Impingement capability of high-pressure submerged water jet: Numerical prediction and experimental verification
Impingement capability of high-pressure submerged water jet: Numerical prediction and experimental verification作者机构：School of Material Science and Engineering Jiangsu University School of Energy and Power Engineering Jiangsu University
出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)
年 卷 期：2015年第22卷第10期
页 面：3712-3721页
核心收录：
学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）]
基 金：Projects(51205171,51376081)supported by the National Natural Science Foundation of China Project(1201026B)supported by the Postdoctoral Science Foundation of Jiangsu Province,China
主 题：submerged water jet cavitation shear effect impingement test micro hardness surface morphology
摘 要：At jet pressures ranging from 80 to 120 MPa, submerged water jets are investigated by numerical simulation and experiment. Numerical simulation enables a systematic analysis of major flow parameters such as jet velocity, turbulent kinetic energy as well as void fraction of cavitation. Experiments facilitate an objective assessment of surface morphology, micro hardness and surface roughness of the impinged samples. A comparison is implemented between submerged and non-submerged water jets. The results show that submerged water jet is characterized by low velocity magnitudes relative to non-submerged water jet at the same jet pressure. Shear effect serves as a key factor underlying the inception of cavitation in submerged water jet stream. Predicted annular shape of cavity zone is substantiated by local height distributions associated with experimentally obtained footprints. As jet pressure increases, joint contribution of jet kinetic energy and cavitation is demonstrated. While for non-submerged water jet, impingement force stems exclusively from flow velocity.
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