Abstract
The high temperature gas turbine with high loaded turbine cascade is under development to prevent the global warming effect by the carbon dioxide and to save natural resources. The larger loss at the high loaded turbine cascade is generated by the secondary flow including horseshoe vortex. In this research flow visualization and the loss measurement were carried out to understand the behavior of the horseshoe vortex and its effect on the loss. The internal flow measurement showed that the loss increased greatly toward the trailing edge of the blade suction surface root. The suction surface fins were tested as a countermeasure and proved to reduce the peak loss of the secondary flow.
