Research Papers

The Sensitivity of Inner Nozzle Flow in Gasoline Direct Injection Injector to the Nozzle Geometry Parameters

[+] Author and Article Information
Xinhai Li, Xue Yang

School of Energy and Power Engineering,
Shandong University,
Jinan 250061, China

Yong Cheng

School of Energy and Power Engineering,
Shandong University,
Jinan 250061, China
e-mail: cysgd@sdu.edu.cn

Xiaoyan Ma

LMT/ENS Cachan/CNRS/Paris-Saclay University,
Cachan 94235, France

1Corresponding author.

Manuscript received June 27, 2018; final manuscript received January 30, 2019; published online February 25, 2019. Assoc. Editor: Jeffrey Naber.

J. Eng. Gas Turbines Power 141(6), 061017 (Feb 25, 2019) (9 pages) Paper No: GTP-18-1383; doi: 10.1115/1.4042729 History: Received June 27, 2018; Revised January 30, 2019

The inner-flow of gasoline direct injection (GDI) injector nozzles plays an important role in the process of spray, and affects the mixture process in gasoline engine cylinder. The nozzle structure also affects the inner-flow of GDI injector. In order to obtain uniform performance of GDI injector, the size consistency of injector nozzle should be ensured. This paper researches the effect of nozzle length and diameter on the inner flow and analyzes the sensitivity of inner flow characteristics to these structural parameters. First, this paper reveals the process of inception, development, and saturated condition of cavitation phenomenon in injector nozzle. Second, the inner-nozzle flow characteristics are more sensitive to small diameter than large diameter under the short nozzle length, while the sensitivity of the inner-nozzle flow characteristics to large nozzle diameter becomes strong as the increase of the nozzle length. Finally, the influence of nozzle angle on the injection mass flow is studied, and the single nozzle fuel mass will increase as the decrease of nozzle angle α. And the sensitivity of inner-flow characteristic to nozzle angle becomes strong as the decrease of α.

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Fig. 1

Injector nozzle model: (a) front view, (b) side cut-plane view, and (c) mesh model

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Fig. 2

Experimental and mesh models: (a) experimental model and (b) mesh model

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Fig. 4

Comparison of experimental and simulation result (pb = 0.3 MPa): (a) test images and (b) simulation result

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Fig. 11

Cut-planes of cavitation under different nozzle lengths

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Fig. 10

The effect of nozzle angle on the nozzle mass flow: (a) injection mass flow and (b) nozzle fuel mass

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Fig. 9

Cut-planes of cavitation and pressure under different nozzle diameters and lengths

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Fig. 8

Sensitivity of nozzle inner flow to the nozzle lengths: (a) effect of the nozzle lengths on LVF of nozzle outlet and (b) sensitivity curves

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Fig. 7

Change in liquid volume-fraction of nozzle outlet with the motion of injector needle

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Fig. 6

Development of cavitation as lift of injector needle

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Fig. 5

Comparison of experimental data and simulation result: (a) grid independency and (b) mass flow comparison



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