Insert for gas turbine nozzle vane and corresponding method of installation

摘要

A pair of hollow elongated insert bodies are disposed in one or more of the nozzle vane cavities of a nozzle stage of a gas turbine. Each insert body (80, 82) has an outer wall portion (86) with apertures (94) for impingement-cooling of nozzle wall portions in registration with the outer wall portion. The insert bodies are installed into the cavity separately and spreaders (100) flex the bodies toward and to engage standoffs (96) against wall portions of the nozzle whereby the designed impingement gap between the outer wall portions of the insert bodies and the nozzle wall portions is achieved. The spreaders are secured to the inner wall portions (88) of the insert bodies and the bodies are secured to one another and to the nozzle vane by welding or brazing.