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Gas Turbines: Industrial & Cogeneration

An Integrated Particle-Tracking Impact/Adhesion Model for the Prediction of Fouling in a Subsonic Compressor

[+] Author and Article Information
D. Borello

Dipartimento di Ingegneria Meccanica e Aerospaziale,  Sapienza Università di Roma Via Eudossiana, 18, 00184, Rome, Italyborello@dima.uniroma1.it

F. Rispoli

Dipartimento di Ingegneria Meccanica e Aerospaziale,  Sapienza Università di Roma Via Eudossiana, 18, 00184, Rome, Italyrispoli@dima.uniroma1.it

P. Venturini

Dipartimento di Ingegneria Meccanica e Aerospaziale,  Sapienza Università di Roma Via Eudossiana, 18, 00184, Rome, Italyventurini@dima.uniroma1.it

J. Eng. Gas Turbines Power 134(9), 092002 (Jul 23, 2012) (7 pages) doi:10.1115/1.4006840 History: Received October 10, 2011; Revised April 24, 2012; Published July 23, 2012; Online July 23, 2012

The present paper reports on the analysis of the motion of adhesive particles and deposit formation in a 3D linear compressor cascade in order to investigate the fouling in turbomachinery flows. The unsteady flow field is provided by a prior hybrid large-eddy simulation (LES)/Reynolds-averaged Navier-Stokes (RANS) computation. The particles are individually tracked and the deposit formation is evaluated on the basis of the well-established Thornton and Ning model. Although the study is limited to three regions of the blade, where the most relevant turbulent phenomena occurs, the prediction of fouling shows good agreement with real situations. Deposits form near the casing and the hub, in the zones where there are strong vortical structures originated by the tip leakage and hub vortices. On the blade, the deposit analysis is focused on three main regions: (a) along the stagnation region on the leading edge; (b) on the suction side, where the particles are conveyed by the hub vortex towards blade surfaces; and (c) on the pressure side, where a clean zone forms between leading edge and the blade surface, as can be seen in real compressors.

Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Coefficient of restitution as a function of the ratio 1/ωy for different value of ωsy

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Figure 2

Experimental setup [30]

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Figure 3

Computational grid

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Figure 4

Zones of the domain where particles are released

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Figure 5

Preliminary simulation: views of some particle trajectories within the simulated compressor blade vane

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Figure 6

Isosurface of Q = 60 colored with pressure value

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Figure 7

Streamlines on the suction (left) and pressure (right) side

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Figure 8

Particle trajectories on the suction (left) and pressure (right) side

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Figure 9

Deposit on the lower endwall

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Figure 10

Deposit on upper endwall

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Figure 11

Deposit on the blade surface (suction side view) (mg/m2 )

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Figure 12

Deposit on the blade surface (pressure side view)

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Figure 13

Deposit on the blade surface (suction side view)

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Figure 14

Deposit on the pressure surface: experiments by Vigueras Zuniga (left) [35], present simulation (right), dashed line indicates the ’clean’ leading edge region

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Figure 15

Deposit on the suction surface: experiments by Vigueras Zuniga (left) [35], present simulation (right); the circles show the deposit induced by the presence of large recirculation due to the development of hub vortex

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