Researsh Of Fuel Atomization Characteristics Of Closing Collision Type Aerospace Engine Nozzle

Nozzle is the terminal parts of the engine the fuel supply system，the merits of the nozzleatomization quality has become a key factor affecting the efficiency of energy use. Therefore,the study of nozzle atomization process has important significance for the optimization ofnozzle. This paper is based on the research of internal combustion engine spray collision, inorder to explore the use of spray impingement to optimize the room air fuel mixing andcombustion process improvement methods and effects of aeroengine combustor, starting fromthe study on the structure and characteristic of spray nozzle. The following research work hasbeen performed:(1) In this thesis, designed of the eleven kinds of nozzles scheme A-I, nine kinds of thesame is the fuel inlet diameter nozzle, and the nozzle hole length transition to the collisionsurface distance. Wherein the nozzle holes A、B、C are three different nozzle diameters,respectively0.2mm、0.3mm、0.4mm. D、E、F representing the difference with A nozzle iscollision angle, respectively75。、85。、105。. While G、F、I three kinds of nozzle comparedwith A collision surface radian different. respectively75。、85。、105。. The two nozzles of J、K and A to the distance of different collision, J nozzles to the colliding surface distance1mm,K from the collision surface to the nozzle is2mm.The remaining parameters and two kinds ofnozzles of the same A nozzle.(2) The atomization characteristics of A nozzle was studied by numerical simulationunder different equivalence ratio conditions. The results show that: with increasingequivalence ratio, SMD decreases and gradually become an extreme value, under the testconditions, when the ratio is0.4, A nozzle atomization best.(3) The numerical simulation of the spray characteristics of different collision schemesshow that: nozzle diameter、impact angle、collision surface arc spraying parameters on thespatial distribution of the collision and atomization characteristics have a greater impact;Nozzle diameter of0.2mm compared with0.3mm and0.4mm more conducive todevelopment and fuel atomization spray collision. With the increase of collision angles, atomization is not always improve, but the existence of an optimum value. Further, with thesame equivalent ratio under SMD collision surface curvature increases, herein impact surfaceangle is0°the best atomization nozzle. When the collision distance is small, smaller holesinjected fuel spray atomization of the first space, Fuel and collision surface contact area issmall, it is not conducive to fuel atomization, atomizing effect better collision distancecollision distance appropriate short, In this paper the collision distance is3mm the bestatomization effect.(4) In order to further analyze the atomization characteristics of nozzles, the Aexperiments were conducted to study the numerical simulation of nozzle, analyzed the flowfield and spray field of A nozzle, A nozzle atomizing chamber and on the lower section offuel atomization particle size distribution are discussed in detail, and has carried on the nozzlestructure optimization.