中文摘要：

采用双向耦合法研究了一种新型流体脉动衰减弯头,讨论了结构参数对其流固耦合特性的影响.结果表明：原始弯头内总压差为29.50627kPa,内部流场极不均匀,其最大变形量为20.689μm,最大应力为180.08kPa,变形方式是两侧拉长、中间向里凹陷,呈双椭圆形,对其具有＂拉直＂效应;当导流器按黄金比例排列,片数为2,横截面弯曲半径为200mm,出口延长度为40mm设计时,优化结构内总压差为10.70787kPa,比原始弯头减小了63.71%,但该结构最大变形为330.39μm,最大应力为1569.10kPa;最终方案增加导流器片数至3片,导流器厚度为3mm,优化后结构内总压差为12.46956kPa,比原始弯头减小了57.74%,其最大变形为20.898μm,最大应力为259.80kPa,且内部流场均匀.

英文摘要：

A novel fluid pulsation attenuation elbow was studied by the bidirectional coupling method,and the effects of structural parameters on its fluid-solid interaction characteristics were discussed. The results show that the internal total pressure difference is 29.506 27 kPa in the original elbow,the internal flow field is very uneven,the maximum deformation is 20.689 μm,the maximum stress is 180.08 kPa,and the deformation mode is that the structure is elongated in both sides,concaved in the middle and shows a double oval,and the deformation leads to the flare-out effect on the elbow. When guide plates are designed according to the golden ratio,the number,the radius and the length are 2 200 mm and 40 mm respectively,the total pressure difference is 10.707 87 kPa,it decreases by 63.71% in comparison with the result of the original elbow,but the maximum deformation is 330.39mm,and the maximum stress is 1 569.10 kPa. When the number of guide plates is 3,and the thickness is 3 mm in the final optimized structure,the internal total pressure difference is 12.469 56 kPa,it decreases by 57.74% in comparison with the result of the original elbow,the maximum deformation is 20.898 mm,the maximum stress is 259.80 kPa,and the internal flow field is very even.