Study on Heat Transfer Model Modification of Air Oil Radiator for Aircraft Generator

With the continuous development of aero engine technology, the heat dissipation requirements of lubricating oil system and high-power components of engine increase. It is necessary to cool a stream of high-temperature lubricating oil by using low-temperature external culvert air through air lubricating radiator. In order to verify the heat dissipation effect of the air lubricating radiator, it is necessary to carry out a series of component level heat transfer characteristic tests under typical working conditions, and modify the calculation model of the radiator based on the test results. In order to improve the calculation accuracy of the heat transfer model under all working conditions, the evaluation objective of the selection of the correction coefficient was proposed to be the average value of the absolute deviation between the test results of the heat transfer characteristics of the oil outlet temperature index of the air lubricating radiator and the calculated results of the model under typical state points. The evaluation objectives under a series of correction coefficients were calculated respectively, and the correction coefficients under the minimum condition of the evaluation objectives were finally selected. The screened correction coefficients were put into the original calculation model of air lubrication radiator heat transfer, so as to improve the calculation accuracy of the model under all working conditions.