Optimal Design And Experimental Research On Supersonic Gas-Liquid Mixed Cleaning

With the rapid development of social production,industrial equipment and parts have gradually become more complicated,thus,the complex structure brings great challenges to the cleaning work.The quality of parts cleaning has a direct impact on the performance of industrial products.Existing cleaning methods have the defects of narrow cleaning range and low efficiency,and can’t meet strict cleaning requirements.Therefore,this paper proposes a new type of supersonic gas-liquid mixed cleaning method.The main process of this method is: firstly,accelerate high-pressure high-temperature gas to supersonic speed,secondly the gas atomize the liquid into a small liquid drop and accelerate it to supersonic speed,finally use the supersonic gas and liquid droplets to clean components.This paper mainly studies the realization of supersonic gas and supersonic liquid.In the realization of supersonic gas,the structural parameters of the Laval nozzle are designed according to the geometric conditions of the nozzle,and the gas inlet parameters are designed according to the mechanical conditions of the nozzle.Based on Fluent simulation software,Realizable k-epsilon model is used to simulate gas flow,and the results show that gas flows at supersonic speed;In the realization of supersonic liquid,the gas-liquid drag model is used to calculate the liquid velocity at the nozzle outlet under the optimal gas-liquid inlet parameter.The VOF-to-DPM model was used to simulate the liquid primary atomization process,which combines the advantages of the VOF model and the DPM model to more realistically simulate the process of liquid crushing and atomization,obtained atomized droplet particle information.The DPM model was used to simulate the liquid secondary atomization and acceleration effects.After setting up theoretically optimized gas-liquid parameters and the simulation result of liquid one atomization to the particle information,the supersonic speed can be reached at the nozzle outlet.In theoretical calculations,one-dimensional axial calculation of gas-liquid velocity is used,which reduces the computational resource consumption compared with simulation calculations.A supersonic gas-liquid mixed cleaning equipment was designed and build,which is used to implement cleaning experiments.The test results show that this cleaning method can effectively remove various impurities on the parts.Designed and manufactured a anemometer tube,which can measure the speed of gas in the Laval nozzle outlet.The test results show that the velocity of the gas at the nozzle outlet can reach supersonic speed.In addition,referring to the equipment parameters of foreign literature,the gas-liquid velocity along the nozzle axis was calculated by supersonic gas-liquid theory design software,and the correctness of the supersonic gas-liquid mixing theoretical calculation was qualitatively verified.As a new cleaning method,supersonic gas-liquid mixed cleaning can efficiently clean various types of impurities such as metal debris,solid dust and grease stains without introducing other types of impurities.The cleaning requirements have the advantages of high cleaning efficiency,green environmental protection,etc.,and can make up for the shortcomings of the existing cleaning methods.In addition,the cleaning method can also be applied to cleaning parts and equipment with structural features of elongated tubes.In general,the supersonic gas-liquid mixed cleaning method has a high use value.