School of Aerospace Engineering MITE Computational Analysis of Computational Analysis of Stall and Separation Stall and Separation Control in Control in Compressors Compressors Lakshmi Sankar Saeid Niazi, Alexander Stein School of Aerospace Engineering Georgia Institute of Technology Supported by the U.S. Army Research Office Under the Multidisciplinary University Research Initiative (MURI) on Intelligent Turbine Engines
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School of Aerospace Engineering MITE Computational Analysis of Stall and Separation Control in Compressors Lakshmi Sankar Saeid Niazi, Alexander Stein.
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School of Aerospace Engineering
MITE
Computational Analysis of Stall and Computational Analysis of Stall and Separation Control in Separation Control in
CompressorsCompressors
Lakshmi SankarSaeid Niazi, Alexander Stein
School of Aerospace EngineeringGeorgia Institute of Technology
Supported by the U.S. Army Research Office Under the Multidisciplinary University Research Initiative (MURI) on Intelligent Turbine Engines
School of Aerospace Engineering
MITE
Motivation and ObjectivesMotivation and Objectives• Use CFD to explore and
understand compressor stall and surge
• Develop and test flow control strategies (air-injection, bleeding) for compressors
• Apply CFD to compare low-speed and high-speed configurations
Compressor instabilities can cause fatigue and damage to entire engine
School of Aerospace Engineering
MITE
Summary of Earlier AccomplishmentsSummary of Earlier Accomplishments
• 2-D rotating stall was numerically modeled, and the underlying physical phenomena studied
• A 3-D flow solver capable of modeling unsteady viscous flow through axial and centrifugal compressors was developed and validated
• The mechanisms behind the onset and growth of surge in NASA Low Speed Centrifugal Compressor was studied
• Control of Surge through diffuser bleed was simulated
• Development of surge mechanism in centrifugal compressors was studied. Surge Control through upstream injection was optimized
• In preparation for rotating stall simulations, a multi-blade passage version of the solver was developed and validated
School of Aerospace Engineering
MITE
Future and Planned ActivitiesFuture and Planned Activities
• 3-D rotating stall phenomenon and efficient stall control in axial compressors (bleeding, vortex generators) will be modeled
• Develop a criterion for efficient injection control of centrifugal compressors
• Examine the effectiveness of control laws developed by Drs. Haddad, Prasad and Neumeier through CFD-simulations
School of Aerospace Engineering
MITE
Technology Transition• The suite of codes may be used by industry partners
for pilot studies of promising concepts:• Compact size of the code• Optimized for turbomachinery applications• Advanced analysis features (fifth order Roe solver, implicit
time marching algorithm, Spalart-Allmaras model) • Documentation is available
• Optimized injection control scheme may be implemented in real engines: