Influence Of The Honeycomb Structure Parameters On The Performance Of Axial Ventilation

The axial ventilator is a new type of structure ventilator. It not only meets the low oil and gas separation efficiency, but also saves the weight of the aircraft engine, and is used by more and more series of engines. A honeycomb structure installed on the annular cavity in this ventilation, it has a higher oil and gas separation efficiency without affecting the ventilation performance.This paper first carries on the estimate analysis of the axial ventilator honeycomb structure and its internal flow, obtains the basic understanding. Then, makes the necessary simplification to the actual situation, establishment mathematics physics model. By using the method of the composite motion theorem of points, to analysis the force of lubricating oil particles in honeycomb holes, and establish the particle trajectories of kinematic equations, the separation mechanism of particles in honeycomb is used as the judgment basis for the oil separation in the particle trajectory equation of motion. Then the minimum separating particle size and separation efficiency of the lubricating oil in the honeycomb cell are calculated. At the same time using the CFD method and DPM model to simulate the internal flow of the honeycomb structure, obtained the trajectory of oil particles and its separation characteristics, and verified the reliability of the particle trajectory differential equation.The computational scheme is to use two methods which are without considering the Coriolis force method and considering the Coriolis force method to solve the motion trajectory equation of oil particles in honeycomb. The results showed that the minimum separating particle size and separation efficiency are consistent with the trend of the change of speed and flow rate; For the short length and large aperture of the honeycomb structure, and in the case of small flow can be calculated by the method without considering the Coriolis force; When certain parameters of the honeycomb structure, as the speed increases, the air flow rate decreases, the minimum separation of the particle size decreases, the separation efficiency is improved; The larger length, smaller pore size of the honeycomb structure, the smaller the particle size of the minimum separation, the higher separation efficiency and the impact of the air flow in the honeycomb hole length and aperture effect is more significant.