Journal of Propulsion Technology ›› 2014, Vol. 35 ›› Issue (5): 661-667.

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

  

  1. 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

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   

  1. 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
  • 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)。

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

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