Mixing and Combustion Enhancement in Scramjet Combustors Induced by Interaction between Vortex and Shock Wave

涡流与冲击波相互作用引起超燃冲压发动机燃烧室的混合与强化燃烧

• 批准号: 08455459
• 负责人: MASUYA Goro
• 金额: $ 4.99万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455459/
• 关键词: Scramjet; Supersonic Mixing; Supersonic Combustion

In order to establish a method to evaluate relative importance of gain and loss in the available energy to be converted into the propulsive work in the scramjet combustor, we introduced a combustor performance parameter which was written in terms of the kinetic energy efficiency and the combustion efficiency. These two efficiencies in the parameter were combined in the form appearing in the equation for thrust. The combustor performance parameter was evaluated with the available experimental data for two supersonic combustors with eight fuel injection patterns, and it clarified the effects of injection pattern, combustor length, chemical reaction in the nozzle were investigated. The result showed that the optimum combustor length based on the parameter was less than a half of one estimated only from the combustion efficiency or the mixing efficiency. It was found that use of the properties of pure air instead of those of vitiated air used in the experiment may results in significantly … More different value of the performance parameter.As a typical flowfield where interaction between vortices and shock waves occurs, compressible swirling jet of over- or under-expansion condition was chosen, and mixing of such jet was experimentally investigated. At first, non-swirling jet of Mach 0.3, 1.0 or 2.0 was injected into quiescent atmosphere or heated subsonic flow. Mixing characteristics of the non-ideally expanded non-swirling jets could be well correlated with those of the ideally expanded jets when the reference values of diameter and velocity calculated with assumption of expansion or compression to ambient pressure keeping the stream thrust constant were used to non-dimensionalize the data. The swirling jet was produced by attaching a swirler in the subsonic portion of the nozzle. Mixing of the jet was slightly enhanced by increasing swirl number. In comparison with the ideal expansion jet, the potential core region of the non-ideally expanded swirling jet was shortened, but its mixing rate in the developed region was retarded. Effect of swirl on the mixing of two parallel supersonic jets were observed by flow visualization. The swirl enhanced mixing near the merging region of the twin jets. Swirl of the same direction for both jets had resulted in better mixing then that of the counter direction. Less

为了建立一种评估可用能量中增益和损失的相对重要性，以将其转换为Scramjet复合材料中的推进工作，我们引入了一个复合性能参数，该参数是根据动能效率和综合效率编写的。参数中的这两个效率以出现在推力方程中的形式组合在一起。用两个具有八种燃油注入模式的超音速燃烧器的可用实验数据评估了复合性能参数，并阐明了注射模式，复合长度，化学反应在喷嘴中的影响。结果表明，基于参数的最佳综合长度小于仅根据组合效率或混合效率估算的一半。发现使用纯空气的特性代替实验中使用的空气的性能可能会产生显着……性能参数的更多不同价值。当发生涡流与冲击波之间的相互作用之间的典型流场时，选择了过度或不足的暴露条件的兼容旋转射流，并且选择了这种射流的混合。首先，将0.3、1.0或2.0的非旋转射流注入静态大气或加热的亚音速流中。当直径和速度的参考值通过假设扩展或压缩到环境压力下，将流动推力常数计算出来时，非理想扩展的非旋流喷气机的混合特性与理想扩展的喷气机的混合特性可以很好地相关。旋转喷气机是通过在喷嘴的亚音速部分中固定漩涡来产生的。通过增加旋转数量，射流的混合略有增强。与理想的膨胀射流相比，缩短了非理想膨胀旋流喷射的潜在核心区域，但其在发达区域中的混合速率受阻。通过流动可视化观察到漩涡对两种平行超音速喷气机混合的影响。双流喷气机的合并区域附近的漩涡增强了混合。两种喷气机的相同方向的旋流都使混合更好地混合了。较少的

项目成果

Goro Masuya,et al.: "Performance Evaluation of Scramjet Combustors Using Kinetic Energy and Combastion Efficienies" Journal of Prepulsion and Power. 15・2(印刷中). (1999)

Goro Masuya 等人：“利用动能和燃烧效率进行超燃冲压发动机燃烧器的性能评估”，《预推力与动力》杂志 15・2（出版中）。

G.Masuya, T.Uemoto, Y.Wakana, K.Kudou, A.Murakami, and T.Komuro: "Performance Evaluation of Scramjet Combustors Using Kinetic Energy and Combustion Efficiencies" Journal of Propulsion and Power. 15-3, in press. (1999)

G.Masuya、T.Uemoto、Y.Wakana、K.Kudou、A.Murakami 和 T.Komuro：“利用动能和燃烧效率对超燃冲压发动机燃烧器进行性能评估”《推进与动力杂志》。

G.Masuya, et al.: "Performance Evaluation of Scramjet Combustors Using Kinetic Energy and Combustion Efficiencies" Journal of Propulsion and Power. 15・3(in press). (1999)

G.Masuya 等人：“利用动能和燃烧效率对超燃冲压发动机燃烧器进行性能评估”《推进与动力杂志》15・3（出版中）。