摘要
喷嘴作为高压水射流的关键部件,其结构和工作参数对高压水喷射反推性能具有重要影响。以圆柱、圆锥和余弦三种不同结构喷嘴为研究对象,基于CFD对定容积下不同结构喷嘴的高压水非定常喷射过程进行数值模拟,对比分析了不同结构喷嘴的射流反推特性,系统研究了充气压力、出口直径对喷嘴非定常喷射速度和反推力的影响规律。结果表明:相比圆柱喷嘴,圆锥喷嘴和余弦喷嘴的射流反推性能更好,同等条件下余弦喷嘴的喷射反推力要比圆锥喷嘴高17%左右;提高充气压力将会缩短喷射时间,显著增大高压水喷射的速度和反推力;喷嘴出口直径的改变对喷嘴最大射流速度的影响不大,但会显著缩短喷射时间,并有助于提高喷嘴的喷射反推力。上述研究为高压水喷射反推的技术应用提供借鉴。
As key component of water jet,the structure and working parameters of nozzle have an important influence on performance of high-pressure water jet reverse thrust.Taking cylindrical,conical and cosine nozzles as research object,numerical simulation of the high-pressure water unsteady jetting process of different nozzles under constant volume is carried out based on CFD,and the jet thrust characteristics of different nozzles are compared and analyzed.The influence of pressure and outlet diameter on unsteady jet velocity and reverse thrust is investigative.The results show that jet thrust performance of conical nozzles and cosine nozzles is better than that of cylindrical nozzles.Under same conditions,the jet thrust of cosine nozzles is about 17%higher than that of conical nozzles.Increasing the inflation pressure will shorten the jetting time and significantly increase the speed and reverse thrust of high-pressure water jet.The change of nozzle outlet diameter has little effect on the maximum jet velocity,but it will shorten the injection time and has a positive effect on improving the jet reverse thrust of the nozzle.Hope the above research will provide a reference for the application of high-pressure water jet reverse thrust.
作者
王广银
张振华
陈彦京
李春萍
吴向阳
李大让
WANG Guang-yin;ZHANG Zhen-hua;CHEN Yan-jing;LI Chun-ping;WU Xiang-yang;LI Da-rang(Military Representative Bureau of the Army Equipment Department the Fifth Military Representative Office in Beijing,Beijing 100039,China;Beijing Research Institute of Special Mechanic,Beijing 100143,China)
出处
《液压气动与密封》
2022年第3期9-14,共6页
Hydraulics Pneumatics & Seals
基金
北京市自然科学基金(3202035)
国家自然科学基金(51805503)。
关键词
喷嘴
水射流
非定常
反推特性
数值模拟
nozzle
water jet
unsteady
reverse thrust characteristics
numerical simulation
