FAILURE MITIGATION AND FAILURE DETECTION OF INTERCOOLED COOLING AIR SYSTEMS OF GAS TURBINE ENGINES

摘要

A gas turbine engine (20) includes a first tap (72) connected to a compressor section (24) to deliver air at a first pressure. A heat exchanger (78) is downstream of the first tap (72). A cooling air valve (106a, 106b) selectively blocks flow of cooling air across the heat exchanger (78). A cooling compressor (84) is downstream of the heat exchanger (78) and pressurizes the air from the first tap (72) to a greater second pressure. A shut off valve (82) selectively stops flow of the air between the heat exchanger (78) and the cooling compressor (84). A controller (104) controls the cooling air valve (106a, 106b), the shut off valve (82), and the cooling compressor (84) such that the flow of the air is stopped between the heat exchanger (78) and the cooling compressor (84) only after the controller (104) has stopped the cooling compressor (84). A monitoring system (112) communicates with the controller (112) and includes a pressure sensor (112a) and a temperature sensor (112b) downstream of the cooling compressor (84).