Numerical simulation of heavy fuel oil atomization using a pulsed pressure-swirl injector  

作　　者：S.M.A.Najafi P.Mikaniki H.Ghassemi 

机构地区：[1]School of Mechanical Engineering,Iran University of Science and Technology,P.O.B.16765-163,Tehran,Iran

出　　处：《Chinese Journal of Chemical Engineering》2021年第4期61-69,共9页中国化学工程学报（英文版）

摘　　要：It is known that increasing the injection pressure reduces the breakup length and the droplet size.Adding pulses,on the other hand,helps to atomize the liquid into finer droplets,similar to airassisted injectors but without altering the airtofuel concentration.To further reduce the droplet size and breakup length,a novel injector type,called''Pulsed PressureSwirl"(PPS),is introduced in this work,which is a combination of pressureswirl and ultrasonic pulsed injectors.A pressureswirl atomizer was designed and fabricated specifically for Mazut HFO(Heavy Fuel Oil).The droplet formation process and droplet size distribution have been studied experimentally(by shadowgraphy high speed imaging)and numerically(with the opensource VolumeofFluid code Gerris).Changing liquid injection pressure effect on the spray angle and film thickness has been quantified.These simulations have been used to study the primary breakup process and quantify the droplet size distributions,using different injection pulse frequencies and pressures.The numerical results have revealed that the new injector concept successfully produces finer droplets and results in a decrease in the breakup length,especially when applying high pulse frequencies,with no significant changes in the spray angle.

关 键 词：SPRAY Heavy fuel oil Mazut ATOMIZATION Pulsed Pressure-Swirl INJECTOR 

分 类 号：TK16[动力工程及工程热物理—热能工程]