启动压比越大,越难以启动;Ast/Ad越小(大于其临界收缩比)则临界启动压比越小,越易于启动。
In order to study how the zero secondary flow ejector structure parameters affect its starting performance, numerical simulation is used to simulate the ejector flow field, and the typical working condition of the ejector from starting to not starting is analyzed. The results show that the ratio of inlet area to nozzle throat area, Ad / At, and the second throat contraction ratio, Ast / Ad, are the most important factors that affect ejector performance. The second throat aspect ratio Lst / Dst and the location of the second throat entrance Ld / Dd. The larger the Ad / At, the stronger the diastolic shock at the inlet of the diffuser, the greater the total pressure loss and the greater the critical pressure ratio is and the more difficult it is to start. The smaller the Ast / Ad ratio (greater than the critical contraction ratio) The smaller, the easier it is to start.