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Research Papers

Effects of Control Valve's Structure Parameters on the Circulation Characteristics for an Electronic Unit Pump

[+] Author and Article Information
Wan-Lin Zhao, Lan Wang, Hong-Meng Li

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

Jie Wang, Shuang-Yi He

China North Engine Research Institute,
Tianjin 300400, China

1Corresponding author.

Manuscript received May 22, 2016; final manuscript received August 18, 2018; published online October 4, 2018. Assoc. Editor: Jeffrey Naber.

J. Eng. Gas Turbines Power 141(2), 021014 (Oct 04, 2018) (10 pages) Paper No: GTP-16-1189; doi: 10.1115/1.4041386 History: Received May 22, 2016; Revised August 18, 2018

The control valve is an essential component of electronic unit pump (EUP) fuel injection systems; it controls the flow rate with high-precision electrical signals. Thus, high precision and flexibility are required in the working process of a fuel injection system. The flow capacity (indicated by mass flow rate) of a control valve is an important technical indicator in the discharge of EUP fuel injection systems. In this study, the transient flow characteristics within control valve during the discharge of an EUP were evaluated using a computational fluid dynamics (CFD) approach. Three essential structural parameters of EUP control valve were investigated, and their effects on circulation characteristics were evaluated. The variation trends were observed, and the changes in significant physical parameters and crucial physical field distributions were analyzed. During the investigation, the visualization of internal flow of control valve provided more detailed information of flow fields. This study shows the effect of each parameter on flow characteristics and indicates that cavitation is the lowest for the case of 0.20 mm valve core lift; the length of slit is the shortest for the case of 7 mm seal diameter, therefore, the mass flow rate of export is the highest; at 139 deg seal cone angles, fuel velocity is the highest, therefore, 139 deg is the best seal cone angle.

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Figures

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Fig. 1

The injection system layout of unit pump and the 3D model of control valve

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Fig. 2

The main structure parameters of flow

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Fig. 3

The grid of section of control valve: (a) The whole grid section, (b) the local grid section, and (c) the grid model of flow domain

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Fig. 4

The validation results of grid independence and convergence: (a) the simulation results of cases with different grid numbers and (b) the high pressure oil pipe outlet pressure calibration curve

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Fig. 5

One-dimensional model of fuel system for electronic control unit pump

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Fig. 6

The outlet mass flow rate and gas phase volume fraction

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Fig. 7

The velocity distribution clouds for cases of different valve core lifts

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Fig. 8

The cavitation distribution clouds of different valve core lifts

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Fig. 9

Velocity curves of cases of different valve core lifts

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Fig. 10

Vapor volume fraction of cases of different valve core lifts

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Fig. 11

Mass flow rate curves of cases of different valve core lifts

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Fig. 12

Comparison of cavitation effect and unloading quantity

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Fig. 13

The velocity distributions clouds for cases of different seal diameters

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Fig. 14

Velocity curves of cases of different seal meters

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Fig. 15

The vapor volume fraction distribution clouds for cases of different seal diameters

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Fig. 16

Vapor volume fraction curves of cases of different seal diameters

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Fig. 17

Mass flow rate curves of cases of different seal diameters

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Fig. 18

Comparison of cavitation effect and unloading quantity

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Fig. 19

The velocity distributions clouds for cases of different seal cone angles

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Fig. 20

Velocity curves of cases of different seal cone angles

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Fig. 21

The vapor volume fraction distribution for cases of different seal cone angles

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Fig. 22

Vapor volume fraction curves of different cases

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Fig. 23

Mass flow rates of cases of different seal cone angles

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Fig. 24

Comparison of cavitation effect and unloading quantity

Tables

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