Turbofan Engine Main Bearing Ring, Oil Analysis

Rolling bearings are used around the turbo-fan engines,and they are in very bad condition.In the high DN, the method is to use the inner ring oil supplying, improving the flowing condition of oil in bearings.It makes oil passing through the inner ring and lubricating the whole inner and outer rings symmetrical.The inner ring oil supplying method of bearings in aeroengines is very advanced in the word. It is mastered by several overseas companys of aeroengines and in our nation it is just in research.And the bearing oil cavity of one aeroengine to inner ring oil supplying by Heat Transfer are thermal analyzed. The major heat sources of bearing oil cavity are analyzed. The models for calculating heat generations of both bearing and carbon graphite seal are established.With the finite difference method, the bearing oil cavity system is dispersed into a group of temperature nodes. Based on kichhoff's energy law, kichhoff's energy equilibrium equation is established at each temperature node. These thermal equilibrium can be solved by quasi-Neton technique. Acquired the calculated results of the temperature fields of the bearing cavity are obtained from the solutions of 8 different operation conditions and are consistent with the practical results.