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Investigations of Solid Particle Erosion on the Flow Channel Walls of a Radial Turbine for Diesel Engine Applications

  • Engine and Emissions, Fuels and Lubricants
  • Published:
International Journal of Automotive Technology Aims and scope Submit manuscript

Abstract

Carbon particles, a primary component of diesel engine emissions, cause persistent erosion in the exhaust piping system, inevitably leading to performance degradation. This erosion can result in reduced fuel economy and increased emissions. The effects of three key parameters including solid particle size, turbine U/C operating conditions and rotational speed on the erosion characteristics of the flow channels of a radial turbine for vehicle diesel engine applications and their impact on performance were investigated through numerical simulations in the study. The findings indicate that larger particle size and higher rotational speed can significantly lead to the higher erosion rate density of the volute channel and casing wall surfaces. Reducing U/C does not substantially affect the distribution of erosion rate density. Centrifugal force will play an important role in the variation of erosion distribution characteristics. Compared to U/C, the other two key parameters are sensitive factors affecting turbine performance degradation. Under the same condition for operating 5000 h, 10 μm particles cause a 7.5-fold increase in efficiency loss change rate compared to 0.5 μm particles. The efficiency loss at 140 krpm is 16 times greater than that at 40 krpm.

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Data availability

The data that support the findings of this study will be available from the corresponding author and the first author, upon reasonable request. Email address: chen_gang@whut.edu.cn (corresponding author); iammach@163.com (first author).

Abbreviations

A :

Cross-sectional area of the volute, mm2

A0 :

Area of the throat of volute flow channel, mm2

b(v) :

Impinging velocity function, –

C :

Isentropic adiabatic expansion velocity of the flow, m/s

C (dp) :

Particle diameter parameter, –

CR_φ i :

The contribution rate of the stage efficiency change for each pneumatic component, –

CR_MFP i :

The contribution rate of the stage MFP change for each pneumatic component, –

f (α) :

Incidence angle function, –

k :

Sand grain size, μm

l :

Number of particles eroding the wall surface per time, –

MFP :

Mass flow parameter (characterizing the similarity of flow), kg K2/(s bar)

m :

Mass flow rate, kg/s

mp :

Mass flow rate of particles, mg/s

n :

Rotational speed, krpm

P :

Diesel Engine power, kW

PS :

Particle sizes, μm

ps:

Pressure side of a blade

R a :

Roughness based on arithmetic mean deviation of contours, μm

r :

Radius of the cross-sectional centroid of the volute, mm

ss:

Suction side of a blade

T :

Erosion time, h

U :

Blade tip velocity, m/s

V :

Particle impinging velocity, m/s

ε m :

Erosion rate density, kg/(m2 s)

ρ face :

Density of the eroded material, kg/m3

φ :

Adiabatic efficiency of the turbine,

face:

Wall surface

local:

Local place

t :

Turbine stage

1 :

Initial state

2 :

Volute channel

3 :

Blade channel

4 :

Rotor casing

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Acknowledgements

The authors thank the Weifang Science and Technology Development Foundation (Grant no. 2021GX011) for its support of this research.

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Authors and Affiliations

  1. School of Mechanical and Automation, Weifang University, Weifang, 261061, China

    Ma Chao

  2. Technical Center, Jiangsu Easyland Automotive Corporation, Wuxi, 214187, China

    Sun Yangli & Wang Quan

  3. School of Naval Architecture Ocean and Energy Power Engineering, Wuhan University of Technology, Wuhan, 430070, China

    Chen Gang

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  1. Ma Chao
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  2. Sun Yangli
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  3. Wang Quan
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  4. Chen Gang
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Correspondence to Chen Gang.

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Chao, M., Yangli, S., Quan, W. et al. Investigations of Solid Particle Erosion on the Flow Channel Walls of a Radial Turbine for Diesel Engine Applications. Int.J Automot. Technol. (2024). https://doi.org/10.1007/s12239-024-00089-5

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