CAJ | 학술논문

电动截止阀是流体输送的重要元件．阀的传统设计方法很少从流体角度对其流道进行设计，其流阻系数比较大，容易造成局部压力损失．流体介质通过阀口时。流动方向发生变化，可能产生诸如局部涡流、空化、水锤和死水区等水流现象及湍流脉动噪声，对阀体有很强的破坏性，降低阀的使用寿命．基于RAN—S方程组和RNGk-8湍流模型，利用CFD技术对全开启状态下的电动截止阀的内流道进行三维的湍流数值模拟，获得其总压图、速度矢量图、湍动能强度图．通过数值模拟，可以直观地显示阀的内流道中流体的流动过程．改变进出口段流道的长度、曲率以及阀杆在流道中的布局等，进出口的压力差相对于未改进前减少30％左右，速度突变区域明显缩小，局部涡流现象消失，湍动能强度也降低了15％左右．
전동절지벌시류체수송적중요원건．벌적전통설계방법흔소종류체각도대기류도진행설계，기류조계수비교대，용역조성국부압력손실．류체개질통과벌구시。류동방향발생변화，가능산생제여국부와류、공화、수추화사수구등수류현상급단류맥동조성，대벌체유흔강적파배성，강저벌적사용수명．기우RAN—S방정조화RNGk-8단류모형，이용CFD기술대전개계상태하적전동절지벌적내류도진행삼유적단류수치모의，획득기총압도、속도시량도、단동능강도도．통과수치모의，가이직관지현시벌적내류도중류체적류동과정．개변진출구단류도적장도、곡솔이급벌간재류도중적포국등，진출구적압력차상대우미개진전감소30％좌우，속도돌변구역명현축소，국부와류현상소실，단동능강도야강저료15％좌우．
Electric check valve is an important component of the liquid transportation. Due to the traditional design of the valve rarely design the interal flow channel, standing in the point of the fluid flow, the flow resistance coefficient is bigger, easy to cause the certain local pressure loss.The flow direction of the fluid is changing when it passed through the mouth of the valve, and there would be the flow phenomenon, which make the valve strong destructive and reduce the service life of the valve, such as local eddy current, cavitation, water hammer and dead zones, Turbulent pulse noise, etc. The interal flow channel of the Electric check valve that is in the state of the all open is numerically simulated with CFD approach based on Reynolds-aver- aged N-S equations （RANS equations） and RNG k-v model,and the total pressure figure, velocity vector diaigram, turbulence intensity map are obtained. Through numerical simulation, the flow process of the fluid in the valve can be directly displayed.It can reduce the pressure loss of the import and export around 30%, narrow the area of the mutational speed, make the phenomenon that the local eddy current disappeared, and lessen the intensity of turbulence around 15%, by improvement designing, such as change the length and curvature of the import and export part of flow channel, and alter the layout of stem of valve, etc.