TURBOPROP ENGINE WITH AN OIL SUPPLY SYSTEM AND METHOD FOR SUPPLYING OIL FOR A TURBOPROP ENGINE

摘要

An oil supply system for a propeller turbine engine includes a first oil circuit for supplying the turbomachine and a second oil circuit for supplying the propeller gearbox and the high-pressure pump associated with a propeller adjusting device. The two oil circuits are integrated into a common oil tank and connected to one another by means of an oil supply line in the flow direction downstream of the first and the second oil conveying pumps in such a way that a limited oil volumetric flow can flow from the first oil circuit into the second oil circuit, and only in this direction, if the pressure difference between the first and the second oil circuits falls below a certain level in the event of a pressure reduction in the second oil circuit. In this way, a sufficiently high initial pressure of the oil is produced at the high-pressure pump, even at low propeller speeds and during transient propeller adjustment processes, so that the function of the propeller adjusting device is not impaired and the high-pressure pump is not damaged. Limiting the oil volumetric flow in the oil supply line connecting the two oil circuits prevents that the turbomachine is inadequately supplied with oil, while oil is being removed from the first oil circuit.