High-Temperature-Turbine Technology Program. Phase II. Technology Test and Support Studies. Turbine Spool Technology Rig, Cascade Tests

摘要

Integrated gas turbine combined cycle electric power generating systems offer the promise for using coal in an economic and environmentally acceptable manner. Powerplant efficiencies well above 40% may be achieved with gas turbine firing temperatures of 2600 exp 0 F and higher, if the turbine cooling requirements are not excessive. The US Department of Energy is sponsoring through the High Temperature Turbine Technology (HTTT) program, the development of advanced gas turbine components for such a system. The concept selected by Curtiss-Wright for this program utilizes transpiration air-cooling of the turbine subsystem airfoils. With moderate quantities of cooling air, this method of cooling has been demonstrated to be effective in a 2600 exp 0 F to 3000 exp 0 F gas stream. Test results show that transpiration air-cooling also protects turbine components from the aggressive environment produced by the combustion of coal-derived fuels. A new single-stage, high work transpiration air-cooled turbine has been designed and fabricated for evaluation in a rotating test vehicle designated the Turbine Spool Technology Rig (TSTR). Prior to operating the TSTR, a cascade test program was conducted on a 10-vane sector to determine the cooling characteristics of these parts and to develop changes as required to assure satisfactory operation of the TSTR. This report describes the cascade program, including several changes incorporated into the vanes. (ERA citation 07:014193)