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Research Papers: Gas Turbines: Industrial & Cogeneration

On the Behavior of Water Droplets When Moving Onto Blade Surface in a Wet Compression Transonic Compressor

[+] Author and Article Information
Lanxin Sun

 Harbin Engineering University, Harbin 150001, Chinasunlanxin@yahoo.com.cn

Qun Zheng

 Harbin Engineering University, Harbin 150001, Chinazhengqun@hrbeu.edu.cn

Mingcong Luo, Yijin Li

 Harbin Engineering University, Harbin 150001, China

Rakesh Bhargava

 Foster Wheeler USA Corporation, 585 N. Dairy Ashford, Houston, TX 77079Rakesh_Bhargava@fwhou.fwc.com

J. Eng. Gas Turbines Power 133(8), 082001 (Apr 07, 2011) (10 pages) doi:10.1115/1.4002822 History: Received June 23, 2010; Revised July 08, 2010; Published April 07, 2011; Online April 07, 2011

The process of wet compression in an axial compressor is an intricate two-phase flow involving not only heat and mass transfer processes but also droplet breakup and even formation of discontinuous water film on the blade surface and then breaking into droplets. In this paper, the droplet-wall interactions are analyzed using the theory of spray wall impingement through two computational models for an isolated transonic compressor rotor (NASA rotor 37). Model 1, representing spread phenomenon, assumes that all droplets impacting on the blade are trapped in the water film and subsequently released from its trailing edge and enter the wake region with an equivalent mass flow but bigger in diameter and smaller in number. Whereas, the model 2, representing splashing phenomenon, assumes that upon impacting on the blade, the droplets will breakup into many smaller ones. The three-dimensional flow simulation results of these two models are analyzed and compared in this paper.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Computational grids for NASA rotor 37

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Figure 2

Comparison of simulated results for various turbulence models with the experimental data

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Figure 3

Particle size distribution (γ=2.0,de=10 μm)

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Figure 4

Slip velocity needed to obtain We=1

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Figure 5

Schematic of droplet-wall interaction

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Figure 6

Schematic of droplet-wall interaction

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Figure 7

Schematic of forces on a film cell

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Figure 8

Spanwise distribution of film mass fraction from deposited droplets

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Figure 9

Water droplets motion trajectories with big droplets from shed water film (spread) (Inlet injection: RR size 10 μm; water flowrate 5.6 g/s (1%))

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Figure 10

Water droplets motion trajectories with droplet breakup due to impacting onto blade (splash) (inlet injection: RR size 10 μm; water flowrate 5.6 g/s (1%))

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Figure 11

Cold regions in computational domain

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Figure 12

Mach number contours on B2B surface of span 50% (black bold curve: 1 Ma)

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Figure 13

Temperature contours on B2B surface of span 50% (black bold curve: 302.6 K)

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Figure 14

Limiting streamlines on rotor blade suction surfaces

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