| 摘要 |
<p>A multi-spool turbofan engine (6) has a plurality of circumferentially spaced poppet valves (60) with diverters (80) secured thereto for precisely controlling bleed of combustion gas aft of the high pressure turbine whereby the high pressure spool (30) operates at high idle RPM so as to power accessories and the low pressure spool (12) operates at low RPM so as to minimize noise and fuel consumption. Efficient and precise control of hot gas bleed is achieved by placement of the diverters (80) downstream of the high pressure turbine and upstream of the intermediate pressure turbine (22) in combination with poppet valves (60) to control the diversion as well as flow induced by the pressure differential between the hot gas flow between the turbines and flow in the by-pass duct.</p> |
