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Research Papers: Techniques and Procedures

A Pioneering Method for Reducing Water Droplet Erosion

[+] Author and Article Information
Hong Yao

School of Energy Science and Engineering,
Harbin Institute of Technology,
Harbin 150001, China
e-mail: hityaohong@gmail.com

Xun Zhou

School of Energy Science and Engineering,
Harbin Institute of Technology,
Harbin 150001, China
e-mail: zhouxun@hit.edu.cn

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received June 12, 2017; final manuscript received December 10, 2017; published online January 30, 2018. Assoc. Editor: Samuel Paolucci.

J. Fluids Eng 140(6), 061401 (Jan 30, 2018) (5 pages) Paper No: FE-17-1344; doi: 10.1115/1.4038802 History: Received June 12, 2017; Revised December 10, 2017

Based on computational fluid dynamics and the finite volume method, water droplet erosion in the last stage of an industrial steam turbine was researched and the trajectories of the water droplets were traced by using the Lagrange method. Under steady conditions, the influence of variant bowed vane designs was compared based on the distribution and movement trends of the secondary water droplets. In addition, the effects of the bowed blades on water movement at the vane surfaces and their impact areas and intensity on the blades were analyzed. The results showed that: (1) a negatively bowed blade can reduce the speed of the secondary water droplets at the mid span of the blade, which are also effective for water droplets on the surface of the vanes and (2) a negatively bowed blade improves the speed of the secondary droplets on the end walls of vanes, which is advantageous to the secondary droplets through blade passage and reduction of secondary droplet impulse on the blades.

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Figures

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Fig. 2

Pressure loss at variant steam inlet velocities

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Fig. 1

Streamlines of steam and droplets: (a) droplet diameter 5 μm, (b) droplet diameter 10 μm, and (c) droplet diameter 15 μm

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Fig. 3

Pressure distribution between inlet and outlet

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Fig. 4

Bowed blade parameters

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Fig. 5

Track of secondary droplets and steam: (a) negative bowed, (b) straight, and (c) positive bowed

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Fig. 6

Radial distribution of circumferentially averaged steam velocity at the stator outlet

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Fig. 7

Radial distribution of static pressure at the stator outlet

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Fig. 8

Distribution of erosion rate for three blades: (a) negative bowed, (b) straight, and (c) positive bowed

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