Modares Mechanical Engineering

Modares Mechanical Engineering

Comparison of Various Arrangement Effects of V-Shape Rib Technologies on Turbulence and Heat Transfer Enhancement in Gas Turbine Blade Internal Cooling

Authors
Hamidreza Shahbazian
Seyed Mostafa Hosseinalipour
Parisa Afkari
Abstract
Gas turbine power and thermal efficiency increase with inlet temperature. Considering the temperature limitations for the alloys used in gas turbine components, employment of techniques for reduction of these components temperatures seems to be an essential subject. Based on the research conducted on this subject, among all the proposed methods, rib cooling yields higher heat transfer coefficient and among various types of ribs, V-shaped ribs have higher heat transfer compared to angled rib. The purpose of this feasibility study is to investigate the two proposed ribs for use in gas turbine from heat transfer and fluid flow view and compare their thermal performance. In this work, 3-D numerical simulation has been performed for V-shaped ribs with an angle of 〖60〗^° for the two cases of staggered and inline ribs in two opposite walls in a rectangular channel. Experimental results have been used for validation. The results indicate an enhancement of ~22% in heat transfer if V-shaped ribs with an angle 〖60〗^° and downstream orientation are located in staggering form in two opposite walls of a channel. In this case, an increase of 10% is observed for pressure drop, however, its thermal performance increases 12% which is positive and considerable.
Keywords
Gas Turbine
thermal efficiency
blade cooling
Numerical simulation
Modares Mechanical Engineering
Volume 17, Issue 5
July 2017
Pages 316-326