航天推进技术研究院主办
[1]孔维鹏,谢恒.25t级氢氧膨胀循环发动机推力室氧腔流动仿真[J].火箭推进,2022,48(01):30-37.
KONG Weipeng,XIE Heng.Flow simulation of oxygen dome in thrust chamber of 25-ton LOX/LH2 expansion cycle rocket engine[J].Journal of Rocket Propulsion,2022,48(01):30-37.
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KONG Weipeng,XIE Heng.Flow simulation of oxygen dome in thrust chamber of 25-ton LOX/LH2 expansion cycle rocket engine[J].Journal of Rocket Propulsion,2022,48(01):30-37.
25t级氢氧膨胀循环发动机推力室氧腔流动仿真
《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]
卷:
48
期数:
2022年01期
页码:
30-37
栏目:
研究与设计
出版日期:
2022-02-28
- Title:
- Flow simulation of oxygen dome in thrust chamber of 25-ton LOX/LH2 expansion cycle rocket engine
- 文章编号:
- 1672-9374(2022)01-0030-08
- 关键词:
- 氢氧膨胀循环火箭发动机; 推力室; 氧腔; 流动均匀性; 数值仿真
- Keywords:
- LOX/LH2 expansion cycle rocket engine; thrust chamber; oxygen dome; flow uniformity; numerical simulation
- 分类号:
- V434.1
- 文献标志码:
- A
- 摘要:
- 为提高25 t级氢氧膨胀循环发动机推力室氧喷嘴出口流量均匀性,采用CFD方法对氧腔内流场进行了三维稳态数值仿真研究,分析了造成出口流量分布不均的原因,并据此设计了4种改进结构的氧腔,对每种结构进行了细节优化。通过数值仿真得到了不同方案氧腔内的流场分布以及喷嘴出口流量分布,对比分析了均流板和液氧入口结构对出口流量均匀性的影响。研究结果表明:通过采用扩张型入口结构降低氧腔入口流速,可以显著提高出口流量均匀性,喷嘴出口流量相对分布范围由11.97%降低至4.54%; 通过增加均流板孔数并调整孔径大小可提高出口流量均匀性,喷嘴出口流量相对分布范围由11.97%降低至6.56%; 凸顶式或凹腔式均流板的均流效果与平板式均流板相比均较差。
- Abstract:
- In order to improve the flow uniformity of oxygen nozzle outlet in the thrust chamber of a 25-ton LOX/LH2 expansion cycle rocket engine,a three-dimensional steady-state numerical simulation of the flow field in the oxygen dome was conducted using CFD method,and the reasons for the uneven flow distribution at the outlet were analyzed. Four kinds of oxygen domes with improved structures were designed and each structure was optimized in detail. The flow field distribution in the oxygen dome and the flow distribution at the nozzle outlet were obtained by numerical simulation,and the effect of the equalizing plate and the liquid oxygen inlet structure on the flow uniformity at the nozzle outlet was analyzed. The results show that the uniformity of flow rate at the outlet can be significantly improved by adopting an expanded inlet structure to reduce the flow rate at the inlet of oxygen dome,and the relative distribution range of nozzle outlet flow is reduced from 11.97% to 4.54%. The outlet flow uniformity can be improved by increasing the orifice number and adjusting the orifice size,and the relative distribution range of nozzle outlet flow is reduced from 11.97% to 6.56%. Compared with the flat plate,the flow equalizing effect of convex plate or concave plate is worse.
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备注/Memo
收稿日期:2021-10-12; 修回日期:2021-12-20
基金项目:国家装备预研航天科技联合基金(6141B061207)
作者简介:孔维鹏(1992—),男,博士,工程师,研究领域为液体火箭发动机推力室设计。
更新日期/Last Update:
1900-01-01