scholarly journals Influence of Heat Transfer on Gas Turbine Performance

10.5772/20196 ◽  
2011 ◽  
Author(s):  
Diango A. ◽  
Perilhon C. ◽  
Danho E. ◽  
Descombes G.
Keyword(s):  
Heat Transfer ◽  
Gas Turbine ◽  
Turbine Performance

scholarly journals The Effect of Heat Transfer on Turbine Performance

2020 ◽  
Vol 142 (09) ◽  
pp. 56-57
Author(s):  
Lachlan J. Jardine ◽  
Robert J. Miller
Keyword(s):  
Heat Transfer ◽  
High Pressure ◽  
Gas Turbine ◽  
Turbine Blades ◽  
Large Temperature ◽  
Gas Turbine Blades ◽  
Turbine Performance ◽  
Very High

Abstract For over 50 years, high-pressure gas turbine blades have been cooled using air bled from the compressor. This cooling results in very high rates of heat transfer, both within the fluid and within the blade, shown in figure 1. The heat transfer often occurs across large temperature differences and is thus highly irreversible. It is therefore surprising that little is understood about the effect of this heat transfer on turbine performance.

Optimization of Cooling Passages Within a Turbine Vane

2005 ◽  
Author(s):  
Grzegorz Nowak ◽  
Włodzimierz Wro´blewski ◽  
Tadeusz Chmielniak
Keyword(s):  
Heat Transfer ◽  
Gas Turbine ◽  
Cooling System ◽  
Negative Effects ◽  
Optimization Task ◽  
Turbine Performance ◽  
Turbine Vanes ◽  
Turbine Vane ◽  
Internally Cooled ◽  
High Temperature Components

The trends in gas turbine technology aim to build more and more efficient cycles, which is usually achieved by the temperature increase at the inlet of the turbine. To prevent the negative effects of elevated temperature some actions are taken concerning, among others cooling of the high temperature components. Since the structure of the cooling system affects the turbine performance, it is essential to carry out the optimization to make it as efficient as possible. In this paper we show some aspects of passage optimization for internally cooled gas turbine vanes. In the present study the vane profile is taken as aerodynamically optimal. The analysis involves the optimization of the location and size of circular cooling passages within the vane. The analysis is performed by means of the genetic algorithm for the optimization task and FEM for the heat transfer predictions within the blade.

scholarly journals Heat Transfer Effect on Micro Gas Turbine Performance for Solar Power Applications

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6745
Author(s):  
Mahmoud A. Khader ◽  
Mohsen Ghavami ◽  
Jafar Al-Zaili ◽  
Abdulnaser I. Sayma
Keyword(s):  
Heat Transfer ◽  
Power Systems ◽  
Gas Turbine ◽  
Computational Study ◽  
Thermodynamic Cycle ◽  
Operating Conditions ◽  
Micro Gas Turbine ◽  
Turbine Performance ◽  
Wide Range ◽  
The Cost

This paper presents an experimentally validated computational study of heat transfer within a compact recuperated Brayton cycle microturbine. Compact microturbine designs are necessary for certain applications, such as solar dish concentrated power systems, to ensure a robust rotodynamic behaviour over the wide operating envelope. This study aims at studying the heat transfer within a 6 kWe micro gas turbine to provide a better understanding of the effect of heat transfer on its components’ performance. This paper also investigates the effect of thermal losses on the gas turbine performance as a part of a solar dish micro gas turbine system and its implications on increasing the size and the cost of such system. Steady-state conjugate heat transfer analyses were performed at different speeds and expansion ratios to include a wide range of operating conditions. The analyses were extended to examine the effects of insulating the microturbine on its thermodynamic cycle efficiency and rated power output. The results show that insulating the microturbine reduces the thermal losses from the turbine side by approximately 11% without affecting the compressor’s performance. Nonetheless, the heat losses still impose a significant impact on the microturbine performance, where these losses lead to an efficiency drop of 7.1% and a net output power drop of 6.6% at the design point conditions.

A213 A Study on the Effect of Angled Pin Fins on Endwall Heat Transfer(Gas Turbine-7)

2009 ◽  
Vol 2009.2 (0) ◽  
pp. _2-73_-_2-78_ ◽  
Author(s):  
Yusuke Motoda ◽  
Kenichiro Takeishi ◽  
Yutaka Oda ◽  
Yoshiaki Miyake
Keyword(s):  
Heat Transfer ◽  
Gas Turbine ◽  
Pin Fins

scholarly journals Fully Coupled Large Eddy Simulation of Conjugate Heat Transfer in a Ribbed Channel with a 0.1 Blockage Ratio

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2096
Author(s):  
Joon Ahn ◽  
Jeong Chul Song ◽  
Joon Sik Lee
Keyword(s):  
Heat Transfer ◽  
Gas Turbine ◽  
Conjugate Heat Transfer ◽  
Heat Transfer Analysis ◽  
Scale Model ◽  
Computational Domain ◽  
Blockage Ratio ◽  
Ribbed Channel ◽  
Large Eddy ◽  
Cooling Passage

Large eddy simulations are performed to analyze the conjugate heat transfer of turbulent flow in a ribbed channel with a heat-conducting solid wall. An immersed boundary method (IBM) is used to determine the effect of heat transfer in the solid region on that in the fluid region in a unitary computational domain. To satisfy the continuity of the heat flux at the solid–fluid interface, effective conductivity is introduced. By applying the IBM, it is possible to fully couple the convection on the fluid side and the conduction inside the solid and use a dynamic subgrid scale model in a Cartesian grid. The blockage ratio (e/H) is set at 0.1, which is typical for gas turbine blades. Through conjugate heat transfer analysis, it is confirmed that the heat transfer peak in front of the rib occurs because of the impinging of the reattached flow and not the influence of the thermal boundary condition. When the rib turbulator acts as a fin, its efficiency and effectiveness are predicted to be 98.9% and 8.32, respectively. When considering conjugate heat transfer, the total heat transfer rate is reduced by 3% compared with that of the isothermal wall. The typical Biot number at the internal cooling passage of a gas turbine is <0.1, and the use of the rib height as the characteristic length better represents the heat transfer of the rib.

scholarly journals Gas Turbine Performance Forecast and Assessment: GE LM2500 in Outlook

2021 ◽  
Vol 1107 (1) ◽  
pp. 012025
Author(s):  
A. El-Suleiman ◽  
O.D. Samuel ◽  
S.T. Amosun ◽  
I. Emovon ◽  
F. I. Ashiedu ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Turbine Performance
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