スケールモデル蒸気タービンによる振動相似則の検証

概要

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Rotating blades of steam turbines are the essential machine parts to convert fluid force to mechanical force, and high reliability in operation, especially for vibratory strength, is the most important requirement. The vibratory characteristics and strength can be examined basically by laboratory element tests at the design stage. However, an actual loading test in a test turbine facility is the most assured and integrated method to verify the blade reliability. Due to restrictions on the quantity of steam supplied to the test turbine, the actual loading test is usually carried out using a scale-model turbine instead of a full-scale model turbine. Generally mechanical and aerodynamic laws of similarity are applied to the scale-model turbine. In the case of vibratory characteristics, however, there are related factors, such as damping, for which applicability of similarity laws is uncertain ; hence it should be confirmed whether the scale-model turbine test is effective in evaluating the vibratory strength of the rotating blades. Both full-scale model turbine tests and scale-model turbine tests were carried out under the same operating conditions in the same test turbine facility in order to investigate the vibration similarity. This paper shows the effectiveness of the actual loading test using the scale-model turbine as a verification test of blade reliability for vibratory strength.
社団法人日本機械学会の論文
1992-11-25