Modeling of pressure line behavior of a common rail diesel engine due to injection and fuel variation

  • Mostafa Mohebbi
  • Azhar Abdul Aziz
  • Arman Hamidi
  • Alireza Hajialimohammadi
  • Vahid Hosseini
Technical Paper
  • 228 Downloads

Abstract

Common rail diesel engines with electronic fuel injection can accurately meter the fuel injection quantity with more accurate fuel injection control capability. In this work a common rail fuel injection system of a single cylinder diesel engine has been proposed and the important parameters like injection pressure, energizing time and high pressure pipes diameter and length are designed such that to be compatible with the engine basic design in case of pressure waves and injected mass variations. A one-dimensional approach has been used to model the injector using AMESim code in which Adiabatic models have been used to model injector system. Injected mass quantity has been calculated for different working point of fuel injection system that can be utilized as engine electronic control maps as inlet parameters. Results indicated that pressure fluctuation at the injector inlet is increased by decreasing pipe diameter while tube length has no significant effect on pressure waves. It is also shows that using biodiesel as fuel will lead to decrease in injection quantity but there is no significant impact on pressure fluctuations.

Keywords

Common rail injector Pressure frequency Injection rate AMESim 

List of symbols

A0

Area of nozzle hole (mm3)

Cd

Discharge coefficient

CN

Cavitation number

CR

Common-rail

d

Spring spire diameter (mm)

D

Spring diameter (mm)

D0

Diameter at the orifice outlet (mm)

ET

Energizing time (ms)

EDC

Electronic desel control

HPCR

High pressure Common-rail

IQA

Injection Quantity Adjustment

k

Stiffness of spring (N/m)

L

Length

\(\dot{m}_f\)

Mass flow rate (kg/s)

na

Spring number of spires

Pb

Discharge pressure (bar)

Pi

Injection pressure (bar)

Pv

Vapor pressure of fuel (bar)

PWC

Pressure wave correction

RME

Rape seed methyl ester

u

Velocity (m/s)

λ

Flow number

vf

Fuel kinematic viscosity (cSt)

ρf

Fuel density (kg/m3)

ΔP

Pressure drop (bar)

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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2016

Authors and Affiliations

  • Mostafa Mohebbi
    • 1
  • Azhar Abdul Aziz
    • 1
  • Arman Hamidi
    • 2
  • Alireza Hajialimohammadi
    • 3
  • Vahid Hosseini
    • 4
  1. 1.Automotive Development Center (ADC), Faculty of Mechanical EngineeringUniversiti Teknologi Malaysia (UTM)Johor BahruMalaysia
  2. 2.Mechanical Engineering FacultyAmirkabir University of TechnologyTehranIran
  3. 3.Mechanical Engineering FacultySemnan UniversitySemnanIran
  4. 4.Mechanical Engineering FacultySharif University of TechnologyTehranIran

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