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research-article

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
hityaohong@Gmail.com

Xun Zhou

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

1Corresponding author.

ASME doi:10.1115/1.4038802 History: Received June 12, 2017; Revised December 10, 2017

Abstract

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 solved by using the Lagrange method. Under steady conditions, the influence of variant bowed vane designs were compared based on the distribution and movement trends of the secondary water droplets, 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 effects of bowed blades on the secondary water droplet movement characteristics and water erosion intensity were examined under steady conditions. The results showed that: 1) a negatively bowed blade can reduce the speed of the secondary water droplets in the mid span of the blade, which are also effective for water droplets on the surface of the vanes; 2) a negatively bowed blade improves the speed of the secondary droplets on the endwalls of vanes, which is advantageous to the secondary droplets through blade passage and reduction of secondary droplet impulses on the blades.

Copyright (c) 2017 by ASME
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