ダブルパルスレーザー誘起蛍光法によるディーゼル燃料噴霧のディジタル画像計測 : 第2報 : ディーゼル燃料噴霧の内部構造のPIV計測 : 熱工学, 内燃機関, 動力など

概要

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This paper reports PIV measurement of diesel fuel sprays injected from a single-hole nozzle at high-injection pressure comparable to operating conditions of commercial diesel engines. The injection pressure ranges from 30-70 MPa. The fuel is injected into a non-combusting atmosphere, which is charged up to 2.0 MPa. A laser-induced fluorescent technique is employed to visualize internal structures of fuel sprays formed by densely distributing droplets. A direct cross-correlation PIV technique is applied to the spray images in order to extract droplet velocity information. Unique large-scale structures, called 'branch-like structures', are observed and shown to be associated with active vortical motions of droplets, which appear to be responsible for the mixing between droplets and surrounding gas. Preferential concentration of droplets is found to occur by the centrifugal force exerted by the vortical motions.
2001-01-25