Session: 01-01: Aero-engine Operation in Harsh Environments

Submission Number: 178854

The Particles Deposition on a Plate due to an Unsteady Sweeping Cooling Jet 

Particles may be carried into gas turbine engines, when they work in an environment with high concentration of particles, such as sands and dusts. In this case, the particles may deposit on the turbine vanes and blades, which changes the geometrical profile of the turbine vanes and blades and increases their surface roughness, usually reducing the aerodynamic and cooling performance of the turbine. The worst is that the particles deposition may clog the film cooling holes and make the turbine burnout in a short time. In recent years, due to the significant improvement in cooling efficiency demonstrated by sweeping jet film cooling technology, the application of fluid oscillators that can stably provide self-excited unsteady sweeping jets from the film cooling holes has been attracting increasing attention. The particles deposition may alter the flow structure near the film cooling holes and the unsteady sweeping jets could also change the particle deposition characteristics. Therefore, it becomes necessary to study how the particles deposition forms due to the unsteady sweeping jets. In this study, the numerical simulation based on Lagrangian-Eulerian method with the SST k-ω turbulence model is conducted to study the particles deposition characteristics on a flat plate with the film cooling due to the unsteady sweeping jet generated by a Coanda sweeping fluid oscillator. Numerical analysis shows that compared with the steady jet film cooling system, the unsteady sweeping jet film cooling system has a wider coverage area of the film cooling air and the cooling effectiveness is improved. Moreover, the unsteady sweeping cooling jet makes it difficult for particles to adhere to the surface of the plate and also makes the deposition more unform in the transverse direction of the plate, which means that it has an inhibitory effect on the particles deposition and decreases the negative influence on the cooling performance of the plate due to the particles deposition.

Presenting Author: Zhen Tan Northwestern Polytechnical University

Presenting Author Biography: Mr. Zhen Tan graduated from Northwestern Polytechnical University and obtained his bachelor degree in June 2024. Then he perused his study as graduate student in Northwestern Polytechnical University in September 2024. Currently, he focuses on the particles deposition on turbine vanes and blades, and its harms on turbine. He is also interested in the optimization of cooling configuration to reduce the negative effect of the particles deposition on turbine.

Authors:

Zhengang Liu Northwestern Polytechnical University
Zhen Tan Northwestern Polytechnical University
Junyu Zha Northwestern Polytechnical University