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Flows in Complex Systems

An Investigation on Turbocharger Turbine Performance Parameters Under Inlet Pulsating Flow

[+] Author and Article Information
Tabatabaei Hamidreza1

Department of Mechanic and Aerospace Engineering,  Science and Research Branch, Islamic Azad University, P.O. Box 14155-4933, Hesarak, Tehran, Iranh.tabatabaei@iaukashan.ac.ir

Boroomand Masoud

Department of Aerospace Engineering,  Amirkabir University of Technology, Hafez Avenue, P.O. Box 15875-4413, Tehran, Iranboromand@aut.ac.ir

Taeibi Rahni Mohammad

Department of Aerospace Engineering,  Sharif University of Technology, Azadi Avenue, P.O. Box 11365-11155, Tehran, Irantaeibi@sharif.ac.ir

1

Corresponding author.

J. Fluids Eng 134(8), 081102 (Jul 27, 2012) (8 pages) doi:10.1115/1.4006995 History: Received October 19, 2011; Revised June 04, 2012; Published July 27, 2012; Online July 27, 2012

Three-dimensional steady and unsteady (pulsating) compressible flows in a vane-less turbocharger turbine of a 1.7 liter SI engine are simulated numerically, and the results are validated experimentally using a turbocharged on-engine test cell. Simulations are carried out for a 720° engine cycle at three engine speeds, and the complete forms of volute and rotor vanes are modeled. Two ways for modeling the rotating wheel, multiple reference frames (MRF), and sliding mesh (SM) techniques are also examined. Finally, the effects of pulsating flow on the turbocharger turbine performance parameters (TTPP) such as the inlet static pressure, reduced mass flow rate, and efficiency are obtained and compared with their values under steady flow. The results show that the accuracy of steady characteristic map to estimate the TTPPs has some source of ambiguity, which should be considered for detailed analysis. TTPP values under steady flow conditions are found to be significantly deviated from the unsteady results. These deviations are decreased as the engine speed increases.

Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Three-dimensional modeling of the turbine

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Figure 2

Tetrahedral meshes on the turbine casing and blades

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Figure 3

Schematic diagram of 1D simulation

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Figure 4

Schematic diagram of the test cell configuration

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Figure 6

Grid study by controlling mass flow rate

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Figure 7

The turbine inlet temperatures versus crank angle

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Figure 8

The turbine inlet mass flow rates versus crank angle

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Figure 9

The turbine outlet static pressures versus crank angle

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Figure 10

Comparison of experimental instantaneous pressures ratios of the turbine with those of 3D unsteady flow simulation versus crank angle

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Figure 11

Comparison of experimental instantaneous inlet pressures of the turbine with those of 3D unsteady flow simulation versus crank angle

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Figure 12

Characteristic map of the turbine obtained by 3D simulation

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Figure 13

Comparing characteristic curves of the turbine at the engine speed of 998 rpm

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Figure 14

Comparing characteristic curves of the turbine at the engine speed of 2500 rpm

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Figure 15

Comparing characteristic curves of the turbine at the engine speed of 5000 rpm

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