Laser surface profilometer and infra-red camera for in-situ studies of surface deposition in high-enthalpy, particle-laden flows.
Abstract
The purpose of this action is to add FY22 UFR funds in the amount of $76,132.00 for GRANT#13614977.-Material surfaces exposed to high-speed, particle-laden flows are subject to irreversible damage resulting from erosion and particle accumulation. Such flows occur frequently in gas turbine engines-onboard helicopters and tilt-rotor aircraft operating in sandy and dusty environments. At high temperatures, deposition of molten particles on engine components such as turbine blades, makes them susceptible to failure while reducing part lifespan resulting in significantly higher maintenance costs. Surface deposition of particles and its subsequent accumulation critically depends on-local particle and fluid dynamics, and the nature of the particle-surface interaction process. Subsequent failure mechanisms can be linked to changes in heat transfer linked to particle accumulation impacting blade cooling characteristics. DURIP funds are requested to purchase two non-intrusive diagnostics, a 3D laser surface profilometer, and an infra-red camera to acquire localized, in-situ measurements of particle deposition and associated changes in heat transfer for a turbine blade exposed to particle-laden flow. These two diagnostics will be implemented in a unique multiphase turbine test rig at LSU, capable of generating particle-laden gas flows with controlled loading over a turbine blade at engine-relevant operating conditions. An existing stationary hot cascade facility at LSU, which can generate high temperature (1500 deg F), high pressure (10 bar), transonic flow over turbine airfoil blade sections, has been modified to generate particle-laden flow. Low melting point glass powder with controlled loading will be injected into high temperature, combustion-generated exhaust to produce multiphase flow with molten particulate matter. The laser line scanner to be purchased using DURIP funds will be used to acquire time-resolved, 3D-surface topology of the turbine blade during deposition tests. Surface temperature measurements acquired using the infra-red camera to be purchased using DURIP funds, will be used with heat flux measurements to characterize heat transfer changes resulting from particle deposition. The test rig, once instrumented with DURIP-funded non-intrusive diagnostics, will be used for fundamental studies focusing on fluid-structure coupling processes during molten particle deposition. Deposition measurements acquired using laser line scanning will be correlated to localized flow field behavior, test conditions, and particle properties. Changes in blade heat flux will be correlated to particle deposition thickness and blockage of film-cooling holes. An augmented film cooling approach to mitigate particle deposition will be studied. Longer term, the research facility will provide unique testing capabilities for technologies that can enhance operational performance and safety of DoD propulsion systems. This includes sand-phobic thermal barrier coatings, active flow control, and sand and dust sensing strategies. Further, acquisition of the proposed nonintrusive diagnostics and their implementation in the test facility will train future scientists and engineers for careers in propulsion and high-speed flows, which form a core aspect of many DoD missions.--
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- May 15, 2023
- Source ID
- N000142312428
Entities
People
- Shyam Menon
Organizations
- Louisiana State University
- Office of Naval Research
- United States Navy