Numerical Simulation Analysis of Fluid Erosion Corrosion of Injection Nozzle for Diesel Engine

doi:10.11902/1005.4537.2013.222

Journal of Chinese Society for Corrosion and protection

2014, Vol. 34

Issue (6): 574-580 DOI: 10.11902/1005.4537.2013.222

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Numerical Simulation Analysis of Fluid Erosion Corrosion of Injection Nozzle for Diesel Engine

ZHOU Tingting^1,², YUAN Chengqing^1,²(

), CAO Pan^1,², WANG Xuejun^1,², DONG Conglin^1,²

1. Reliability Engineering Institute, School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China
2. Key Laboratory of Marine Power Engineering & Technology, Ministry of Transport, Wuhan University of Technology, Wuhan 430063, China

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Abstract

According to the basic principle of fluid flow, mathematical models of erosion corrosion and cavitations flow phase transition are established, the internal fluid flow of the nozzle is numerically simulated and analyzed by Fluent software. The results show that the serious damage position of material caused by the erosion locates on the corner of nozzle inlet. However, the position suffered from the maximum shear stress will be near to the nozzle exit when the "super cavitation" phenomenon exists. For a given level of corrosivity of fuel used, the erosion degree increases with the increase of the viscosity, fluid velocity and inlet pressure of the fuel, as well as the corner radius of the nozzle inlet, and decreases with the increase of the back pressure. For a given inlet pressure and a flow rate, the erosion corrosion would be reduced and the fuel atomization would be facilitated when the viscosity and back pressure of the fuel as well as the corner radius of the nozzle inlet were reduced.

Key words: nozzle erosion corrosion cavitation shear stress numerical simulation

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Cite this article:

ZHOU Tingting, YUAN Chengqing, CAO Pan, WANG Xuejun, DONG Conglin. Numerical Simulation Analysis of Fluid Erosion Corrosion of Injection Nozzle for Diesel Engine. Journal of Chinese Society for Corrosion and protection, 2014, 34(6): 574-580.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2013.222 OR https://www.jcscp.org/EN/Y2014/V34/I6/574

Fig.1 Two microtubes model

Fig.2 Nozzle grid model

Fig.3 Field calculation results for cavitation flow in axisymmetric single-hole nozzle hole: (a) pressure field, (b) contours of volume fraction, (c) wall shear stress

Fig.4 Cavitation flow under different viscosity: (a) ν=12 mm²/s, (b) ν=16 mm²/s, (c) ν=20 mm²/s

Fig.5 Maximum shear stress for fuels with different viscosities

Fig.6 Minimum shear stress for fuels with different viscosities

Fig.7 Cavitation flow distributions under different inlet pressures between heavy diesel (a~c) and diesel (d~f): (a, d) P₁=8 MPa, (b, e) P₁=10 MPa, (c, f) P₁=12 MPa

Fig.8 Maximum shear stress under different inlet pressure between heavy diesel and diesel

Fig.9 Cavitation flow distributions under different back pressures between heavy diesel and diesel : (a) P_b=1MPa, (b) P_b=2MPa, (c) P_b=3MPa

Fig.10 Maximum shear stress under different back pressures between heavy diesel and diesel

Fig.11 Wall shear stress in the different position of nozzle hole

Fig.12 Cavitation flow distributions under different corner radius of the nozzle inlet: (a) R=0 µm, (b) R=20 µm, (c) R=40 µm

Fig.13 Maximum shear stress under different corner radius of the nozzle inlet

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