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172414

Effect of the Injector Viscous Damping on the Mass of Fuel injected During the Delay Period in Diesel Engines.

Article

Last updated: 04 Jan 2025

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Subjects

-

Tags

Mechanical Power Engineering

Abstract

 The two major problems of automotive diesel engines, namely the combustion noise and high NO emissions can be reduced and become less serious by reducing the fuel mass injected during the delay period. The injector of the diesel fuel injection system is provided with a suitable viscous damping unit to increase the viscous fri9ction force which resist the needle lift. In this paper, a general outline of the viscous damping unit is introduced and the considered fuel injection system is simulated numerically. The pressure in the different parts of the injection system is predicted using the theory of wave action where the finite difference principle has been incorporated. The needle valve motion is represented by the equation of motion and the rate of fuel injected is predicted using the theory OE the two Orifices in series. The influence of the viscous dancing on the injection process has been theoretically examined and the reduction percentage of the fuel mass injected during the delay period has been estimated for different values of damping coefficient.
An experimental study for the verification of the predicted results has been carried out. A satisfactory agreement between the predicted and the experimentally recorded results of pressure in the Injection system has been observed. It is found that, providing an extra viscous damping to the injector of the injection system, keeps the rate of the fuel Injected low at the start of the injection Process, then the injection rate rises fast subsequently. As a result, a good reduction of the amount of the fuel injected during the expected delay period is obtained.

DOI

10.21608/bfemu.2021.172414

Authors

First Name

M.

Last Name

El-Kady

MiddleName

-

Affiliation

Mechanical Power Department., Faculty of Engineering., El-Mansoura University., El-Mansoura., Egypt.

Email

mselkady@mum.mans.eun.eg

City

Mansoura

Orcid

-

First Name

Salah

Last Name

El-Emam

MiddleName

Hassan Youssef

Affiliation

Associate Professor., Mechanical Power Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.

Email

sh_elemam@mans.edu.eg

City

Mansoura

Orcid

-

Volume

14

Article Issue

2

Related Issue

24981

Issue Date

1989-12-01

Receive Date

1989-10-10

Publish Date

2021-05-26

Page Start

85

Page End

102

Print ISSN

1110-0923

Online ISSN

2735-4202

Article File

BFEMU_Volume 14_Issue 2_Pages 85-102.pdf

PDF . 1.5MB

Link

https://bfemu.journals.ekb.eg/article_172414.html

Detail API

https://bfemu.journals.ekb.eg/service?article_code=172414

Order

17

Type

Research Studies

Type Code

1,205

Publication Type

Journal

Publication Title

MEJ. Mansoura Engineering Journal

Publication Link

https://bfemu.journals.ekb.eg/

MainTitle

Effect of the Injector Viscous Damping on the Mass of Fuel injected During the Delay Period in Diesel Engines.

Details

Type

Article

Created At

22 Jan 2023