05 - Propulsion
AN EXPERIMENTAL SIMULATION ON THE INFLUENCE OF DIFFERENT FILM COOLING HOLE SHAPES ON PARTICLE DEPOSITION ON TURBINE VANE
Z. Liu¹, R. Ruan¹, L. Cheng¹, Y. Zhang¹, Z. Liu¹, D. Wu¹; ¹Northwestern Polytechnical University, China
When aircrafts fly in environments with high concentrations of sand, dust, and other particles, the engines will inhale a large number of these particles. After entering the aero engine, these particles undergo heating in the combustion chamber and then interact with the turbine vanes in a molten or solid-state, depositing on the surface of the turbine vanes. This affects the aerodynamic and heat transfer characteristics of the turbine vanes and may even block the film cooling holes, leading to the erosion of the turbine vanes and accordingly a flight accidents.rnCurrently, film cooling is used on most high-performance turbine vanes to protect the vanes from heat. However, the presence of film cooling causes interference between the mainstream and cooling flows, which seriously affects the deposition characteristics of particles on the vane surface. Changes in the film cooling hole shape not only affect the cooling efficiency of the vane but also the flow field structure behind the film cooling hole, which in turn affects the movement and heat transfer of particles in the flow field, leading to changes in the amount and distribution of particle deposition on the vane surface. This paper conducts experimental studies on the deposition of particles on flat surfaces with different film cooling hole shapes near ambient temperature conditions, and explores the influence of different film cooling hole shapes on the particles deposition, providing reference for the design of film cooling holes for turbine vane to reduce the deposition.rnThe experimental system applied by Liu et al and consists of the wind tunnel, the wax spray system and the cooling air system, however, the last of which is revised. Atomized wax is used for simulating the particles in harsh environments, and the film-cooled flat plate serves as the test model. The wax deposition on the flat plate surface simulates the deposition of particles on the actual turbine blade surface. The airflow in the w