Effect of flash boiling on microscopic and macroscopic spray characteristics in optical GDI engine

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Effect of flash boiling on microscopic and macroscopic spray characteristics in optical GDI engine. / Guo, Hengjie; Ma, Xiao; Li, Yanfei; Liang, Shuai; Wang, Zhi; Xu, Hongming; Wang, Jianxin.

In: Fuel, Vol. 190, 15.02.2017, p. 79-89.

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Guo, Hengjie ; Ma, Xiao ; Li, Yanfei ; Liang, Shuai ; Wang, Zhi ; Xu, Hongming ; Wang, Jianxin. / Effect of flash boiling on microscopic and macroscopic spray characteristics in optical GDI engine. In: Fuel. 2017 ; Vol. 190. pp. 79-89.

Bibtex

@article{53ee1ea4d39940b4b18f3021555b9376,
title = "Effect of flash boiling on microscopic and macroscopic spray characteristics in optical GDI engine",
abstract = "The flash boiling sprays in a single-cylinder optical gasoline direct injection (GDI) engine were studied using phase Doppler particle analyzer (PDPA) and high-speed photography. Initially, the factors which may influence the in-cylinder measurement reliability of PDPA were carefully examined under atmospheric conditions. Afterwards, engine experiments were conducted under idle and wide open throttle (WOT) conditions with the fuel temperature ranging from 20 ??C to 90 ??C. The results show that under idle operation, the spray collapsed towards the injector axis as the fuel temperature increased. At high fuel temperatures, the spray penetration increased so that the probability of fuel-wall impingement rises. As the fuel temperature increased from 20 ??C to 60 ??C, the AMD and SMD slumped by 43.6% and 33.2%, indicating the dramatic improvement in atomization quality. Concurrently, the droplet uniformity decreased sharply. As the temperature further increased to 90 ??C, the AMD and SMD only dropped slightly, but the droplet uniformity became better. Under WOT operation, no distinct evidence of spray deformation was found except for the case at 90 ??C. The AMD and SMD dropped steadily with the increase in fuel temperature, which is mainly attributed to the reduction in viscosity and surface tension. Besides, the droplet uniformity increased gradually along with the fuel temperature.",
keywords = "Atomization, Flash boiling, Gasoline direct injection, Optical engine, PDPA",
author = "Hengjie Guo and Xiao Ma and Yanfei Li and Shuai Liang and Zhi Wang and Hongming Xu and Jianxin Wang",
year = "2017",
month = feb,
day = "15",
doi = "10.1016/j.fuel.2016.11.043",
language = "English",
volume = "190",
pages = "79--89",
journal = "Fuel",
issn = "0016-2361",
publisher = "Elsevier Korea",

}

RIS

TY - JOUR

T1 - Effect of flash boiling on microscopic and macroscopic spray characteristics in optical GDI engine

AU - Guo, Hengjie

AU - Ma, Xiao

AU - Li, Yanfei

AU - Liang, Shuai

AU - Wang, Zhi

AU - Xu, Hongming

AU - Wang, Jianxin

PY - 2017/2/15

Y1 - 2017/2/15

N2 - The flash boiling sprays in a single-cylinder optical gasoline direct injection (GDI) engine were studied using phase Doppler particle analyzer (PDPA) and high-speed photography. Initially, the factors which may influence the in-cylinder measurement reliability of PDPA were carefully examined under atmospheric conditions. Afterwards, engine experiments were conducted under idle and wide open throttle (WOT) conditions with the fuel temperature ranging from 20 ??C to 90 ??C. The results show that under idle operation, the spray collapsed towards the injector axis as the fuel temperature increased. At high fuel temperatures, the spray penetration increased so that the probability of fuel-wall impingement rises. As the fuel temperature increased from 20 ??C to 60 ??C, the AMD and SMD slumped by 43.6% and 33.2%, indicating the dramatic improvement in atomization quality. Concurrently, the droplet uniformity decreased sharply. As the temperature further increased to 90 ??C, the AMD and SMD only dropped slightly, but the droplet uniformity became better. Under WOT operation, no distinct evidence of spray deformation was found except for the case at 90 ??C. The AMD and SMD dropped steadily with the increase in fuel temperature, which is mainly attributed to the reduction in viscosity and surface tension. Besides, the droplet uniformity increased gradually along with the fuel temperature.

AB - The flash boiling sprays in a single-cylinder optical gasoline direct injection (GDI) engine were studied using phase Doppler particle analyzer (PDPA) and high-speed photography. Initially, the factors which may influence the in-cylinder measurement reliability of PDPA were carefully examined under atmospheric conditions. Afterwards, engine experiments were conducted under idle and wide open throttle (WOT) conditions with the fuel temperature ranging from 20 ??C to 90 ??C. The results show that under idle operation, the spray collapsed towards the injector axis as the fuel temperature increased. At high fuel temperatures, the spray penetration increased so that the probability of fuel-wall impingement rises. As the fuel temperature increased from 20 ??C to 60 ??C, the AMD and SMD slumped by 43.6% and 33.2%, indicating the dramatic improvement in atomization quality. Concurrently, the droplet uniformity decreased sharply. As the temperature further increased to 90 ??C, the AMD and SMD only dropped slightly, but the droplet uniformity became better. Under WOT operation, no distinct evidence of spray deformation was found except for the case at 90 ??C. The AMD and SMD dropped steadily with the increase in fuel temperature, which is mainly attributed to the reduction in viscosity and surface tension. Besides, the droplet uniformity increased gradually along with the fuel temperature.

KW - Atomization

KW - Flash boiling

KW - Gasoline direct injection

KW - Optical engine

KW - PDPA

U2 - 10.1016/j.fuel.2016.11.043

DO - 10.1016/j.fuel.2016.11.043

M3 - Article

VL - 190

SP - 79

EP - 89

JO - Fuel

JF - Fuel

SN - 0016-2361

ER -