航天推进技术研究院主办
[1]汪广旭,刘占一,谭永华,等.燃烧室纵向压力振荡对燃料掺混过程的影响[J].火箭推进,2020,46(06):60-68.
WANG Guangxu,LIU Zhanyi,TAN Yonghua,et al.Research on effects of longitudinal pressure oscillation on fuel mixing process in combustion chamber[J].Journal of Rocket Propulsion,2020,46(06):60-68.
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WANG Guangxu,LIU Zhanyi,TAN Yonghua,et al.Research on effects of longitudinal pressure oscillation on fuel mixing process in combustion chamber[J].Journal of Rocket Propulsion,2020,46(06):60-68.
燃烧室纵向压力振荡对燃料掺混过程的影响
《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]
卷:
46
期数:
2020年06期
页码:
60-68
栏目:
研究与设计
出版日期:
2020-12-31
- Title:
- Research on effects of longitudinal pressure oscillation on fuel mixing process in combustion chamber
- 文章编号:
- 1672-9374(2020)06-0060-09
- 分类号:
- V231.1
- 文献标志码:
- A
- 摘要:
- 对于气/气同轴剪切喷嘴,推进剂通过射流剪切过程产生的相干涡实现掺混,这一过程不仅决定了下游燃烧释热分布情况,也容易受到燃烧室压力振荡的影响,研究上述问题对于认识高频燃烧不稳定问题具有重要意义。主要通过非定常燃烧流场仿真,给出了不同稳定性工况下单喷嘴燃烧室纵向压力振荡过程以及相应时刻涡量场,对比分析了不同幅值压力振荡对燃料射流掺混过程的影响规律,并结合轴向平均温度及燃烧释热分布,讨论了主要燃烧释热区集中程度和相对波腹位置与稳定性之的关系。研究表明:燃烧室压力振荡会显著影响气态燃料射流掺混过程,造成相干涡结构横向抖动加剧,使相应的释热和温度分布更靠近喷注面附近的声振波腹区,而喷嘴出口射流动能的增加会使燃烧释热区沿轴向更加散布,有利于稳定性的提高。
- Abstract:
- For gas/gas shear coaxial injector, the propellant is mixed by coherent vortex produced coaxial jet flow and its shear process.This process not only determined final heat release distribution downstream, but also prone to be affected by pressure oscillation in combustion chamber.Research on this problem has a significant meaning for further understanding of high frequency combustion instability.Through unsteady combustion field simulation, longitudinal pressure oscillation process and corresponding vorticity field of a combustor with single injector under different stability conditions was given.Effects of pressure oscillation with different amplitudes on fuel mixing process by shear jet flow was analyzed through compared analysis.Relation between the concentration and position to antinode of main combustion zone and the stability was also discussed.It is indicated that pressure oscillation in combuston chamber will significantly affect the jet flow and mixing process of gaseous fuel.Transverse vibration of coherent vortex structure will be enhanced, which lead to corresponding heat release zone and temperature distribution more close to the acoustic antinode near the injector face.Furthermore, improve the outlet kinetic energy of fuel jet will make combustion heat release zone more scattered along axial direction, which is beneficial to stability.
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备注/Memo
收稿日期:2019-10-11; 修回日期:2019-12-12 基金项目:国家自然科学基金(11602186) 作者简介:汪广旭(1987—),男,博士,高级工程师,研究领域为液体火箭发动机燃烧稳定性
更新日期/Last Update:
1900-01-01