CAJ | 학술논문

以流道内旋涡区为研究对象，采用计算软件FLUENT ，选用标准 k －ε模型对4种流易下的矩形迷宫灌水器流场与旋涡区涡旋强度、压力变化等进行数值模拟分析，将计算结果使用TECPLOT 以及 AUTOCAD 进行处理。结果表明，矩形迷宫灌水器内水流由较大流速的主流区与封闭的旋涡区组成，旋涡区一方面可以增强灌水器的消能效率与抗堵塞性能，另一方面由于零速区的存在易引起灌水器堵塞，流量变化对旋涡区流动没有影响；流量与旋涡区面积和涡旋强度呈正相关关系，同时旋涡中心点位置随着流量增大逐渐偏离灌水器壁面并向下游移动，所以在流道优化中应对公称流量下流道内旋涡区进行优化，旋涡区压力由边界向中心逐渐降低，在旋涡中心处降至最低，压力降低速度随着流量的增大而加快。
이류도내선와구위연구대상，채용계산연건FLUENT ，선용표준 k －ε모형대4충류역하적구형미궁관수기류장여선와구와선강도、압력변화등진행수치모의분석，장계산결과사용TECPLOT 이급 AUTOCAD 진행처리。결과표명，구형미궁관수기내수류유교대류속적주류구여봉폐적선와구조성，선와구일방면가이증강관수기적소능효솔여항도새성능，령일방면유우령속구적존재역인기관수기도새，류량변화대선와구류동몰유영향；류량여선와구면적화와선강도정정상관관계，동시선와중심점위치수착류량증대축점편리관수기벽면병향하유이동，소이재류도우화중응대공칭류량하류도내선와구진행우화，선와구압력유변계향중심축점강저，재선와중심처강지최저，압력강저속도수착류량적증대이가쾌。
Plugging in drip irrigation emitters directly influences the efficiency of the system , and even makes the system scrapped .Plugging mainly starts from the area of vortex ,so this paper uses the area of vortex as the research object .On the basis of the calculation software FLUENT and the model of k‐ε,the flow in rectangular labyrinth ,strength of vortex and pressure variation were analyzed ,and treated by TECPLOT and AUTOCAD .The results show that :1)The flow in rectangular labyrinth emitter is constituted by the main flow area with higher flow‐rate and closed area of vortex ;2)The area of vortex on one hand can enhance the efficiency and anti‐clogging ,on the other hand it can plug the emitter ;3)The flow variation has no effect on the flow in the area of vortex .There is a positive correlation between flow area of the vortex and strength of vortex .The position of central point deviates the boundary and goes dow nstream as the flow increases .T he maximum flow should be used in optimization of the area of vortex in channel .4)The pressure in the vortex decreases from the boundary to the center of vortex and is the lowest in the center of the vortex .The rate of pressure drop speeds up with the increase of the flow .