基于流固耦合算法的不同材料网板水动力试验

Hydrodynamic experiment of different materials otter board based on fluid-structure coupling algorithm

拖网网板的水动力模型试验结果会因加工工艺、加工方式、加工材料和试验条件等多种因素出现不同程度的试验偏差。为探究网板模型不同加工材料对水动力试验的影响机理,选取双开缝矩形曲面网板为研究对象,基于流固耦合算法结合动水槽模型试验,分析丙烯腈-丁二烯-苯乙烯共聚物(ABS)、聚丙烯(PP)、聚氯乙烯(PVC)3种3D打印材料网板模型与传统钢质网板模型的结构响应差异及其对水动力试验的影响规律。结果显示:采用传统金属材料(钢)与非金属材料(ABS)加工的网板模型在结构响应及水动力性能方面均具有显著差异,且随冲角和流速的增加,网板模型的最大变形量增加,进而导致升/阻力系数差异也进一步增加;PVC材料因其弹性模量较大、刚性较强,结构响应与金属材料较为接近,因而对水动力试验结果影响较小。基于上述结果,开展网板水动力模型试验时,可选用PVC作为3D打印材料,但需确保模型制作精度,避免模型材料对水动力试验结果精度的影响。

The results of hydrodynamic model experiment of otter board will have different degree of test deviation due to various factors such as processing method and structure simplification.In order to explore the influence mechanism of the processing materials of the otter board model on the hydrodynamic experiment,the double-slit rectangular curved otter board was selected as the research object.Based on the fluid-structure coupling algorithm combined with the flume tank model experiment,the influence on the hydrodynamic experiment and its structural response difference between the three 3D printing materials otter board and the traditional steel materials otter board was analyzed.The results show that there are significant differences in structural response and hydrodynamic performance between the traditional metal(Steel)and non-metal(ABS)models.With the increase of the angle of attack and the flow rate,the maximum deformation of the otter board increases,and the difference of lift coefficient and drag coefficient also increases.Due to the large elastic modulus and strong rigidity of PVC material,the structural response is close to that of metal material,so it has little influence on the results of hydrodynamic experiment.Based on the above results,PVC can be used as the 3D printing material to ensure the accuracy of the model and reduce the influence of the model material on the accuracy of the hydrodynamic experiment results.