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TECHNICAL BRIEFS

Efficiency Analysis of Rapid Turbocharger With Alternative Bearing Design

[+] Author and Article Information
Abdelkrim Liazid

 LTE Laboratory, ENSET-Oran, B.O. 1523 El Mnaouer 31000-Oran-Algeriaal_lte@enset-oran.dz

Lahouari Izidi, Mohamed Bencherif

 LTE Laboratory, ENSET-Oran, B.O. 1523 El Mnaouer 31000-Oran-Algeria

J. Mech. Des 128(1), 137-141 (Mar 30, 2005) (5 pages) doi:10.1115/1.2125973 History: Received March 21, 2004; Revised March 30, 2005

This work presents the possibility to adapt self-acting air bearing to a rapid diesel engine turbocharger originally designed with oil journal bearings. The aim of this innovative idea is to estimate a global evolution of efficiency which is a parameter that strongly influences the inlet air mass of the diesel engine. This study deals with radial bearings and illustrates the advantages and the limits of the aerodynamic bearing application. First, the computing concerns the determination of the bearing load by resolving the Reynolds equation. So, the determination of the neat turbine power by a mathematical model using some experimental data is also made. Lastly, a comparison with the original hydrodynamic bearings is presented. Some discussions are also developed.

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Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Evolution of the nondimensional rotor load and the bearing reaction force. Mr=0.260kg; Γ=0.8gmm∕kg.

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Figure 2

Geometrical characteristics of the three skates tilting bearing

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Figure 3

Skate pressure distribution. Case of Ep=0.7; N=1594Hz.

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Figure 4

Bearing load according to the relative eccentricity

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Figure 5

Attitude angle according to the relative eccentricity

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Figure 6

Power lost for each type of radial bearing. Case T=100°C.

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Figure 7

Computed turbine power according to its rotational frequency for various diesel engine regimes

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Figure 8

Turbocharger efficiency profit; T=40°C

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Figure 10

Turbocharger efficiency profit; T=100°C

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Figure 9

Turbocharger efficiency profit; T=80°C

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