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Dynamic structure of direct-injection gasoline engine sprays: air flow and density effects

Dynamic structure of direct-injection gasoline engine sprays: air flow and density effects
Dynamic structure of direct-injection gasoline engine sprays: air flow and density effects
The characteristics of the hollow-cane fuel spray produced by a centrally- located pressure-swirl atomizer have been investigated in a constant-volume pressure chamber and in a motored single-cylinder direct-injection spark-ignition (DISI) research engine. The aim is to describe the effect of elevated chamber pressure and in-cylinder bulk air motion on the spray development process. In addition to ambient conditions, chamber pressures of 5 and 7 bar absolute, corresponding to air densities of 5.82 and 8.14kg/m3, respectively, at atmospheric temperature (300 ?), were investigated as these conditions are representative of the range of in-cylinder pressure and densities corresponding to "early" through 'late" injection strategies. Spray dynamics in a constant-volume chamber, under near-quiescent flow conditions, are shown to be representative of in-cylinder sprays and therefore provide appropriate means for evaluating the relative effect of the intake air flow and in-cylinder density on the fuel spray development process. A wide range of operating conditions of a four-valve DISI engine with a centrally located pressure-swirl atomizer were examined at engine speeds of 700 and 1500 rpm and for four start-of-injection (SOI) timings of 90', 180', 270', and 300' after top-dead-center (aTDC) of intake. The results revealed that fuel spray impingement on the flat piston occurred only with injection at 300' ATDC, and that larger droplets are produced by pressure-swirl atomizers operating at higher gas pressures which suggests that achieving consistent late injection strategies for low-load operation with spray-guided systems using such injector designs may be an insurmountable problem.
1045-5110
539-557
Kashdan, Julian T.
151a1a96-2bf2-406f-92fa-3840b7edc9f0
Shrimpton, John S.
9cf82d2e-2f00-4ddf-bd19-9aff443784af
Arcoumanis, C.
3894e334-c462-4ebb-ae58-bd191e681ff9
Kashdan, Julian T.
151a1a96-2bf2-406f-92fa-3840b7edc9f0
Shrimpton, John S.
9cf82d2e-2f00-4ddf-bd19-9aff443784af
Arcoumanis, C.
3894e334-c462-4ebb-ae58-bd191e681ff9

Kashdan, Julian T., Shrimpton, John S. and Arcoumanis, C. (2002) Dynamic structure of direct-injection gasoline engine sprays: air flow and density effects. Atomization and Sprays, 12 (4), 539-557. (doi:10.1615/AtomizSpr.v12.i4.100).

Record type: Article

Abstract

The characteristics of the hollow-cane fuel spray produced by a centrally- located pressure-swirl atomizer have been investigated in a constant-volume pressure chamber and in a motored single-cylinder direct-injection spark-ignition (DISI) research engine. The aim is to describe the effect of elevated chamber pressure and in-cylinder bulk air motion on the spray development process. In addition to ambient conditions, chamber pressures of 5 and 7 bar absolute, corresponding to air densities of 5.82 and 8.14kg/m3, respectively, at atmospheric temperature (300 ?), were investigated as these conditions are representative of the range of in-cylinder pressure and densities corresponding to "early" through 'late" injection strategies. Spray dynamics in a constant-volume chamber, under near-quiescent flow conditions, are shown to be representative of in-cylinder sprays and therefore provide appropriate means for evaluating the relative effect of the intake air flow and in-cylinder density on the fuel spray development process. A wide range of operating conditions of a four-valve DISI engine with a centrally located pressure-swirl atomizer were examined at engine speeds of 700 and 1500 rpm and for four start-of-injection (SOI) timings of 90', 180', 270', and 300' after top-dead-center (aTDC) of intake. The results revealed that fuel spray impingement on the flat piston occurred only with injection at 300' ATDC, and that larger droplets are produced by pressure-swirl atomizers operating at higher gas pressures which suggests that achieving consistent late injection strategies for low-load operation with spray-guided systems using such injector designs may be an insurmountable problem.

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Published date: 2002

Identifiers

Local EPrints ID: 64544
URI: http://eprints.soton.ac.uk/id/eprint/64544
ISSN: 1045-5110
PURE UUID: e8204f7b-a623-4491-8d31-887595a57c87

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Date deposited: 08 Jan 2009
Last modified: 15 Mar 2024 11:50

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Author: Julian T. Kashdan
Author: C. Arcoumanis

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