| 摘要 |
PURPOSE: A manufacturing method of a turbine bucket and a tuning method of natural frequency of the turbine bucket are provided to improve performance of a gas turbine by restricting resonance of a blade regardless of flexure frequency without modifying the physical character of the turbine bucket. CONSTITUTION: The natural frequency of a turbine blade is tuned by using the orientation of the secondary axes. Torsional and stripe mode natural frequency of a turbine bucket is adjusted without altering any turbine bucket physical features, such as weight and/or shape, and without affecting flexure frequencies. The tuning of the turbine bucket natural frequencies serves to avoid detrimental blade resonance, and the reliability of a gas turbine improves. The tuning method includes investment casting of the turbine bucket with a single crystal alloy, and tuning the natural frequency of the turbine bucket without modifying physical features of the turbine bucket by placing a crystal seed along the desired direction according to the relative orientation of the engine axial direction.
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