基于动网格的液压活塞二级缸动态压缩性能

Dynamic Compression Performance of Hydraulic PistonSecondary Cylinder Based on Dynamic Mesh

为了研究液压活塞压缩机压缩气体的动态压缩过程,探究压缩机结构参数与压缩机压缩性能的关系,以撬装式井口天然气回收处理系统的液压活塞式压缩机二级缸为研究对象,基于液压活塞式压缩机二级缸工作原理,将仿真过程划分为3个阶段分步模拟,借助Fluent软件,结合动网格和UDF(user defined functions)编译进行仿真分析,明确了二级缸内天然气的动态压缩过程,并将活塞运动作为压缩机压缩性能的评判指标,得到了二级缸结构参数对压缩机压缩性能的影响。研究表明:工作行程和下气缸出口分布与压缩性能关系不大,而下气缸出口大小的增大对压缩性能有较大提升,范围内最大增幅47.6%。相关研究为液压活塞式压缩机的优化与设计提供一定的参考。

In order to study the dynamic compression process of compressed gas in hydraulic piston compressor,the relationship between compressor structural parameters and compressor compression performance was explored.The secondary cylinder of a hydraulic piston compressor in a company's product,the pry-mounted wellhead natural gas recovery and treatment system,was taken as the research object.Based on the working principle of the secondary cylinder of the hydraulic piston compressor,the simulation process was divided into three stages,and the simulation was analyzed by Fluent software combined with the dynamic grid and UDF(user defined functions)compilation.The dynamic compression process of natural gas in the two-stage cylinder was defined,and the piston movement was taken as the evaluation index of the compressor compression performance,and the influence of the structural parameters of the two-stage cylinder on the compressor compression performance was obtained.The results show that the working stroke and lower cylinder outlet distribution have little relationship with the compression performance,and the increase of lower cylinder outlet size has a great improvement on the compression performance,and the maximum increase is 47.6%.The relevant research provides some reference for the optimization and design of hydraulic piston compressor.