Heat Transfer Process Intencification in AIrcraft Oil-Fuel Heat Exchange Tubes

The article substantiates the need to intensify of the oil cooling process in aircraft turbojet engines oil systems. The direction of engines development with the purpose of increasing thrust or reducing, at constant thrust, the size and weight of the engine, implies an increase in the temperature of the gases in front of the turbine. However, this circumstance lead to an increase in the thermal load of engine elements, including rotor supports, which causes an increase of oil temperature. The modern turbojet engines oil systems still use the same oils as several decades ago. Therefore, the oil cooling process intensification which allows reducing its temperature, is the main way to preserve the lubricating properties. It is proposed to the oil cooling process intensification in aircraft turbojet engine oil system by creating a transverse annular knurling in heat exchange tubes of the fuel-oil heat exchanger.