Research On The Performance Of Exhaust Ejector Under Different Bending Angles And Swirling Conditions

For modern ships,gas turbine is one of the most important power plants,whose performance will directly affect the performance of the whole vessel.Exhaust system plays a vital role in performance of the entire gas turbine.During its operation,temperature of exhausted gas is high,radiating a lot of infrared signals through exhaust pipe,exhaust plume,and other parts of the cabin wall,which can affect the performance of military stealth ship in combat.Therefore,utilize exhaust ejector pumping function can environment can be used to cool down gas and infrared suppression,reducing temperature and suppressing infrared..Based on reading a lot of material on exhaust ejector domestic and overseas,associated with commercial software ANSYS FLUENT,circular cross-section of single-stage ejector exhaust were studied under different bend angles and spin flow angle conditions.Detailed research work is as follows:Through directly introducing experimental data of related foreign literature,equal proportion model were established to validate the relevant numerical simulation methods.Determine numerical simulation program in this paper,which laid foundation for the study on velocity gradient ejector performance of exhaust ejector research.Research on how elbow angle affect performance of ejector exhaust.Set bend angle 15 degrees for every simulation unit between 0 to 90 degrees.Build calculation model in different bend angles respectively,examining its impact on entrainment coefficient,total pressure loss,static pressure recovery and the mixing degree.Analyze flow field distribution and draw ejector performance characteristics curve,summarize laws of row bend angle impact on exhaust ejector performance.How angle swirl injector impact on performance of exhaust ejector was researched.Set swirl angle 10 degrees for every simulation unit between 0 to 40 degrees.Set different boundary conditions swirl angle respectively,study how entrainment angle impact the swirl coefficient,total pressure loss,static pressure recovery coefficients and the impact of mixing degree.Analyze flow field distribution,drawing ejector performance characteristics curves.Summarize law on how swirl angle affect performance of the exhaust ejector.Comprehensive research two velocity gradient producing forms——bend angle and swirl angle,determine unevenness of the speed as evaluation method.Utilize self-improved MATLAB program to calculate speed unevenness of the mixing tube outlet section,draw speed uneven curve and summarizes the rendering law how impact on the performance of exhaust ejector.Use numerical simulation to study variation of ejector performance parameters.Design a simple experimental program to provide reference for future research on exhaust ejector.