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Research Papers: Internal Combustion Engines

The Investigation of Geometric Parameters on the Injection Characteristic of the High Pressure Common-Rail Injector

[+] Author and Article Information
Ling Wang

School of Mechanical,
Electronic and Control Engineering,
Beijing Jiaotong University,
Beijing 100044, China

Guo-Xiu Li

School of Mechanical,
Electronic and Control Engineering,
Beijing Jiaotong University,
Beijing 100044, China
e-mail: Li_guoxiu@yahoo.com

Chun-Long Xu, Xing Xi, Xiao-Jun Wu, Shu-Ping Sun

China North Engine Research Institute,
Tianjin 300400, China

1Corresponding author.

Contributed by the IC Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received April 14, 2016; final manuscript received June 29, 2018; published online October 31, 2018. Assoc. Editor: Jeffrey Naber.

J. Eng. Gas Turbines Power 141(2), 022801 (Oct 31, 2018) (12 pages) Paper No: GTP-16-1138; doi: 10.1115/1.4041134 History: Received April 14, 2016; Revised June 29, 2018

According the actual structure and working principle of a fuel injector to build a model of the common-rail injector, including the control valve, the solenoid valve, and the needle valve of the injector. The model includes the leakage model for the control piston and needle valve that takes into account increasing leakage at high pressure. The performance of the fuel injector is investigated using a one-dimensional numerical model. Analyzing the effect of the system and structure parameters including common-rail pressure, injection pulse width, inlet and outlet hole diameter, and the injection nozzle on the injection characteristics of the fuel injector. Results show that the geometric parameter is the main property affecting the flow characteristic of the injector, which includes the flow rate of inlet and outlet hole, pressure waves in the control chamber and injection rate. The common-rail pressure, injection pulse width and the geometric parameters mainly affect the injection performance, such as the injection rate and injected volume. The investigation result can provide some useful information to improve the injection characteristic in follow-up studies.

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References

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Yan, H. U. , Guo-xiu, L. I. , Fang-di, L. U. , and Guo-xi, G. , 2011, “ Simulation of the Influence of Key Structural Parameters of High-Pressure Common Rail Injector on the Ejecting Performance,” Railw. Locomot. Cars, 31(S1), pp. 128–132.
Jin, H.-Y. , and Lian-dong, F. U. , 2012, “ High Pressure Common Rail Injector Simulation Analysis for Diesel Engine,” Small Intern. Combust. Engine Motorcycle, 41(5).
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Payri, R. , Salvador, F. J. , Martí-Aldaraví, P. , and Martínez-López, J. , 2012, “ Using One-Dimensional Modeling to Analyse the Influence of the Use of Biodiesels on the Dynamic Behavior of Solenoid-Operated Injectors in Common Rail Systems: Detailed Injection System Model,” Energy Convers. Manage., 54(1), pp. 90–99. [CrossRef]
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Fu-kang, M. A. , and Xiao-jun, W. U. , 2012, “ Simulating Calculation of Structural Parameter of High Pressure Common Rail Injector,” Mod. Veh. Power, 1.
Wen-yan, X. U. , Xiao-jun, W. U. , and Wang, J.-X. , 2011, “ Simulation Analysis of Main Structural Parameters of High-Pressure Common-Rail Oil-Injector,” Intern. Combust. Engines, 2, pp. 11–14.

Figures

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Fig. 1

One-dimensional model of the high pressure common-rail injector

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Fig. 2

The comparison between the experimental injected volume and the results of the injector simulation for nine different common-rail pressures

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Fig. 3

Inlet flow rate versus time for different pressures

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Fig. 4

Outlet flow rate versus time for different pressures

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Fig. 5

Pressure waves versus time for different pressures

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Fig. 6

Needle lift versus time for different pressures

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Fig. 7

Injection rate versus time for different pressures

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Fig. 8

Injected volume versus time for different pressures

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Fig. 9

The maximum inlet flow rate as a function of pressure

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Fig. 10

The maximum outlet flow rate as a function of pressure

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Fig. 11

Time versus common-rail pressures. (t1) needle begins to open; (t2) needle opened fully; (t3) needle begins to close; (t4) needle closed fully.

