Effects of Damaged Rotor Blades on the Aerodynamic Behavior and Heat-Transfer Characteristics of High-Pressure Gas Turbines
Gas turbines are critical components of combined-cycle power plants because they influence the power output and overall efficiency. However, gas-turbine blades are susceptible to damage when operated under high-pressure, high-temperature conditions. This reduces gas-turbine performance and increases...
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2021-03-01
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doaj-630009f2612f45778f34e52da2ea23182021-03-17T00:03:35ZengMDPI AGMathematics2227-73902021-03-01962762710.3390/math9060627Effects of Damaged Rotor Blades on the Aerodynamic Behavior and Heat-Transfer Characteristics of High-Pressure Gas TurbinesThanh Dam Mai0Jaiyoung Ryu1Department of Mechanical Engineering, Chung-Ang University, Seoul 06911, KoreaDepartment of Mechanical Engineering, Chung-Ang University, Seoul 06911, KoreaGas turbines are critical components of combined-cycle power plants because they influence the power output and overall efficiency. However, gas-turbine blades are susceptible to damage when operated under high-pressure, high-temperature conditions. This reduces gas-turbine performance and increases the probability of power-plant failure. This study compares the effects of rotor-blade damage at different locations on their aerodynamic behavior and heat-transfer properties. To this end, we considered five cases: a reference case involving a normal rotor blade and one case each of damage occurring on the pressure and suction sides of the blades’ near-tip and midspan sections. We used the Reynolds-averaged Navier-Stokes equation coupled with the <i>k</i> − <i>ω</i> SST <i>γ</i> turbulence model to solve the problem of high-speed, high-pressure compressible flow through the GE-E<sup>3</sup> gas-turbine model. The results reveal that the rotor-blade damage increases the heat-transfer coefficients of the blade and vane surfaces by approximately 1% and 0.5%, respectively. This, in turn, increases their thermal stresses, especially near the rotor-blade tip and around damaged locations. The four damaged-blade cases reveal an increase in the aerodynamic force acting on the blade/vane surfaces. This increases the mechanical stress on and reduces the fatigue life of the blade/vane components.https://www.mdpi.com/2227-7390/9/6/627gas turbinecompressible flowdamaged rotor bladeaerodynamic characteristicheat-transfer coefficient |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Thanh Dam Mai Jaiyoung Ryu |
spellingShingle |
Thanh Dam Mai Jaiyoung Ryu Effects of Damaged Rotor Blades on the Aerodynamic Behavior and Heat-Transfer Characteristics of High-Pressure Gas Turbines Mathematics gas turbine compressible flow damaged rotor blade aerodynamic characteristic heat-transfer coefficient |
author_facet |
Thanh Dam Mai Jaiyoung Ryu |
author_sort |
Thanh Dam Mai |
title |
Effects of Damaged Rotor Blades on the Aerodynamic Behavior and Heat-Transfer Characteristics of High-Pressure Gas Turbines |
title_short |
Effects of Damaged Rotor Blades on the Aerodynamic Behavior and Heat-Transfer Characteristics of High-Pressure Gas Turbines |
title_full |
Effects of Damaged Rotor Blades on the Aerodynamic Behavior and Heat-Transfer Characteristics of High-Pressure Gas Turbines |
title_fullStr |
Effects of Damaged Rotor Blades on the Aerodynamic Behavior and Heat-Transfer Characteristics of High-Pressure Gas Turbines |
title_full_unstemmed |
Effects of Damaged Rotor Blades on the Aerodynamic Behavior and Heat-Transfer Characteristics of High-Pressure Gas Turbines |
title_sort |
effects of damaged rotor blades on the aerodynamic behavior and heat-transfer characteristics of high-pressure gas turbines |
publisher |
MDPI AG |
series |
Mathematics |
issn |
2227-7390 |
publishDate |
2021-03-01 |
description |
Gas turbines are critical components of combined-cycle power plants because they influence the power output and overall efficiency. However, gas-turbine blades are susceptible to damage when operated under high-pressure, high-temperature conditions. This reduces gas-turbine performance and increases the probability of power-plant failure. This study compares the effects of rotor-blade damage at different locations on their aerodynamic behavior and heat-transfer properties. To this end, we considered five cases: a reference case involving a normal rotor blade and one case each of damage occurring on the pressure and suction sides of the blades’ near-tip and midspan sections. We used the Reynolds-averaged Navier-Stokes equation coupled with the <i>k</i> − <i>ω</i> SST <i>γ</i> turbulence model to solve the problem of high-speed, high-pressure compressible flow through the GE-E<sup>3</sup> gas-turbine model. The results reveal that the rotor-blade damage increases the heat-transfer coefficients of the blade and vane surfaces by approximately 1% and 0.5%, respectively. This, in turn, increases their thermal stresses, especially near the rotor-blade tip and around damaged locations. The four damaged-blade cases reveal an increase in the aerodynamic force acting on the blade/vane surfaces. This increases the mechanical stress on and reduces the fatigue life of the blade/vane components. |
topic |
gas turbine compressible flow damaged rotor blade aerodynamic characteristic heat-transfer coefficient |
url |
https://www.mdpi.com/2227-7390/9/6/627 |
work_keys_str_mv |
AT thanhdammai effectsofdamagedrotorbladesontheaerodynamicbehaviorandheattransfercharacteristicsofhighpressuregasturbines AT jaiyoungryu effectsofdamagedrotorbladesontheaerodynamicbehaviorandheattransfercharacteristicsofhighpressuregasturbines |
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