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research-article

Using a Bowed Blade to Improve Supersonic Flow Performance in the Nozzle of a Supersonic Industrial Steam Turbine

[+] 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

Zhongqi Wang

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

1Corresponding author.

ASME doi:10.1115/1.4036495 History: Received August 03, 2016; Revised March 04, 2017

Abstract

For solar plants, waste-energy recovery and turbo generators, there is a considerable amount of waste energy due to low mass flow rate. Owing to the high specific power output and large pressure ratios across the turbine, a supersonic industrial steam turbine (IST) is able to utilize the waste energy associated with low mass flow rate. Supersonic IST have fewer stages than conventional turbines and a compact and modular design, thus avoiding the excessive size and manufacturing cost of conventional IST. Given their flexible operation and ability to function with loads in the range of 50 to 120% of the design load, supersonic IST offer significant advantages compared to conventional IST. The strong shock-wave loss caused by supersonic flows can be reduced by decreasing the shock intensity and reducing its influence; consequently, a supersonic IST can reach higher efficiency levels. Considering the demonstrated utility of bowed blades in conventional IST, this paper presents a study of the use of bowed blades in a supersonic IST. For this purpose, first, the shock-wave structure in the supersonic flow field was analyzed and compared with experimental results. Then, four different bowed blades were designed and compared with a straight blade to study the influence of bowed blades on the shock wave structure and wetness. The results indicate that S-shaped bowing can improve the efficiency of supersonic turbines, and the energy loss coefficient of the stators can be decreased by 2.4% or more under various operating conditions.

Copyright (c) 2017 by ASME
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