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research-article

Experimental Investigation of the Grouped Blade Vibration for Steam Turbine by Non-contact Sensors

[+] Author and Article Information
Tomomi Nakajima

Research & Development Center, Mitsubishi Hitachi Power Systems, Ltd., Saiwai-cho 3-1-1, Hitachi, Ibaraki, Japan
tomomi_nakajima@mhps.com

Kiyoshi Segawa

Research & Development Center, Mitsubishi Hitachi Power Systems, Ltd., Saiwai-cho 3-1-1, Hitachi, Ibaraki, Japan
kiyoshi_segawa@mhps.com

Hiromichi Kitahara

Turbomachinery Headquarters, Mitsubishi Hitachi Power Systems, Ltd., Saiwai-cho 3-1-1, Hitachi, Ibaraki, Japan
hiromichi_kitahara@mhps.com

Akimitsu Seo

Turbomachinery Headquarters, Mitsubishi Hitachi Power Systems, Ltd., Saiwai-cho 3-1-1, Hitachi, Ibaraki, Japan
akimitsu_seo@mhps.com

Yutaka Yamashita

Turbomachinery Headquarters, Mitsubishi Hitachi Power Systems, Ltd., Saiwai-cho 3-1-1, Hitachi, Ibaraki, Japan
yutaka1_yamashita@mhps.com

Takeshi Kudo

Turbomachinery Headquarters, Mitsubishi Hitachi Power Systems, Ltd., Saiwai-cho 3-1-1, Hitachi, Ibaraki, Japan
takeshi_kudo@mhps.com

1Corresponding author.

ASME doi:10.1115/1.4038282 History: Received July 27, 2017; Revised August 23, 2017

Abstract

All turbine blades have mistuned structures caused by manufacturing variations within the manufacturing tolerance, such as the geometrical deviations and variance of material properties. The mistuning effect has a known tendency to increase the dynamic stress, but it is also known to be difficult to predict the maximum vibration response before the operation. This paper studies the blade vibration of grouped blades in a low-pressure steam turbine. The study objectives are to characterize the vibration behavior of the grouped blade structure and to evaluate the maximum response of all blades in a stage. An experimental investigation is carried out in a vacuum chamber, and blades are excited by an air jet during start-up and shut-down. The circumferential blade amplitude distribution is measured by non-contact sensors and strain gauges. The circumferential blade amplitude distribution is found to differ depending on vibration modes and nodal diameters, but the relative tendency is almost the same for all types of operation at each mode and all nodal diameters. Therefore, the median of all experimental results obtained with the non-contact sensors is used in a comparison with calculation results and results of two theoretical curves obtained using equations from the literature. In comparing the measurement results and the calculation results, the circumferential blade amplitude distribution is not the same with all modes and nodal diameters. However, the maximum amplitude magnification is about 1.5-1.8, and all measurement results are lower than the results for the two theoretical equations.

Copyright (c) 2017 by ASME
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