摘要
针对高压补燃循环发动机泵间管路中高温氧气再液化回收时的安全问题,建立了高温氧气与高温液氧在低温液氧中掺混冷凝的三维数值仿真模型,研究了泵间管内三股流体掺混冷凝的全过程,获得了管内流场、气液相分布、气相冷凝长度等关键信息,对比了由掺混腔和主管路注入回流高温液氧两种回液方案对氧气冷凝的影响。同时,针对定流速和变流速两种情况,探究了掺混孔数量和孔径的优化方案;此外,对不同管路出口背压下管内气相完全冷凝长度的变化趋势进行了研究。研究表明:掺混腔回液方案会导致气相流量增加和分布不均,不利于管内气相快速冷凝;主管路回液方案能够避免回流高温液氧对气相冷凝的负面影响,推荐采用此方案回收高温液氧;当流速不变时,适度增大掺混孔有利于避免不同掺混孔的气相融合,采用8个孔径为35 mm的掺混孔可使完全冷凝长度缩短26.5%;通过减小孔径增大流速有利于气相快速冷凝,采用16个孔径为20 mm的掺混孔可使完全冷凝长度缩短38.6%;增大泵间管出口背压有利于气相冷凝,背压由1.6 MPa上升至1.8 MPa时,完全冷凝长度缩短28.9%。该研究结果对液体火箭发动机增压输送管路设计具有理论参考意义。
In order to address the safety issue of high-temperature oxygen re-liquefaction and recovery in the inter-pump tube of engine in the staged combustion cycle,a three-dimensional numerical simulation model was developed for the mixing and condensation of high-temperature oxygen and high-temperature liquid oxygen(LO x)in cryogenic liquid oxygen.The process of mixing and condensation of the three flows in the inter-pump tube was studied,and key information including the flow field,gas-liquid distribution,and gas-phase condensation length in the tube was obtained.The effect of two reflux schemes,high-temperature LO x injection from the mixing chamber or the main tube,on the condensation of oxygen was compared,and the optimal scheme was selected.Meanwhile,the optimization design about number and diameter of mixing holes was investigated for both constant and variable oxygen flow rate conditions.Furthermore,the trend of complete condensation length of oxygen in the tube under various back pressures at the tube outlet was investigated.This research shows that the liquid reflux from the mixing chamber is detrimental to the rapid gas condensation in the tube owing to the increased flux and uneven distribution of the gas phase;the liquid reflux from the main tube is recommended for high-temperature LO x collection as it is able to avoid the negative impacts of high-temperature LO x on gas condensation;moderately large mixing holes helps to avoid the vapor fusion from different mixing holes at constant flow rate,and using 8 mixing holes with a size of 35 mm shortens the complete condensation length by 26.5%;increasing the flow speed by reducing the hole diameter facilitates the rapid condensation of the gas phase,and using 16 mixing holes with a size of 20 mm shortens the complete condensation length by 38.6%;the increased back pressure at the inter-pump tube outlet contributes to the gas phase condensation,and the complete condensation length is shortened by 28.9%by increasing the back pressure from 1.6 MPa to 1.8 MPa.The r
作者
孙强
谢福寿
张淼
厉彦忠
SUN Qiang;XIE Fushou;ZHANG Miao;LI Yanzhong(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Science and Technology on Liquid Rocket Engine Laboratory,Xi’an Aerospace Propulsion Institute,Xi’an 710100,China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2023年第7期169-178,共10页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(51876153)
中国博士后科学基金资助项目(2021T140538)
中央高校基本科研业务费专项资金资助项目(XZY012020074)。
关键词
泵间管路
直接接触冷凝
高温氧气
高温液氧
掺混孔
背压
inter-pump tube
direct contact condensation
high-temperature oxygen
high-temperature liquid oxygen
mixing holes
back pressure
