回転管内における旋回流れ場に関する研究:第3報, 実験

概要

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In the previous papers, the swirling flow field in a rotating hollow turbine shaft was solved using computational fluid dynamics. It was observed that a large-scale spiral vortex existed at a place where the swirling flow turned radially outward. In this report, the pressure fluctuations in the swirling flow field are measured. The main part of the internal cooling air system of a gas turbine is used as the experimental apparatus. A specially devised liner in inserted inside the hollow turbine shaft and ten pressure sensors are embedded axially and circumferentially in the liner to measure the unsteady wall pressures. The pressure fluctuations which have the same characteristics as the rotating spiral vortex predicted in the numerical results are captured. The amplitude is great at the sensors near the place where the vortex was predicted in the nuberical results and the precession frequency of the rotating spiral vortex is in close agreement with the calculated frequency.
一般社団法人日本機械学会の論文
2000-02-25