TY -的A2 Caesarendra Wahyu AU -杨,Yongfei AU - Li Wei AU -史,Weidong盟——周,凌盟——张温泉PY - 2020 DA - 2020/06/16 TI -试验研究影响性能的不稳定特性和高压水下空化射流SP - 1701843六世- 2020 AB -高压水下空化射流广泛用于材料喷砂、石油钻井、海洋工程。空化强度较大的射流的冲击性能与工作条件和喷嘴几何形状等因素有关。为了揭示喷嘴扩角与射流压力对射流非定常特性的关系，采用200fps帧率的高速摄影对空化云图像进行记录。利用MATLAB开发的灰度分析算法研究了注入条件对空化气泡特殊结构、非定常特性和脱落频率的影响。利用高响应压力传感器记录了不同空化数和空化距离下空化射流的冲击载荷特性。研究发现，空化数是影响淹没射流空化形态的主要因素。空化数越低，空化越强烈。缩扩喷管出口扩角对空泡云的发展也有重要影响。在出口扩角为40度、80度和120度的三个喷嘴中，采用扩角为40度的喷嘴形成的气泡浓度最高，而高浓度空泡泡只分布在喷嘴出口很小的范围内。使用喷嘴所产生的蛀牙发散角为80°可以达到好的结果的浓度和分布范围,而喷嘴发散角为120°有较低的空化性能由于缺乏约束的出口加剧喷气机的剪切应力。 According to the result of frame difference method (FDM) analysis, the jet cavitation is mainly formed in the vortex structure generated by the shearing layer at the nozzle exit, and the most severe region in the collapse stage is the rear end of the downstream segment after the bubble cloud sheds off. The impact load of the cavitation jet is mainly affected by the stand-off distance of the nozzle from the impinged target, while the nozzle outlet geometry also has an effect on the impact performance. Optimizing the stand-off distance and the outlet geometry of the nozzles is found to be a good way to improve the performance of the cavitation jet. SN - 1070-9622 UR - https://doi.org/10.1155/2020/1701843 DO - 10.1155/2020/1701843 JF - Shock and Vibration PB - Hindawi KW - ER -