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Fig. 12

The maximum injection rate versus different common-rail pressures

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Fig. 13

The injected volume versus different common-rail pressures

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Fig. 14

Inlet flow rate versus time for different pulse widths

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Fig. 15

Outlet flow rate versus time for different pulse widths

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Fig. 16

Pressure waves versus time for different pulse widths

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Fig. 17

Needle valve lift versus time for different pulse widths

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Fig. 18

Injection rate versus time for different pulse widths

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Fig. 19

Injected volume versus time for different pulse widths

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Fig. 20

The maximum inlet flow rate versus different pulse widths

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Fig. 21

The maximum outlet flow rate versus different pulse widths

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Fig. 22

Time versus pulse widths. (t1) needle begins to open; (t2) needle valve opened fully; (t3) needle begins to close; (t4) needle has closed fully.

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Fig. 23

The maximum of injection rate versus different pulse widths

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Fig. 24

The injected volume versus different pulse widths

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Fig. 25

Inlet flow rate versus time for different inlet hole diameters

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Fig. 26

Outlet flow rate versus time for different inlet hole diameters

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Fig. 27

Pressure waves versus time for different inlet hole diameters

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Fig. 28

Needle lift versus time for different inlet hole diameters

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Fig. 29

Injection rate versus time for different inlet hole diameters

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Fig. 30

Injected volume versus time for different inlet hole diameters

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Fig. 31

The maximum inlet flow rate as a function of the inlet hole diameter

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Fig. 32

The maximum outlet flow rate as a function of the inlet hole diameter

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Fig. 33

Time versus inlet hole diameter. (t1) needle begins to open; (t2) needle has fully opened; (t3) needle begins to close; (t4) the needle has fully closed.

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Fig. 34

The maximum injection rate versus different inlet hole diameters

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Fig. 35

The injected volume versus different inlet hole diameters

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Fig. 36

Inlet flow rate versus time for different outlet hole diameter

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Fig. 37

Outlet flow rate versus time for different outlet hole diameters

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Fig. 38

Pressure waves versus time for different outlet hole diameters

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Fig. 39

Needle lift versus time for different outlet hole diameters

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Fig. 40

Injection rate versus time for different outlet hole diameters

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Fig. 41

Injected volume versus time for different outlet hole diameters

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Fig. 42

The maximum inlet flow rate as a function of the outlet hole diameter

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Fig. 43

The maximum outlet flow rate as a function of the outlet hole diameter

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Fig. 44

Time versus the outlet hole diameter. (t1) needle begins to open; (t2) needle opened fully; (t3) needle begins to close; (t4) needle closed fully.

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Fig. 45

The maximum injection rate versus different outlet hole diameters

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Fig. 46

The injected volume versus different outlet hole diameters

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Fig. 47

Inlet flow rate versus time for different nozzle hole diameters

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Fig. 48

Outlet flow rate versus time for different nozzle hole diameters

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Fig. 49

Pressure waves versus time for different nozzle hole diameters

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Fig. 50

Needle lift versus time for different nozzle hole diameters

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Fig. 51

Injection rate versus time for different nozzle hole diameters

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Fig. 52

Injected volume versus time for different nozzle hole diameters

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Fig. 53

The maximum inlet flow rate as a function of the nozzle hole diameter

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Fig. 54

The maximum outlet flow rate as a function of the nozzle hole diameter

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Fig. 55

Time as a function of the nozzle hole diameter. (t1) needle begins to open; (t2) needle opened fully; (t3) needle begins to close; (t4) needle closed fully.

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Fig. 56

The maximum injection rate versus different nozzle hole diameters

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Fig. 57

The injected volume versus different nozzle hole diameters

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