This currently presented work is an evaluation of the characteristics of different cooling hole geometries to particulate ingestion clogging. Experimentation was conducted using a premixed bluff body flame combustor facility to generate high temperature combustor flow conditions. Sand ingestion along the cooling path of the combustion liner was reproduced using an air-assisted seeder providing consistent sand ingestion. Mass flow rate of cooling air was controlled using a sonic orifice downstream of a pressure regulator so that the mass flow rate of the air and sand mixture is independent of the clogging state. Pressure data upstream of a small section of a combustion liner was recorded to quantify the clogging of the different combustion liner cooling geometries over time. Several geometries were tested including 3 "S" shaped slots with varying width and length, along with tapered straight slots, and compared to the traditional straight round hole. It was found that a diverging orientation of the tapered slot had the most promising performance mitigating particulate deposition. The displacement boundary layer growth interaction with the main flow within the diverging section of the slot is discussed as the main contributing factor to resist clogging. The use of such a clogging-resistant combustion liner could drastically reduce the maintenance necessary for vehicles operating in sandy and dusty environments, reducing the overall operational cost, and lowering risks of complete failure of the aircraft propulsion system.
Master of Science in Aerospace Engineering (M.S.A.E.)
College of Engineering and Computer Science
Mechanical and Aerospace Engineering
Aerospace Engineering; Thermofluid Aerodynamic Systems
Length of Campus-only Access
Masters Thesis (Open Access)
Padilla, Nelson, "Sensitivity of Combustion Liner Contour to Sand Ingestion Clogging" (2022). Electronic Theses and Dissertations, 2020-. 1265.