摘要
为了研究高弗劳德数时,调控通气量过程中空泡形态的时间迟滞特性,本文建立了定量求解通气超空化的三维数值模型。基于CFX平台,结合分相流模型、SST湍流模型和Rayleigh-Plesset空化模型,运用二次开发语言CEL嵌入通气量变化规律,研究了变通气量(突增、突降、周期性变化)对空泡形态的影响。结果表明:通气量变化时,空泡特征尺度变化表现出时间迟滞特性;通气量突降时,时间迟滞特性最强,空泡特征尺度需2.3 s达到稳定;通气量突增时,空泡特征尺度需1.3 s达到稳定,时间迟滞特性较弱;通气量周期性变化时,在通气量改变前、后空泡发展趋势的共同作用下,空泡特征尺度初始变化不具周期性。研究成果可为通气超空泡航行器工程应用中通气量调控方案的提出提供参考。
In order to study the time lag characteristics of cavitation morphology in the process of regulating ventilation at high Froude number,a three-dimensional numerical model for quantitatively solving ventilation supercavitation was established based on CFX platform,combined with the inhomogeneous multiphase flow model,SST turbulence model,and the Rayleigh-Plesset cavitation model.Then,the influence of variable ventilation flow rate(sudden increase,sudden drop,and periodic change)on cavity shape was investigated by embedding the variation law of air volume with CEL.Results show that when the ventilation volume changes,the cavitation characteristic scale changes,thus indicating time hysteresis.When the ventilation volume drops suddenly,the time hysteresis characteristic is the strongest,and the cavitation characteristic scale needs 2.3 s to stabilize.Meanwhile,when the ventilation volume suddenly increases,the cavitation characteristic scale needs 1.3 s to stabilize,and the time hysteresis characteristic is weak.Finally,under the combined action of cavitation development trend before and after the ventilation change,the initial variation of cavi-tation characteristic scale is not periodic when the ventilation changes periodically.The research results can provide a reference for designing ventilation control schemes in the engineering applications of ventilated supercavity vehicles.
作者
罗凯
左振浩
许海雨
刘富强
叶常盛
黄闯
LUO Kai;ZUO Zhenhao;XU Haiyu;LIU Fuqiang;YE Changsheng;HUANG Chuang(School of Marine Science and Technology, Northwestern Polytechnical University, Xi′an 710072, China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2022年第4期495-502,共8页
Journal of Harbin Engineering University
基金
国家自然科学基金项目(51909218)
中国博士后基金项目(2019M653747).
关键词
通气超空泡
通气率
空泡形态
迟滞特性
多相流
可压缩气体
高弗劳德数
数值模拟
ventilated supercavity
ventilation flow rate
cavity shape
hysteresis
multiphase flow
compressible gas
high Froude number
numerical simulation
