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建立了基于整个燃烧室内经历不同燃烧方式下所有工质来评估脉冲爆发动机平均循环热效率的方法,通过二维数值方法对两种采用不同数目障碍物的爆震管模型的起爆特性及循环热效率进行了研究,并分析了燃烧波传播的距离与DDT距离之比(定义为ξ)对模型热效率的影响.结果表明:1间接起爆方式及不同DDT强化装置都会影响系统的循环热效率;2就计算模型,当ξ接近1时,其系统平均循环热效率仅为理想爆震循环热效率的60%左右;3随着ξ的增加,间接起爆方式的影响迅速减弱;4当ξ为1.5时,系统平均循环热效率可达爆震燃烧热效率的93%.
A method to evaluate the average cycle thermal efficiency of a pulsed explosion engine based on all the working conditions of different combustion modes in the whole combustion chamber was established. The detonation characteristics and the cycle thermal efficiency of two detonation tube models with different numbers of obstacles were studied by two-dimensional numerical method And the influence of the ratio of DDT distance to DDT distance (defined as ξ) on the thermal efficiency of the model is analyzed.The results show that: 1 indirect initiation mode and different DDT intensifier will affect the system thermal cycle efficiency; 2 the calculation model , When ξ is close to 1, the average cycle thermal efficiency of the system is only about 60% of the ideal knock cycle thermal efficiency; 3 With the increase of ξ, the influence of indirect initiation mode rapidly decreases; 4 when ξ is 1.5, the average cycle thermal efficiency Up to 93% of knock combustion heat efficiency.