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[1]胡仁众,李小明,王 昕.入口压力对汽蚀管流阻系数测量的影响[J].火箭推进,2019,45(02):20-25.
　HU Renzhong,LI Xiaoming,WANG Xin.Effect of inlet pressure on measurement of flow resistance coefficient of cavitating venturi[J].Journal of Rocket Propulsion,2019,45(02):20-25.
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入口压力对汽蚀管流阻系数测量的影响

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V] 卷: 45 期数: 2019年02期 页码: 20-25 栏目: 研究与设计 出版日期: 2019-04-30
Title:
Effect of inlet pressure on measurement of flow resistance coefficient of cavitating venturi
文章编号:
1672-9374(2019)02-0020-06
作者:
胡仁众; 李小明; 王 昕
(西安航天动力研究所,陕西 西安 710100)
Author(s):
HU Renzhong; LI Xiaoming; WANG Xin
(Xi'an Aerospace Propulsion Institute, Xi'an 710100, China)
关键词:
液体火箭发动机;  汽蚀管;  入口压力;  流阻系数;  修正方法
Keywords:
liquid rocket engine;  cavitating venturi;  inlet pressure;  flow resistance coefficient;  correction method
分类号:
V434.3
文献标志码:
A
摘要:
汽蚀管流阻系数测量值是液体火箭发动机性能计算和调整的直接依据。针对液流试验中某些汽蚀管入口压力无法加压至额定值的问题,建立了流阻系数分析模型,研究了汽蚀管入口压力对流阻系数测量的影响,得出了流阻系数随入口压力变化的关系式及入口压力对流阻系数影响的修正公式,并对测量流阻系数的五级压力试验方法进行了评估。结果表明:入口压力增大,喉部等效流通面积减小,流阻系数增大; 流阻系数随入口压力倒数的减小近似线性增大; 额定入口压力两侧对称压力下的流阻系数偏差不同,压力减小引起的流阻系数偏差大于压力增大引起的偏差; 五级流量法测定的流阻系数偏小,选取五级入口压力应尽量靠近额定入口压力或不对称选取; 当试验入口压力均低于额定入口压力时,采用修正方法修正流阻系数测量值,可有效减小其偏差。
Abstract:
The measured flow resistance coefficient of cavitating venturi is the direct basis for the performance calculation and adjustment of liquid rocket engine.Aiming at the problem that the inlet pressure of some cavitating venturis could not be pressurized to the rated value in liquid flow test, the analysis model of flow resistance coefficient was established and the effect of inlet pressure of cavitating venturi on the measurement of flow resistance coefficient was studied. The relationship between the flow resistance coefficient and the inlet pressure was obtained as well as the related correction formula.In addition, the five-stage pressure test method for measuring flow resistance coefficient was evaluated.The research results show that with the increase of inlet pressure, the throat equivalent circulation area of cavitating venturi decreases and the flow resistance coefficient increases.The flow resistance coefficient increases approximately linearly with the decrease of reciprocal inlet pressure.The deviation of flow resistance coefficient is different under the symmetrical pressure on both sides of the rated inlet pressure, and the deviation of flow resistance coefficient caused by inlet pressure decrease is greater than the deviation caused by inlet pressure increase.The flow resistance coefficient measured by the five-stage flow method is small, so the inlet pressure of the five-stage inlet pressure should be selected as close as possible to the rated inlet pressure or asymmetrically.When all inlet pressures are all lower than the rated inlet pressure in liquid flow test, the deviation can be effectively reduced by correcting the measured value of flow resistance coefficient.

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备注/Memo

收稿日期:2018-04-22; 修回日期:2018-11-01 基金项目:装备预研联合基金(61401B06240601) 作者简介:胡仁众(1994—),男,硕士,研究领域为液体火箭发动机

更新日期/Last Update: 2019-04-30