The gas/liquid spiral separator, a key component in the compressed air system, was used to remove liquid and oil from gas stream by centrifugal and gravitational forces. To optimize the design of the separator,the rel...The gas/liquid spiral separator, a key component in the compressed air system, was used to remove liquid and oil from gas stream by centrifugal and gravitational forces. To optimize the design of the separator,the relationship between the performance and structural parameters of separators is studied. Computational fluid dynamics (CFD) method is employed to simulate the flow fields and calculate the pressure drop and separation efficiency of air-liquid spiral separators with different structural parameters. The RSM (Reynolds stress model)turbulence model is used to analyze the highly swirling flow fields while the stochastic trajectory model is used to simulate the traces of liquid droplets in the flow field. A simplified calculation formula of pressure drop in spiral structures is obtained by modifying Darcy's equation and verified by experiment.展开更多
依据现有螺旋导叶和气液分离器结构的设计方法,建立筒径300 mm的轴流式螺旋导叶气液分离器模型,在直流和逆流两种排气方式下,对0、1、2、4、6 mm 5组导叶环隙宽度进行数值模拟,研究导叶环隙宽度对内流场的影响,并通过试验对比分析导叶...依据现有螺旋导叶和气液分离器结构的设计方法,建立筒径300 mm的轴流式螺旋导叶气液分离器模型,在直流和逆流两种排气方式下,对0、1、2、4、6 mm 5组导叶环隙宽度进行数值模拟,研究导叶环隙宽度对内流场的影响,并通过试验对比分析导叶环隙宽度对分离性能的影响。模拟结果表明:导叶环隙宽度增大,压降和切向速度逐渐降低,环隙流量占比逐渐增大;综合考虑压降和离心分离作用,1~2 mm是较适宜的环隙宽度。试验结果表明:相对于无环隙结构,1~2 mm的环隙宽度不但能减小导叶区域的流通阻力,降低设备压降,减小能耗,还有利于疏通贴壁液膜的下行流动,防止液膜汇聚在导叶尾端形成雾沫夹带,从而提高分离效率。展开更多
文摘The gas/liquid spiral separator, a key component in the compressed air system, was used to remove liquid and oil from gas stream by centrifugal and gravitational forces. To optimize the design of the separator,the relationship between the performance and structural parameters of separators is studied. Computational fluid dynamics (CFD) method is employed to simulate the flow fields and calculate the pressure drop and separation efficiency of air-liquid spiral separators with different structural parameters. The RSM (Reynolds stress model)turbulence model is used to analyze the highly swirling flow fields while the stochastic trajectory model is used to simulate the traces of liquid droplets in the flow field. A simplified calculation formula of pressure drop in spiral structures is obtained by modifying Darcy's equation and verified by experiment.