Analysis Of The Impact And Freezing Characteristics Of Droplet On Wall Surface

The polar region has many resources and is a key area for countries to compete,and in the future,there will be many ships needing to navigate in the polar region.However,the climate environment of polar geography is very harsh,and navigation in polar regions will encounter very difficult challenges,among which the main challenge is the phenomenon of ship icing.Therefore,the working environment of marine gas turbines also naturally undergoes new changes.The low-temperature sea environment will directly lead to ice accumulation in marine gas turbines,which will affect the safe and stable operation of gas turbines,and this will become one of the key issues affecting the performance of China’s ship power system.However,China’s research on ship ice accumulation started late,and there is a big gap between the research on marine gas turbine ice accumulation mechanism,ice accumulation hazard and anti-icing device design method and international advanced technology.Based on this,this paper mainly carries out the following research contents.(1)In this paper,the correctness of the CLSVOF numerical simulation method for droplet impact is proved by comparison with experiments.Subsequently,the simulation was carried out for droplets with different salinity,impact velocity and diameter hitting the normal temperature surface with different contact angles,and the variation characteristics of droplet spreading coefficient and droplet dimensionless height with dimensionless time under different factors were obtained.The effects of different factors on the collision characteristics of salt-containing droplet impact were obtained.(2)Static droplet icing tests on the low-temperature wall were conducted using a camera and a semiconductor cooler,and the experimental results were compared with those of numerical simulations to verify the correctness of the solidification-melting model.Subsequently,numerical simulations of the phase change solidification process of droplets containing salt concentration on cryogenic walls with different contact angles and temperatures were carried out to analyze the effects of different parameters on the icing characteristics of static droplets on cryogenic walls.(3)The CLSVOF model and the solidification melting model were applied to numerically simulate the salt-containing droplets impacting on the cryogenic wall,and the spreading radius,droplet temperature field,velocity field,pressure field and wall heat flow density were obtained.The effects of wall temperature,impact velocity,droplet size,salt concentration,and wall contact angle on the parameters of droplet impact on the cryogenic wall were investigated,and the effects of different factors on the collision and icing characteristics of droplet impact on the cryogenic wall were analyzed.In this paper,the collision process,static icing process and collisional icing process of salt-containing droplets are studied by using experimental and simulation methods,and the effects of different factors on the collisional characteristics of salt-containing droplets,the effects of different factors on static salt-containing droplet icing and the effects of different factors on the collisional icing process of salt-containing droplets are obtained.