输液管路弯头固-液耦合动力学研究

Study on solid-liquid coupling dynamics of the liquid-conveying pipeline elbow

研究一种新型输液管路弯头,对其固-液耦合动力特性进行了数值计算,分析了导流器不同结构参数对其导流特性的影响,并校准了输液管路弯头的强度与刚度要求。研究结果表明:原始弯头的内部总压差为29 506.27 Pa,最大变形量为2.068 9×10-5m,其变形方式是两侧拉长,中间向里凹,呈双椭圆形,对弯头具有"拉直"效应;当导流器按黄金比例排列,片数N为2,横截面弯曲半径R为200 mm,出口延长度L为40 mm设计时,其内部总压差为10 707 Pa,比原始弯头减小了63.71%,该优化结构的最大变形量为3.303 9×10-4m,亦能满足强度与刚度要求,由于导流器弧度的存在使得导流器向外侧偏移而变形。

A new type of liquid-conveying pipeline elbow was studied,its solid-liquid coupling dynamic characteristics were numerically simulated,the influences of structural parameters of its guide plates on the guide characteristics were analyzed,and on this basis,the strength and rigidity of the liquid-conveying pipeline elbow were calibrated.The results show that the internal total pressure difference in the original pipeline elbow without the guide plates is 29506.27Pa,the maximum deformation is 2.0689 10-5m,and the deformation mode is that the texture is elongated on both sides,concave in the middle and shows itself as a double oval.The deformation leads to the flare-out effect on the elbow.When the guide plates are designed according to the golden ratio,the number,the radius and the length of the guide plates are 2,200mm and 40mm respectively,the internal total pressure difference is 10707Pa,which decreases by 63.71% compared with the result of the original pipeline elbow without the guide plates and its maximum deformation is 3.3039 10-4m.This optimal structure can also meet the strength and rigidity requirement.The are structure of the guide plate leads to the guide plates offset toward the outer flank.