Improvement of Atomization Characteristics of a Micro Nozzle Array Type Gasoline Injector

Araki, Mikiya; Obokata, Tomio; Ishima, Tsuneaki; Shiga, Seiichi; Masubuchi, Masahiko; Sugimoto, Tomojiro

doi:10.4271/2009-28-0041

Cited by 1 publication

(2 citation statements)

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“…Three gasoline injectors and one compressed natural gas (CNG) injector were used for port fuel injection, respectively; (1) low-pressure injectors, 27 (2) high-pressure injectors, (3) the micro nozzle array (MNA) injectors, 28–30 and (4) a CNG injector. These injectors are installed so that they point at the intake valve except for the MNA injector.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

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Effects of injection parameters on the amount of wall-wet fuel in a port-fuel-injected spark-ignition engine during cold start

Araki

Sakairi

Kuribara

et al. 2019

International Journal of Engine Research

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In a four-stroke cycle port-fuel-injected spark-ignition engine, a significant portion of unburned hydrocarbons is exhausted during the short period of cold start. The aim of this study is to investigate the physics behind the wall-wet phenomena and its determining parameter as simply as possible even though qualitative to some extent. The test engine is driven at a constant speed of 350 r/min. The fuel injection starts at a certain cycle, and the cycles required for the first ignition is counted. Three gasoline injectors having different atomization characteristics are used for port fuel injection, and the droplet size, the spray angle and the spray velocity are varied independently. The fuel transport phenomena from the injector to the cylinder are characterized by only two parameters, α and β, the mass fraction of the fuel without wall-wet and the mass fraction of the evaporated fuel from liquid films on walls. They are determined so that all the first ignition cycles observed experimentally are consistently reproduced by the model. The value of α is successfully determined for every single injector, and it increases monotonously with the decrease in the Stokes number.

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Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…The mechanism and the atomization characteristics of the MNA injector can be found in our previous works. 28–30 Table 6 shows the specifications of the MNA injectors. Figure 7 shows a spray image with the definition of the spray angle.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%