摘要
本文采用VOF多相流模型,在400 MPa工作压力下,针对3种不同结构喷嘴产生的自由水射流流场进行了数值模拟和试验研究。结果表明:喷嘴出口处空气向喷嘴内部卷吸,一定程度上提高了其集束性;射流核心区轮廓呈现粗细交替的波动状,是诱发射流破碎的重要因素;射流上游的湍动能大小及旋涡强度对射流的集束性影响显著;该条件下射流轮廓的高速数码摄像照片定性地验证了数值模拟的结果。
In this paper,the VOF Model was used to simulate water jet free flow from three nozzles with different structures under the pressure of 400 MPa.In addition,an experiment was conducted under the same condition.The results show that the air entrained into the interior of the nozzle from the environment,to some extent,improved the coherence of the iet.The thickness alternation of the outhne in the core of the water jet is an important factor in inducing its breakup.The intensity of turbulent kinetic energy and vortex in the upstream of the water jet can significantly affect its concentration.Photos of the shape of the water jet from high-speed digital camera qualitatively validated numerical simulation results.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2014年第8期1526-1529,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51176065)
江苏省研究生科研创新基金项目(No.CXZZ11_0567)
关键词
超高压水射流
集束性
VOF
数值计算
ultrahigh-pressure water jet
coherence
VOF
numerical simulation
