Experimental Study And Numerical Simulation On The Performance Of Airborne Spray Cooling

With the improvement of the airborne electronic equipment performance, heat dissipation problem under the high heat flow density environment is particularly prominent. For airborne laser weapons, on the basis of the fast cooling, the uniformity of heat transfer surface temperature should also be considered. As a new type of high efficiency heat transfer technology, spray cooling has the advantages of low thermal resistance, small heat transfer temperature difference, uniform surface temperature and small demand of working medium, it is one of the most promising cooling way under the airborne high heat flow density environments. In this paper, in order to study the cooling problem of airborne laser weapon and high power electronic equipment, the spray cooling experiment system with high heat flux is designed and constructed, the heat transfer performance is analyzed through experimental and numerical methods, and the main content includes:(1) The spray cooling experimental system is constructed, and the major influencing factors of spray cooling heat transfer characteristics like the spray height, spray flow rate, surface structures and the additives are studied respectively, the influence law of the factors above to heat transfer performance is analyzed. The researches above have a certain guiding significance for spray cooling technology applied in the airborne electronic equipment heat dissipation.(2) Based on single nozzle experiment condition, the influencing factors of spray flow characteristics like spray height, spray flow rate and gravity acceleration are studied respectively by the method of numerical simulation. The rules of droplet size, liquid film formation rate, liquid film height and flow velocity under different working conditions are obtained. The researches above indicate the optimization direction for the further improvement of spray flow characteristics.(3) Through numerical simulation method to compare the single nozzle and double nozzles of the spray flow characteristics, calculation results show that using double nozzle, spray droplet size is small, the liquid film height and flow velocity distribution uniformity, the nozzle spacing on the influence of the liquid film flow characteristics is also analyzed. The researches above provide guidance for the double nozzle experiment.