| 摘要 |
<p>A compound engine comprises a positive displacement engine (100), such as a reciprocating or rotary piston diesel engine, which is linked to a turbine/turbocompressor set in the form of a gas turbine engine (102) with a free power turbine (138). The exhaust gases of the positive displacement engine pass through a duct (122) to the combustor (116) of the gas turbine engine to help drive its turbine (134), which drives the turbocompressor (106), when in turn turbocharges the positive displacement engine (100) through a duct (108). The turbocharging air duct (108) includes a valve (109) for selectively preventing delivery of turbocharging air to the positive displacement engine (100) so that the gas turbine engine can be operated while the positive displacement engine is shut down. In order to assure good scavenging of spent combustion products from the positive displacement engine (100) and a good match between the compression and expansion characteristics of the gas turbine engine (102) and the positive displacement engine, the turbocharging air duct (108) delivers the turbocharging air to the positive displacement engine at a first, higher, pressure and the combustion gas exhaust duct (122) exhausts the combustion gas to the combustor (116) at a second, lower pressure. Methods of operating the compound engine are also disclosed.</p> |
