The Journal of Engine Research

The Journal of Engine Research

Numerical investigation the effect of accumulator on reducing the pressure waves in a common rail fuel injection system of diesel engine

Document Type : Original Article

Authors
Rasoul Hematian 1, 2
Seyed Reza Hassan-Beygi 3
Jafar Massah 4
Alireza Hajialimohammadi 5
1 PhD in Mechanic of Biosystem Engineering, College of Abouraihan, University of Tehran, Tehran, Iran
2 Chief Designer, Irankhodro Powertrain Company (IPCO), Tehran, Iran
3 Professor, Department of Agro-Technology, College of Abouraihan, University of Tehran, Tehran, Iran
4 Professor, Department of Agro-Technology, College of Abouraihan, University of Tehran, , Tehran, Iran
5 Assistant Professor, Mechanical Engineering Department, Semnan University, Semnan, Iran
10.22034/er.2022.701023
Abstract
Pressure fluctuations during fuel injection are one of the factors that negative effect on performance of diesel engine. These fluctuations are caused by the rapid opening and closing of the nozzles and the creation of pressure waves in the fuel rail. One way to control these pressure fluctuations is to change the injector design and use an accumulator in the injector. This study is performed to investigate the effect of adding accumulator on the injector to control pressure waves in the common rail fuel injection system of diesel engines. As the simulation results show, at injection pressure of 1000 bar and energizing time of 0.8 milliseconds, in the case of no accumulator, the maximum pressure fluctuation in the fuel rail is 1046 bar and the minimum pressure is 891 bar. By adding an accumulator with a volume of 4 cm3, the maximum pressure continued to decrease and reached 1023 bar, and the minimum pressure of the fuel rail increased by 17 bar, 943 bar. These changes are also noticeable in other pressures and energizing times, so the best accumulator that has the most impact on reducing pressure fluctuations is the accumulator with a volume of 4 cm3.
Keywords
Accumulator
Common rail
Diesel engine
Fuel pressure
Pressure fluctuations
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The Journal of Engine Research
Volume 68, Issue 68
Autumn 2022
Pages 31-38

  • Receive Date 04 February 2022
  • Revise Date 19 May 2022
  • Accept Date 19 May 2022