2020 年 19 巻 4 号 p. 332-340
In order to address the energy-saving and the recent environmental problems such as global warming due to CO2 emissions, continuous efforts are required to improve the performance of the steam turbines and the gas turbines, which support the base of energy conversion. With the aim of reducing the secondary flow losses within the highly loaded turbine cascade, the authors have proposed a new idea to install the plasma actuators on the inlet wall of the turbine cascade. To realize the high-performance concept, experimental investigations to clarify the vortex structure near the enwall of a cascade by using smoke wire technique and PIV as a laser measurement system were carried out. And also, CFD using LES model were conducted to analyze the vortices system in detail by comparing experimental results with calculation. As a result, formation and development of the horseshoe vortex and the passage vortex within the highly loaded turbine cascade became clear through the streaks of smoke generated by the wire, velocity vectors obtained from PIV measurement and LES analysis.
