Thermo-structural analysis of HP stage gas turbine blades having helicoidal cooling ducts

Kini , Chandrakant R and Shenoy, Satish B and Sharma, Yagnesh N (2014) Thermo-structural analysis of HP stage gas turbine blades having helicoidal cooling ducts. International Journal of Advancements in Mechanical and Aeronautical Engineering, 1 (2). pp. 57-60. ISSN 2372-4153

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Abstract

In most of the practical gas turbines, the turbine blades of HP stage are usually too small to employ the turbine blade cooling techniques effectively. The growing need for effective blade cooling techniques is a direct consequence of the continuous quest for greater fuel economy. It is very well known that the thermal efficiency and power output of gas turbines increase with increasing turbine entry temperature (TET). The current TET level in advanced gas turbines is far above the melting point of the blade material. An attempt has been made in this paper to computationally analyze the thermo-structural analysis of HP stage turbine blade for effective cooling using innovative cooling passages within the blade. A helicoidal shaped duct has been analyzed corresponding to different cross section, diameters and pitch length. It is found from the analysis that helicoidal cooling duct of circular cross section of pitch length 6 mm radius 2 mm having turbulators (e/D = 0.08 and 0.75 mm rib thickness) and helicoidal cooling duct of elliptical cross section of pitch length 6 mm, major axis 2 mm and minor axis 2.5 mm result in better cooling effects and in turn reduces structural distortion.

Item Type: Article
Uncontrolled Keywords: thermo-structural analysis, helicoidal cooling ducts, structural deformation
Subjects: Engineering > MIT Manipal > Aeronautical and Automobile
Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 20 Apr 2015 05:30
Last Modified: 20 Apr 2015 05:30
URI: http://eprints.manipal.edu/id/eprint/142477

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