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力学学报  2015 

双模态发动机的模态鉴别方法

DOI: 10.6052/0459-1879-14-251, PP. 389-397

Keywords: 双模态冲压发动机,模态鉴别,释热分布

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Abstract:

双模态冲压发动机的不同燃烧模态具有不同的稳焰机制和流态特征,并且在模态转换时伴随着显著的推力变化.因此,准确判断燃烧模态,对于捕捉发动机的燃烧区位置/范围、释热分布特征,以及为进一步优化燃烧室的设计(流道结构和供油布局)具有重要意义.目前尚无鉴别模态的有效试验方法,本文提出了一种模态鉴别的试验方法,并在超燃直连台上开展验证试验.试验中使用的测量技术包括壁面静压、高速阴影/纹影、多通道可调谐二极管吸收光谱和高能态碳氢自由基CH*自发光成像.利用多种测量方法的组合,可以同时获得燃烧室中气流静温、速度、马赫数分布,释热分布以及燃烧区位置/范围.这些试验数据能够用于判别模态,并获得不同模态的流动和火焰特征.

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