Study The Effect About Mechanical Properties And Life Of The Cooling In The Aircraft Engine Flame Tube

The aero-engine flame tube is the most stringent high-temperature part in the working environment of the aero-engine,and its cooling efficiency and service life have a decisive impact on the life cycle of the engine.At present,there are many researches on the cooling form and cooling effect of the flame cylinder body,but the study of life and mechanical properties is limited.This paper analyzes the pressure,temperature,mechanical properties,life and damage about a certain type of aero-engine flame cylinder under different cooling air flows.And compares the calculation results of whether the combustion is considered.The specific content is as follows:1.Through the analysis of the calculation results of pressure,temperature,mechanical characteristics,life and damage of the hole wall under different cooling air intake,the cooling effects of single film holes,along-exhaust film holes and staggered film holes are compared,and the influence of different hole shapes and arrangements on the film cooling effect of flat plate is studied.The results show that with the increase of cooling air intake,the cooling effect of film holes in different hole shapes and arrangements on the hole wall increases,but when the cooling effect reaches its limit,the cooling effect decreases with the increase of cooling air intake;The cooling effect of staggered gas film holes is better,the cooling effect of round holes is better and the stress condition is more uniform.2.By analyzing the calculation results of pressure,velocity vector,temperature,reactant and product distribution of a certain type of aero-engine flame cylinder wall,comparing the flow characteristics and cooling effect in the cylinder before and after increasing the film hole with that before and after combustion,the influence of increasing the film hole and chemical reaction on the cooling effect of the flame cylinder was studied.The results show that both gas film pore and chemical reaction will affect the pressure and temperature of the cylinder wall.Increasing gas film pore can effectively protect the cylinder wall and reduce the temperature of the cylinder.Chemical reaction has a great influence on the calculation of flow and heat transfer.Most of the results differ by about200 K without increasing the gas film pore.3.By analyzing the calculation results of stress,strain,deformation,life and damage to the flame cylinder of an aeroengine,the mechanical characteristics and life of the cylinder before and after increasing the film holes are compared,and the influence of the film holes on the life of the cylinder is studied.The results show that the stress of the flame cylinder with gas film holes is not significantly different from that of the initial state under the same flow rate of cooling air,and the fatigue and damage conditions are also small.There are only local differences near the flanging holes and mixing holes,and the stress conditions are within 1% and the fatigue damage conditions are within 2%.