Investigation On Heat Transfer Enhancement Of Deicing Fluid

With the rapid development of China's civil aviation industry, the whole industry pay more attention to aircraft operating efficiency and flight punctuality rate on the basis of the safe operation. For the airport with ice and snow conditions in the winter, how to realize the fast operation of the aircraft deicing work is important to ensure the efficient operation of the aircraft. Consideration from the heating of the deicing fluid, in this paper, the FLUNT software is used to simulate and study the process of heat transfer enhancement of high viscosity deicing fluid, which supports for fast deicing work.Firstly, based on the field coordination principle, the structure optimization of the original deicing fluid heating system is carried out: adding grooves on the helical coil tube. In the SolidWorks software environment, model the helical coil and three kinds of helical coil tube with grooves. Use computational fluid dynamics grid partitioning software ICEM to generate mesh for four kinds of helical coils.Secondly, select the realizable k-? model, try different speed inlet conditions,numerical simulation of water heat transfer process of four kinds of helical coils is carried out by FLUENT. The results show that the heat transfer process of the helical coil is enhanced,which can not only improve the water temperature at the outlet of the tube, but also enhance the uniformity of the temperature of the outlet.Finally, according to the actual situation, use the main components of the ice liquid(ethylene glycol) as fluid engineering, using Origin function to fit the curve of the temperature changed with ethylene glycol viscosity, viscosity fitting formula with good accuracy is obtained. According to the fitting formula, the UDF function of FLUENT is written, and the viscosity of ethylene glycol is modified, the numerical simulation is carried out in FLUENT. The results show that for high viscosity fluid ethylene glycol, the heat transfer process is enhanced by the helical coil with the grooves, so that the temperature of the tube is improved; At the same time, because of the high viscosity of ethylene glycol, in the initial stage of the heating process, the temperature will not increase obviously like water, the outlet temperature is much less than the outlet temperature of the water as the working fluidunder the same condition. In addition, for ethylene glycol, the change of inlet velocity has a great influence on the temperature of the outlet.This study can provide reference for the optimization design of the heating system for deicing liquid, and it also can improve the deicing efficiency of the aircraft at the present time.