RBCC变结构燃烧室动态特性研究  

Study on Dynamic Characteristics of RBCC Variable Structure Combustion Chamber

作　　者：潘宏亮[1] 叶进颖 邹祥瑞 秦飞[1] PAN Hong-Liang1 ,YE Jin-Ying1, ZOU Xiang-Rui2 ,QIN Fei1(Science and Technology on Combustion, Internal Flow and Thermal-structure Laboratory, Northwestern Polytechnical University, Xi＇an 710072, China; 2. China Academy of Launch Vehicle Technology, Beijing 100076, Chin)

机构地区：[1]西北工业大学燃烧热结构与内流场重点实验室,西安710072 [2]中国运载火箭技术研究院,北京100076

出　　处：《工程热物理学报》2018年第9期2087-2096,共10页Journal of Engineering Thermophysics

摘　　要：变结构燃烧室是提高宽范围工作RBCC(Rocket-Based Combined-Cycle)发动机性能的有效途径之一,本文旨在研究RBCC变结构燃烧室动网格CFD模拟可行性,揭示内流道气动热力过程随燃烧室结构变化的动态特性,获得结构调节控制规律。本文针对(2～7)Ma来流条件设计了宽范围工作的变结构燃烧室,并进行了4 Ma来流条件下的燃烧室结构变化动态特性CFD模拟及实验研究,验证了CFD方法的准确性。结果表明:采用较小的时间步长(1E-6 s)能够更好捕捉流场细节,合适的时间步长(1E-5 s)能基本反映燃烧流场特征变化并节约计算时间;燃烧室扩张比及几何喉道阶跃变化产生的流道压力响应时间为0.015 s;在0.5 s内完成结构等速调节的结构控制规律是可行的,能实现RBCC内流道气动参数平稳过渡。Variable structure combustion chamber is one of the effective ways to improve the performance of RBCC（Rocket-Based Combined-Cycle） engine operating in a wide range. The purpose of this paper is to study the feasibility of dynamic mesh CFD simulation of RBCC variable structure combustion chamber, and to reveal the dynamic characteristics of the aerodynamic thermodynamic process of the inner channel with the structural change of the combustion chamber, access to structural adjustment control law. In this paper, a wide range of variable structure combustion chamber is designed for（2-7） Ma flow conditions. CFD simulation and experimental study on the dynamic characteristics of combustion chamber under 4 Ma flow conditions are carried out to verify the accuracy of CFD method. The results show that the smaller time step（1 E-6 s） can better capture the details of the flow field, and the appropriate time step（1 E-5 s） can basically reflect the change of combustion flow field characteristics and save the calculation time. The pressure response time of the combustion chamber expansion ratio and geometric throat step change is 0.015 s. It is feasible to complete the structural control law by the constant velocity regulation within0.5 s, which can realize the smooth transition of the aerodynamic parameters of the RBCC flow path.

关 键 词：火箭基组合循环 动网格 变结构 动态特性 

分 类 号：V438[航空宇航科学与技术—航空宇航推进理论与工程]