Investigations on the Blade Vibration of a Radial Inflow Micro Gas Turbine Wheel
This paper demonstrates the investigations on the blade vibration of a radial inflow micro gas turbine wheel. Firstly, the dependence of Young's modulus on temperature was measured since it is a major concern in structure analysis. It is demonstrated that Young's modulus depends on...
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| Main Author: | |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2007-01-01
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| Series: | International Journal of Rotating Machinery |
| Online Access: | http://dx.doi.org/10.1155/2007/29270 |
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| Summary: | This paper demonstrates the investigations on the blade vibration
of a radial inflow micro gas turbine wheel. Firstly, the dependence of
Young's modulus on temperature was measured since it is a major concern
in structure analysis. It is demonstrated that Young's modulus depends on
temperature greatly and the dependence should be considered in vibration analysis,
but the temperature gradient from the leading edge to the trailing edge of a blade
can be ignored by applying the mean temperature. Secondly, turbine blades suffer
many excitations during operation, such as pressure fluctuations (unsteady
aerodynamic forces), torque fluctuations, and so forth. Meanwhile, they have many
kinds of vibration modes, typical ones being blade-hub (disk) coupled modes and
blade-shaft (torsional, longitudinal) coupled modes. Model experiments and FEM
analysis were conducted to study the coupled vibrations and to identify the modes
which are more likely to be excited. The results show that torque fluctuations and
uniform pressure fluctuations are more likely to excite resonance of blade-shaft (torsional,
longitudinal) coupled modes. Impact excitations and propagating pressure fluctuations
are more likely to excite blade-hub (disk) coupled modes. |
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| ISSN: | 1023-621X 1542-3034 |