中心体空化喷嘴数值模拟和参数优化  

Numerical Simulation and Parameter Optimization of Center Body Cavitation Nozzle

作　　者：谢文彬 曹秀清 XIE Wenbin;CAO Xiuqing(Department of Mechanical and Electrical Engineering,Huaian Higher Vocational School of Biological Engineering,Huaian 223300,Jiangsu,China;School of Mechanical Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,Jiangsu,China)

机构地区：[1]淮安生物工程高等职业学校机电工程系,江苏淮安223300 [2]江苏科技大学机械工程学院,江苏镇江212003

出　　处：《船舶工程》2024年第8期68-77,共10页Ship Engineering

摘　　要：基于滤波器的密度校正模型(FBDCM)对RNGk-ε模型的湍流黏度进行修正,考虑剪切应力对空泡的影响对空化模型进行修正,在此基础上求解空化射流流场,并将所得结果与试验结果进行对比,验证仿真模型的准确性。建立中心体空化喷嘴几何模型,研究扩张角、收缩段长度、喉管段长度、扩张段长度和中心体缩进距离对喷嘴空化性能的影响。研究结果表明:扩张角、扩张段长度和中心体缩进距离对喷嘴空化性能的影响较大;结构参数引起的射流速度变化导致射流剪切层厚度发生变化,从而影响流场低压区域的分布,使得射流流场空化云出现大小不一的情况;当收缩段长度为4mm、喉管段长度为4 mm、扩张段长度为5 mm、扩张角为60°、中心体缩进距离为1 mm时,喷嘴的空化效果最佳。The turbulent viscosity of the RNG k-model is modified based on the filterbased density correction mode(FBDCM)model,and the cavitation model is modified by considering the influence of shear stress on cavitation formation.Compared with the experimental results,the accuracy of the simulation model is verified.The geometric model of the central body cavitation nozzle is established,and the effects of expansion angle,contraction section,throat section,expansion section and center body retraction distance on cavitation performance are studied.The results show that the expansion angle,the expansion section and the center body retraction distance have a great influence on the cavitation performance.Through in-depth research,it is found that the change of jet velocity caused by the structural parameters leads to the change of the thickness of the jet shear layer,which affects the distribution of the low-pressure area of the flow field,resulting in different sizes of cavitation clouds in the jet flow field.It has been found that the nozzle cavitates best when the contraction cross section is 4 mm,the throat cross section is 4 mm,the expansion cross section is 5 mm,the expansion angle is 60°,and the centre body indentation distance is 1 mm.

关 键 词：中心体空化喷嘴 参数优化 空化射流 数值计算 

分 类 号：TP601[自动化与计算机技术—控制理论与控制工程]