部分覆盖构型对凹腔冷态和燃烧流场的影响

推进技术 ›› 2014, Vol. 35 ›› Issue (5): 661-667.

部分覆盖构型对凹腔冷态和燃烧流场的影响

包恒,周进,潘余

国防科技大学高超声速冲压发动机技术重点实验室，湖南长沙 410073;国防科技大学高超声速冲压发动机技术重点实验室，湖南长沙 410073;国防科技大学高超声速冲压发动机技术重点实验室，湖南长沙 410073

发布日期:2021-08-15
作者简介:包恒(1989—)，男，博士生，研究领域为高超声速推进技术。E-mail:baoheng1989@163.com
基金资助:
国家自然基金(11372348)。

Effects of Partly Covered Shape on an Isothermal and Exothermic Cavity Flowfield

Science and Technology on Scramjet Laboratory，National University of Defence Technology， Changsha 410073，China;Science and Technology on Scramjet Laboratory，National University of Defence Technology， Changsha 410073，China;Science and Technology on Scramjet Laboratory，National University of Defence Technology， Changsha 410073，China

Published:2021-08-15

摘要/Abstract

摘要： 为了研究凹腔部分覆盖构型对燃烧室流场的影响，采用SST k - ε 湍流模型和有限化学速率/涡破碎模型，对部分覆盖型凹腔的冷态和燃烧的二维流场进行了数值仿真。比较了贫燃和富燃条件下，覆盖板对凹腔燃料分布、流场温度和燃烧效率的影响。研究发现贫燃下，覆盖板有利于凹腔内燃料的积累，提高了凹腔的火焰稳定性，同时由于点火适宜的当量比区域位于凹腔内低速区，增强了凹腔点火能力；富燃下，覆盖板使凹腔内富燃环境进一步恶化，降低了凹腔的火焰稳定性和燃烧效率，主要燃烧区部分向下游转移。

关键词: 凹腔；部分覆盖；前壁面喷注；超声速燃烧

Abstract: Aimed at investigating the effects of partly-covered shape on the flowfield of combustor，SST k - ε turbulent model and finite-rate/eddy-dissipation model were used to simulate both the isothermal and exothermic 2-D flowfiled of a partly-covered cavity. The effects of cover-plane on fuel distribution，static temperature distribution and combustion efficiency were checked on both lean and rich fuel condition. In the lean fuel flowfield，the cover-plane is helpful in accumlating the fuel in cavity，and the flameholding stability can be improved. In the flowfield with a partly-covered cavity，the region with feasible ignition equivalence ratio is located inside the cavity with low-speed. So the ignition capability of the partly-coved cavity is also improved. In the rich fuel flowfield，the cover-plane makes the rich condition worsen inside cavity. The flameholdering stability and combsution efficiency are both reduced. A part of main combustion region moves downstream.

Key words: Cavity；Partly-covered；Front wall injection；Supersonic combustion

包恒,周进,潘余. 部分覆盖构型对凹腔冷态和燃烧流场的影响[J]. 推进技术, 2014, 35(5): 661-667.

BAO Heng,ZHOU Jin,PAN Yu. Effects of Partly Covered Shape on an Isothermal and Exothermic Cavity Flowfield[J]. Journal of Propulsion Technology, 2014, 35(5): 661-667.

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