Optimization Of Separation Efficiency And Flow Resistance Of Honeycomb Ventilator

In recent years,as a new type of ventilator,the axial ventilator has been widely used as the oil-gas separator in modern advanced aero-engines.It has excellent oil-gas separation ability while saving engine weight.Its perfect optimization will play a vital role in the improvement of ventilators and the advancement of aero-engines.Because the axial ventilator will be constrained by its own design,manufacture and the specific location of installation,it is not possible to improve its oil-gas separation ability only by increasing the rotational centrifugal force,and more consideration must be given to the barrier,agglomeration and other effects of lubricating oil particles.According to the structure and size parameters of a certain-type engine rear ventilator,this paper studies the optimization of honeycomb ventilator based on oil-gas separation efficiency and flow resistance.For the optimization problem based on separation efficiency,the particle kinematics method is used to calculate the particle trajectory and separation efficiency under various operating parameters of the ventilator tester,considering the Coriolis force of the moving particles in the honeycomb hole of the rotary ventilator.Using the CFD method,calculate the flow in the ventilator tester and determine the flow velocity and particle velocity of oil-gas mixture at the honeycomb hole inlet.For the optimization problem based on flow resistance,the method of combining engineering algorithm and computational fluid dynamics（CFD）is used to establish a semiempirical formula for calculating the relationship between the flow resistance of the ventilator and the structural parameters and operating parameters.Flow resistance of ventilator includes centrifugal resistance loss,on-way resistance loss,local resistance loss:Δp=∑（Δpn+Δpf+Δpk）,using CFD method to calculate the local loss coefficient in the ventilator.The theory and method of impeller machinery are used to calculate the centrifugal resistance of the oil-gas mixture flow through the ventilator.Calculate the separation efficiency and flow resistance under different structural parameters of ventilators and honeycomb holes,and give the design range of the honeycomb structure parameters under certain structural and operational constraints,as well as the target values of separation efficiency and flow resistance.