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引用次数: 0
摘要
摘要 为优化集成焰室,采用 PIV 技术研究了 V 型槽和集成焰室在非反应和反应条件下的流场。采用 PLIF、高速相机和 TDLAS 捕获 OH 分布、火焰结构和温度分布。对流场、燃烧特性和火焰稳定机制进行了对比分析。结果表明,与无反应流场相比,放热增加了不利的压力梯度,从而扩大了再循环区的面积和再循环率。两种焰座的火焰都呈现出对称结构,分布在剪切层附近。在非反应流场中,阻塞率占主导地位,而在反应流场中,膨胀角占主导地位,这将进一步增加反应条件下的不利压力梯度。与集成式火焰室相比,V 型槽火焰室的燃料/空气混合效果更好,再循环量更大。集成式火焰室的燃烧性能不如 V 形槽火焰室,尽管其阻流性更好。
Experimental study on flow field and combustion characteristics of V-gutter and integrated flameholders
Abstract To optimize the integrated flameholder, PIV was used to study flow fields of V-gutter and integrated flameholder under both non-reacting and reacting conditions. PLIF, high-speed cameras, and TDLAS were adopted to capture OH distribution, flame structure, and temperature distribution. Comparative analysis of flow fields, combustion characteristics and flame stabilization mechanisms were analyzed. Results show that heat release increases adverse pressure gradient, which can enlarge the recirculation zone size and recirculation rate compared to non-reacting flow field. The flames of both flameholders exhibit symmetrical structures distributed near the shear layers. The blockage ratio dominates the non-reacting flow field, while the expansion angle dominates the reacting flow field, which can further increase the adverse pressure gradient under reacting condition. The V-gutter flameholder demonstrates better fuel/air mixing and larger recirculation than the integrated flameholder. The combustion performance of the integrated flameholder is inferior to the V-gutter flameholder, albeit with better flow resistance properties.
期刊介绍:
The Main aim and scope of this Journal is to help improve each separate components R&D and superimpose separated results to get integrated systems by striving to reach the overall advanced design and benefits by integrating: (a) Physics, Aero, and Stealth Thermodynamics in simulations by flying unmanned or manned prototypes supported by integrated Computer Simulations based on: (b) Component R&D of: (i) Turbo and Jet-Engines, (ii) Airframe, (iii) Helmet-Aiming-Systems and Ammunition based on: (c) Anticipated New Programs Missions based on (d) IMPROVED RELIABILITY, DURABILITY, ECONOMICS, TACTICS, STRATEGIES and EDUCATION in both the civil and military domains of Turbo and Jet Engines.
The International Journal of Turbo & Jet Engines is devoted to cutting edge research in theory and design of propagation of jet aircraft. It serves as an international publication organ for new ideas, insights and results from industry and academic research on thermodynamics, combustion, behavior of related materials at high temperatures, turbine and engine design, thrust vectoring and flight control as well as energy and environmental issues.