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采用基于集总参数方程的燃烧室性能计算模型,辅以临界面积法,应用于隔离段和燃烧室的一维流场计算,实现了双模态超燃冲压发动机各种模态下的隔离段和燃烧室的流量匹配计算,并分析了流量匹配工作机理.结果表明:在未分离超燃模态与分离超燃模态下,增加燃烧室供油流量,隔离段和燃烧室流量匹配是通过流道中的喉道处马赫数降低来实现的;在跨燃模态与亚燃模态下,增加燃烧室供油流量,流量匹配主要是通过提高燃烧室流道中热力喉道处的总压来实现的.
The calculation model of the combustion chamber based on the lumped parameter equation is used, and the critical area method is applied to calculate the one-dimensional flow field in the isolation section and the combustion chamber. The isolation section under various modalities of the dual-mode scramjet is achieved. And the flow of the combustion chamber were calculated and the working mechanism of the flow matching was analyzed.The results show that the matching between the flow rate of the isolation section and the combustion chamber can be achieved by increasing the fuel supply flow rate in the combustion chamber without the separation of the supersonic combustion mode and the separation of the combustion mode In the cross-combustion mode and the sub-combustion mode, the fuel flow of the combustion chamber is increased. The flow matching is mainly achieved by increasing the total pressure at the thermal throat in the flow channel of the combustion chamber Achieve.