双模态超燃燃烧室性能准一维计算方法

A Quasi-One-Dimensional Method for Prediction of Dual Mode Scramjet Combustor Performance

关键词:  双模态  燃烧室性能  预燃激波串  准一维 

Key words:  Dual mode  Combustor performance  Pre-combustion shock train  Quasi-one-dimension

摘要:

为了快速准确地得到双模态超燃燃烧室性能,对已有准一维非稳态方法进行了研究,发现当燃烧室工作在亚燃模态时此方法不能正确预测预燃激波串的压力变化趋势。将预燃激波串模型耦合到准一维非稳态方法中,得到一种改进的准一维非稳态计算方法。通过四组不同算例验证表明,此方法能准确地预测双模态超燃燃烧室的压力变化趋势,同时也能准确地捕捉到压力峰值,具有较高的精度和较好的适用性。 

Abstract:

In order to predict the performance of a dual mode scramjet combustor rapidly with high precision, a quasi-one-dimensional unsteady method was studied. Results show that it fails to predict the pressure distribution of pre-combustion shock train when the dual mode scramjet combustor is working in ramjet mode. A modified quasi-one-dimensional unsteady method for prediction of dual mode scramjet combustor performance was developed by coupling a pre-combustion shock train model. The calculation was compared with four published experimental results from the literature. Good agreement is obtained for the pressure distribution and its peak value in the dual mode scramjet combustor. This method has reasonably high precision and wide applicability. 