摘要
由于不同喷气形式下微气泡减阻的机理不甚清楚,应用流体计算软件Fluent对简化船体模型进行了数值模拟。采用k-ε湍流模型,对两种来流速度、两种喷气流量和六种喷气形式下减阻率的变化进行了计算,并与水池试验进行对比分析,从微气泡体积分数和两相流速度的分布进行研究,总结出一些理论成果,并且进一步考虑对螺旋桨效率的影响。计算结果表明:首中部同时喷气的减阻效果更好。成果可为微气泡减阻技术的实际应用提供理论指导。
According to the power matching of power mechanism, one form of definition of load flow and load pres- sure is given. On this basis, the mathematical model is applied to both asymmetrical cylinder and symmetrical cyl- inder controlled by servo-valve. A unified mathematical model is presented to solve the asymmetrical of cylinder. And this theory has been testified by simulation. Then the model of position control system of a certain testing platform is built on this method, and the variety effects of system dynamic performance under different parameters and power source are analyzed. Thereby a theory foundation for the optimal design and control policy of the system is provided.
作者
贾郑铭
葛冀欢
曹宣伟
Zheng-zhao GU(Taiyuan Institute of Technology, Taiyuan 030008, Chin)
出处
《机床与液压》
北大核心
2016年第24期75-80,100,共7页
Machine Tool & Hydraulics
基金
partly Wuhan University of Technology independent innovation research fund (No.2016ND-B1-06)
关键词
微气泡减阻
数值模拟
喷气形式
减阻率
Asymmetrical hydraulic cylinder, Mathematical model, Position control system, Simulation analysis
