基于动网格技术的气囊式压力波动衰减器动态特性研究

Study on dynamic characteristics of bladder fluid pulsation attenuator based on dynamic mesh technology

为了降低管路压力波动带来的振动和噪声,气囊式压力波动衰减器被广泛用于吸收管路压力波动。首先,通过合理的假设和简化,建立了衰减装置的数学模型和仿真模型;然后,基于FLUENT软件提供的计算方法和物理模型,利用动网格和用户自定义函数(UDF)技术,对气囊变形的过程进行动态模拟,结果表明:流体波动频率与衰减器固有频率一致时衰减效果最好,仿真结果和理论推导结果一致;最后,根据工程实际搭建实验平台,对不同工况下的仿真内容进行实验验证。实验结果表明:实验与仿真基本吻合,验证了该仿真模型的有效性,为气囊式压力波动衰减器参数的研究提供了新方法和新思路。

In order to reduce the vibration and noise caused by pipeline pressure fluctuation,pressure fluctuation attenuator is widely used to absorb pipeline pressure fluctuation.It provides a theoretical basis for selecting parameters reasonably and giving full play to the bladder attenuator function to study the bladder fluid pulsation attenuator.By means of reasonable assumptions and simplification,the mathematical model and simulation model of the attenuation device are established.Based on the calculation method and physical model provided by FLUENT,dynamic mesh and UDF(user defined function)technology are applied to simulate the process of bladder motion.The simulation analysis shows that when the frequency of fluid fluctuation coincides with the natural frequency of the attenuator,the attenuation effect is the best,and the simulation results are consistent with the theoretical deduction results.The experimental platform is built according to the engineering practice,and the simulation contents under different working conditions are verified by experiments.The results show that the experiment is basically consistent with the simulation,thus proving the validity of the simulation model.It provides a new method and a new idea for the study of the parameters of the bladder pressure fluctuation attenuator.