Experiment Test And Numerical Simulation On The Atomization Process Of Air-blast Nozzles

CWS gasification technology is one of the pivotal technologies of Clean Coal Use.CWS is a kind of clean fuel which has crude advantage as material of gasification.Atomization is the key technology in CWS gasification.The air-blast atomizers are the ones which are most extensively used in the CWS gasification field because of their advantages such as favorable atomization performance, good applicability for many liquid fuels and simple structure and so on, to study the atomization process and mechanism of air-blast atomizers have important theory significance and engineering application background for the exploitation of new style of air-blast atomizers of CWS.The paper mainly researches on the atomization process and mechanism of two-channel and three-channel air-blast nozzles, mostly including the following:Firstly, taking droplet size SMD as the estimate target, the paper studies the facors which influence the atomization performance of two-channel nozzle such as operation parameters, structure size and the viscosity of liquid, and then adopt the high-speed camera to observe the breakup of liquid stream and analyze the atomizatiom mechanism of two-channel nozzle.Secondly, taking droplet size SMD as the estimate target, the paper studies the facors which influence the atomization performance of three-channel nozzle such as operation parameters, structure size and the viscosity of liquid, and then adopt the high-speed camera to observe the breakup of liquid stream and analyze the atomizatiom mechanism of three-channel nozzle.Finally, the FLUENT software is introduced to study the atomization process of two-channel nozzle. At first, the paper simulates the flow field of compressible air inner the nozzle, and then employs VOF model to simulate the flow field of gas-liquid mixture outer the nozzle, and lastly uses DPM model to simulate the breakup process of liquid stream successfully.