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Research Papers: Gas Turbines: Turbomachinery

Quantitative Computational Fluid Dynamics Analyses of Particle Deposition on a Subsonic Axial Compressor Blade

[+] Author and Article Information
Alessio Suman, Nicola Aldi, Michele Pinelli, Pier Ruggero Spina

Dipartimento di Ingegneria,
Università degli Studi di Ferrara,
Ferrara 44122, Italy

Rainer Kurz

Solar Turbines Incorporated,
San Diego, CA 92123

Mirko Morini

Dipartimento di Ingegneria Industriale,
Università degli Studi di Parma,
Parma 43121, Italy

Klaus Brun

Southwest Research Institute,
San Antonio, TX 78228

1Corresponding author.

Contributed by the Turbomachinery Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 15, 2015; final manuscript received July 22, 2015; published online August 25, 2015. Editor: David Wisler.

J. Eng. Gas Turbines Power 138(1), 012603 (Aug 25, 2015) (14 pages) Paper No: GTP-15-1314; doi: 10.1115/1.4031205 History: Received July 15, 2015; Revised July 22, 2015

In literature, there are some studies related to the fouling phenomena in transonic compressors, but, in industrial applications (heavy-duty compressor, pumping stations, etc.) the subsonic compressors are widespread. It is of great interest to the manufacturer to discover the fouling phenomenon related to this type of compressor. This paper presents three-dimensional numerical simulations of the microparticle ingestion on a subsonic axial compressor rotor carried out by means of a commercial computational fluid dynamic code. Particle trajectory simulations use a stochastic Lagrangian tracking method that solves the equations of motion separate from the continuous phase. The number of particles, sizes, and concentrations are specified in order to perform a quantitative analysis of the particle impact on the blade surface. In this paper, the particle impact pattern and the kinematic characteristics (velocity and angle) of the impact are shown. Both of the blade zones affected by particle impact and the blade zones affected by particle deposition are analyzed. The particle deposition is established by using the quantity called sticking probability (SP). The SP links the kinematic characteristics of particle impact on the blade with fouling phenomenon. The results show that microparticles tend to follow the flow by impacting at full span with a higher impact concentration on the leading edge (LE). The suction side (SS) is affected only close to the LE and, at the hub, close to the trailing edge (TE). Particular fluid-dynamic phenomena such as separation, stagnation, and tip leakage vortex strongly influence the impact location of the particles. The kinematic analysis showed a high tendency of particle adhesion on the SS, especially for smaller particles for which the fluid dynamic phenomena play a key role regarding particle impact velocity and angle.

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Figures

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Fig. 1

Performance: compression ratio and efficiency

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Fig. 2

Capture efficiency ηhit and Stokes number St versus particle diameter dp

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Fig. 3

DPM concentrations (kg/m3)

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Fig. 4

Particle impact distributions, PS and SS

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Fig. 5

Particle trajectories at the hub and at the blade tip, SS, case 2

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Fig. 6

Particle distributions ΧSLICE, second, sixth, and tenth strip, case 1

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Fig. 9

SP and tangential velocity vt, second and tenth strip, case 1

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Fig. 7

Impact velocity vi, second, sixth, and 11th strip, case 1

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Fig. 8

Impact angle α, second and tenth strip, case 2

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Fig. 10

Trends of the ratio nhit,SP>0.5 and ηhit superimposed

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Fig. 11

Spanwise subdivision with average value of span location (left side) and overall impact patterns

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