煤油两步反应模型在低总温超燃数值模拟中的应用

Application of a Two-Step Chemical Scheme for Kerosene in Supersonic Combustion with Low Total Temperature

为评估煤油两步反应模型在低总温超声速燃烧数值模拟中的准确性和适用性,采用此模型对不同构型超燃冲压发动机在低总温条件下的燃烧流场进行了三维数值模拟。燃烧室构型包括单凹腔矩形燃烧室和双凹腔圆形燃烧室,来流总温包括950 K和600 K。结果表明,采用煤油两步反应模型在低总温条件下模拟超燃冲压发动机燃烧流场,能够得到与试验结果较为吻合的壁面压力曲线以及燃烧流场特征,可以较为准确地反映燃料燃烧过程中化学能释放量。通过分析数值模拟结果,能够获得包括流场结构、流场物理量分布以及燃烧模态等较为全面的燃烧流场信息。

In order to evaluate the accuracy and applicability of a two-step chemical scheme for kerosene in supersonic combustion under low total temperature,computations of the three-dimensional combustion flow field of scramjet have been performed with this model.The results were obtained with the combustor configurations including a rectangular combustor with single-cavity and a circular combustor with dual-cavity,and with the total temperature including 950 K and 600 K.Results show that the simulated wall pressure and combustion flow field are in agreement with the experiments,and the simulated flow field can accurately reflect the chemical energy release during the combustion process.As expected,more overall information of combustion flow field including the flow structure,the physical variable distribution and the combustion mode can be obtained by analyzing the numerical results.