As a new processing method, water jet processing technology has risen rapidly due to its wide range of applications, no pollution, and zero discharge. In this paper, the flow characteristics and failure characteristics of ultra-high-pressure gas-liquid jet in the range of 300 MPa are analyzed by numerical calculation. The research conclusion shows that the jet atomization diffusion is caused by the friction between the liquid medium and the surrounding gas, the mixed flow of broken water droplets and cavitation. The jet diffusion process is essentially the energy exchange process between the jet in the core area and the turbulent flow in the atomization area. The distribution of the turbulent kinetic energy in the atomization area can determine the degree of jet diffusion and the rate of energy decay. The water jet impacted the surface of the target to form a crater-like annular erosion pit. With the increase of the impact pressure, the deformation showed an overall increasing trend, and the increasing trend increased significantly. The central depression of the erosion area is caused by the damage of the material by the stagnation pressure in the core area. The flow characteristics of gas-liquid flow in the process of formation and diffusion in the high-pressure water jet nozzle are explored from the microscopic point of view, and it also provides a theoretical basis for equipment optimization in engineering.

中文翻译：

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水射流喷嘴流场特性及目标撞击表面损伤研究

水射流加工技术作为一种新的加工方式，以其应用范围广、无污染、零排放等优点迅速崛起。本文通过数值计算分析了超高压气液射流在300 MPa范围内的流动特性和失效特性。研究结论表明，射流雾化扩散是由液体介质与周围气体的摩擦、破碎水滴的混合流动和空化作用引起的。射流扩散过程本质上是核心区射流与雾化区湍流之间的能量交换过程。雾化区湍动能的分布可以决定射流扩散的程度和能量衰减的速度。水射流撞击目标表面，形成一个类似火山口的环形侵蚀坑。随着冲击压力的增大，变形量整体呈增大趋势，且增大趋势明显增大。侵蚀区的中心凹陷是由于核心区的滞压对材料的破坏造成的。从微观角度探讨了高压水射流喷嘴在形成和扩散过程中气液流动的流动特性，也为工程中的设备优化提供了理论依据。侵蚀区的中心凹陷是由于核心区的滞压对材料的破坏造成的。从微观角度探讨了高压水射流喷嘴在形成和扩散过程中气液流动的流动特性，也为工程中的设备优化提供了理论依据。侵蚀区的中心凹陷是由于核心区的滞压对材料的破坏造成的。从微观角度探讨了高压水射流喷嘴在形成和扩散过程中气液流动的流动特性，也为工程中的设备优化提供了理论依据。