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作 者:李贝贝[1] 刘秀梅[1,2,3] 龙正[1] 贺杰[1] 李文华[1]
机构地区:[1]中国矿业大学机电工程学院,江苏徐州221116 [2]浙江大学流体动力与机电系统国家重点实验室,杭州310027 [3]中国矿业大学江苏省矿山机电装备重点实验室,江苏徐州221116
出 处:《振动与冲击》2015年第21期54-58,共5页Journal of Vibration and Shock
基 金:国家自然科学基金(51209203;51309221;51205391);江苏省自然科学基金项目(BK2012131);浙江大学流体动力与机电系统国家重点实验室(GZKF-201317);江苏高校优势学科建设工程资助项目
摘 要:基于计算流体动力学方法,数值研究了节流阀开度变化对节流阀内油液压力场、速度场及空化区域的影响。流道内压力较大区域位于上流道,压力较小区域位于下流道。节流口处压力梯度随阀口开度减小呈增大趋势;液压油低流速区分布在上游槽底部、阀芯顶端及阀腔拐角处。随着阀口开度减小,在通流截面积和油液黏性阻力共同作用下,通过节流口处流体流速呈先增大后减小趋势;在上游阀座底部、阀芯顶端处、阀腔拐角附近存在三个回流区,该回流区面积随阀口开度减小而减小;由于节流口处气体体积分数较高,因此空化初始位置位于节流口阀座附近,下游空化区则是游离性气泡群造成的。此外,随着开度进一步减小,空化强度呈先增强后减弱趋势,空化区域也呈先扩大后缩小趋势。Based on computational fluid dynamics,characteristics of cavitation flows in a throttle valve with different openings and pressures were studied.The influences of opening on flow pressure,flow velocity and cavitation region were also investigated.The numerical results showed that the maximum pressure is located at the upstream of the flow channel,and the minimum pressure is located at the downstream of the flow channel;the pressure gradient for oil flowing increases with decrease in opening;the low-velocity regin of oil is at the top of valve rod,the corner of the channel and the corner of the valve seat;with decrease in opening,the oil flow velocity passing through the port increases firstly and then decreases under the action of cross-sectional area and oil viscosity;there are three recirculation zones at the top of valve rod,the corner of the channel and the corner of the valve seat,they all decrease with decrease in valve opening;the cavitation initial position is near the valve seat,and the cavitation region at the downstream is caused by uncombined bubble clusters;in addition,with decrease in valve opening,both the cavitation intensity and cavitation region increase firstly and then decrease.
分 类 号:TH137[机械工程—机械制造及自动化] O359[理学—流体力学]
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