Intensification of oil cooling by installing an air-oil heat exchanger in the bypass duct of a bypass turbojet engine

Abstract

The article substantiates the need to intensify the process of oil cooling in oil systems of aircraft turbojet engines. Currently, the thrust of turbojet engines increase is achieved by increasing of air pressure increase degree in the compressor and the gas temperature in front of the turbine. However, an increase of these parameters values leads to an increase of the engine elements thermal load, including the rotor supports, which causes an increase of oil temperature. In oil systems of modern turbojet engines. The oil systems of modern turbojet engines still use the same oils as several decades ago. Therefore, the intensification of the oil cooling process, which allows to reduce its temperature, is the main way to preserve the lubricating properties. It is proposed to intensify the oil cooling process in oil system of the bypass turbojet engine in the form of installation of an air-oil heat exchanger in bypass circuit. A thermal calculation of fuel-oil and air-oil heat exchanges has been carried out, the results of which show large values of the heat transfer coefficient when the oil is cooled by bypass circuit air.