单 位：
南京工业大学车辆与工程机械研究所;海南大学机电工程学院
关键词：
多路换向阀;分压;节流槽;通流能力;水力直径;空化特性
摘 要：
异型分压节流槽在分散节流阀口压降集中,减小阀口空化剧烈程度方面具有非常重要的意义。通过分析U型和V型分压节流阀口各自通流截面的水力直径D h,得出了U型节流槽和V型节流槽通流能力方面的差异。通过两种节流槽节流特性的研究发现:对于U型节流槽,当处于较大阀口开度时,其通流能力受到限制,会出现通流性能饱和现象;而对于V型节流槽,其水力直径D h与阀口开度X具有较好线性关系,并且其流量可控性要好于U型节流槽。另外从异型节流阀口的特点出发,推导了适用于分压节流阀口的空化特性计算公式,并在此基础上发现当阀口体积流量Q方向相反时,在阀口过流截面上的空化特性是有差异的;当液流体积流量Q从较大过流截面A1流向相对较小的过流截面A2时,在节流主要截面A2附近的空化指数σ要明显大于当体积流量翻转时在A2附近的空化指数;并从理论上解释了该现象的产生原因。
译 名：
Studies on the Throttling Performance of Non-circumferential Throttling Port
作 者：
Yuan Shihao;Yin Chenbo;Ye Yi;Liu Shihao;Institute of Automobile and Construction Machinery,Nanjing University of Technology;College of Mechanical and Electrical Engineering,Hainan University;
关键词：
Multi-way value Partial pressure Throttling groove Flow ability Hydraulic diameter Cavitation characteristic
摘 要：
Relative to circular throttling port,partial pressure throttling groove is significant for releasing pressure drop contraction in throttling port, and decreasing cavitation probability. For typical non-circumferential throttling ports U groove and V groove,their flow abilities( hydraulic diameters) were studied,and it was observed that for U groove,the flow ability is limited under a larger opening,as actual flow ability is depend on minor hydraulic diameter and it is a fixed value; for V groove,hydraulic diameters has a good linear relationship with port opening that means V groove has a wider flow range than U groove does,in other words,V groove is easier to obtain stable smaller flow rate; based on classic cavitation index,new-form cavitation index calculation formula,which is applicable to partial pressure throttling port,was deduced,and the cavitation indexes of U groove and V groove were calculated respectively,and it was found that whether U or V groove,for different flow directions cavitation indexes are different; when fluid flows from the larger section A1 to section A2 cavitation index near section A2 is remarkly larger than that when fluid reversal. At last,this phenomena was theoretically explained.
