White noise response of turbine blades subjected to heat flux and thermal gradient

Conference · Tue Jul 01 04:00:00 EDT 1997

OSTI ID:485125

Karadag, V ^[1]; Aba, E ^[2]; Morguel, O K ^[3]

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1. Technical Univ. of Istanbul (Turkey). Dept. of Mechanical Engineering
2. Turkish Wagon Industry, Adapazari (Turkey). Dept. of Research and Development
3. Sakarya Univ., Adapazari (Turkey). Dept. of Mechanical Engineering

Design and production of the complex mechanical structures rarely result in an optimal solution. A typical example for this is a turbine blade design. Fatigue failures of the turbine blades is one of the most vexing problems of turbo-machine manufacturers, ever since the steam turbine became the main stay for power generating equipment and the gas turbines are increasingly used in air transport. Turbine blade failures due to fatigue are predominantly vibration related. The dynamic loads on the blading can arise from many different sources such as the high rotational speed, the high operating temperatures, the asymmetric aerofil tapered form of the turbine blade etc. Therefore, vibratory analysis is one of the most important stage in the designing of the turbine blades. In this study, the random response of the turbine blade to white noise excitation has been consistently calculated, including the internal damping mechanisms of the blade. Beside the damping effects, the rotational speed and the linear thermal gradient along the turbine blade are incorporated into the analysis. Pressure difference between the two surfaces of the turbine blades are modelled as white noise excitation along all over the turbine blade. The system dynamic equation of motion are derived and solved by using the combined Finite Element-Modal Analysis Method.

• OSTI ID: 485125
• Report Number(s): CONF-970146--; ISBN 1-890277-03-7
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
33 ADVANCED PROPULSION SYSTEMS
DAMPING
EQUATIONS OF MOTION
FATIGUE
GAS TURBINE ENGINES
HEAT FLUX
MATHEMATICAL MODELS
SOUND WAVES
STEAM TURBINES
TEMPERATURE GRADIENTS
TURBINE BLADES