| 摘要 |
The invention relates to a turboprop engine having an inlet opening provided in the engine cage for cooling air for the cage interior and for an air/liquid heat exchanger arranged in this interior, having a cooling air delivery device as well as having an air guiding duct which accommodates the liquid/air heat exchanger and carries away the heat exchanger exhaust air. Such a turboprop engine is known from U.S. Patent Document US-A-2,593,541. In this case, the air flow provided for an air oil cooler arrives directly from an inlet opening in the engine cage at the air oil cooler. The oil cooler exhaust air is carried away by way of the turbine exhaust air duct, the corresponding introduction device of the cooling air flow into the turbine exhaust air duct being constructed in the form of an ejector so that a cooling air delivery device is provided in the shape of this ejector. Such a cooling air delivery device is useful for those operations of the turboprop engine in which an aircraft equipped with this engine rolls along on the ground, particularly if a rolling along in the reverse direction takes place.
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