Innovative cooling method named Multiple Angled Impingement, which realizes drastic reduction of cooling air used for turbine shrouds, has been invented. To confirm cooling performance of this cooling structure, we manufactured test pieces of dummy turbine shrouds to which Multiple Angled Impingement cooling structure and conventional impingement cooling structure were applied. Cooling performance tests were conducted using these test pieces for several Reynolds numbers of mainstream hot gas and cooling air flow. IR images on heated surfaces of the test pieces were captured for every Reynol...