气泡雾化喷嘴气液两相流体混合流动的数值模拟

Numerical simulation of gas-liquid two-phase flow in effervescent atomizer

利用ANSYS建立了气泡雾化喷嘴的三维模型,应用CFD技术模拟分析了不同气液比和喷嘴结构参数等因素对气液混合流动的影响.结果表明:建立的模型可有效模拟气液混合流动过程;气液混合流动中存在一个最佳气液比使气液混合最好;混合室长度越长不利于气液混合;小孔数目越多,产生的气泡越多;小孔直径较小,混合较好;进气直径大,进液直径小,出口直径越小,越有利于气液混合.

A three dimensional computational model for the effervescent atomizer was estab‐lished by utilizing ANSYS ,the influence of different ALR values and effervescent atomizer parameters were analyzed by applying CFD technique .The simulation results indicated that the established model could explain the internal mixed flow of effervescent atomizer well . There was existing an optimum ALR for gas‐liquid mixed flow ;the length increase of the mixing chamber is not conducive to the gas‐liquid mixing ,the more the number of holes ,the more bubbles generated ,as diameter , the smaller hole diameter , bigger air‐in diameter , smaller water‐in diameter ,smaller outlet diameter ,make the better internal mixing .