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Despite intensive work spanning five decades, the problem of oscillatory behavior of high-energy propulsion systems and industrial burners is still an important engineering problem. Current mathematical and computational tools in widespread use have failed to yield reliable techniques for predicting and controlling such problems. It is imperative that correct procedures be implemented, since combustion instability problems usually appear late in the development cycle resulting in large, unexpected expenditures and delays in schedule.
New research has resulted in sharpened physical understanding, better diagnostic techniques, and improved predictive computational algorithms. This course will present a detailed and balanced coverage of the theory of combustion instability and the means to implement it in the design process. Emphasis will be on new findings including the effects of vorticity and other flowfield interactions not incorporated in the classical theories and computational tools. These will be discussed in detail along with a full treatment of established viewpoints including effects of flowturning, velocity coupling, and distributed combustion effects. New techniques will be introduced that greatly improve the modal analysis procedures needed in identifying acoustic mode shapes and frequencies in complex system configurations. The course will also include comprehensive treatment of vortex shedding, effects of nonlinear interactions, and new methods for controlling combustion instabilities.
Attendees will receive a comprehensive literature package and text material by Yang and Flandro covering all aspects of the course. These will be distributed in either CD or DVD format. Tables of experimental data and other visual supportive material and viewgraphs will be included. Latest versions of predictive algorithms will be demonstrated. A practical problem solving session will be held to enable the attendees some hands on experience in solving realistic combustion instability problems.
Dr. Gary A. Flandro is Boling Chair Professor of Mechanical Engineering at UTSI. He has devoted almost four decades to the study of oscillatory flow phenomena. He received his PhD from Caltech.
Dr. Vigor Yang is Professor of Mechanical Engineering at Penn State University. He has pioneered the application of numerical methods in the solution of unsteady internal flows with combustion. He has developed new algorithms that clarify the coupling of acoustic/shear waves to combustion. He also received his PhD from Caltech.
Dr. Fred S. Blomshield is head, Propulsion Research Branch at the Naval Air Warfare Center, China Lake, CA. He is an expert in experimental methods and their application in combustion instability testing especially in nonlinear systems.
Dr. Jonathan French is an analyst at Software & Engineering Associates, Inc., Carson City, NV. He is currently developing improved versions of the standard combustion instability prediction algorithms (SSPP) that are universally used in solving combustion stability problems. He received his Ph.D. degree from UTSI.
Instructor: G. A. Flandro (UTSI)
7:45 Registration – UTSI Lobby
8:10 Welcome (COO, UTSI)
8:20 Introduction
8:45 History of Combustion Stability Research
10:00 Break
10:15 Current Issues and Approach
10:45 Combustion Stability as a System Problem
12:00 Lunch
1:00 Analysis of Combustor Stability: Classical
Approach
2:30 Break
2:45 Stability Problems in Liquid Rockets
3:30 Nonlinear Combustion Instability
4:30 Adjourn
Instructors: G. Flandro (UTSI), J. French (SEA), and V. Yang (Penn
State)
8:00 Prediction and Diagnosis of Combustion Instability
9:00 The Standard Stability Prediction Method
10:00 Break
10:15 Case Studies: Industrial Burners, Saturn F1, Lunar Descent
Engine, Shuttle SRM, Ariane Booster, MMII, various tactical motor
systems, and many others
12:00 Lunch
1:00 Modeling of Flow/Combustion Interactions
2:30 Break
2:45 Numerical Modeling of Unsteady Reacting Flows
4:30 Adjourn
Instructors: G. Flandro (UTSI) and V. Yang (Penn State)
8:00 Nonlinear Effects – Triggering, Limit Cycles, D.C. Shift and
Steepfronted waves
10:00 Break
10:15 Modeling of the Combustion Zone – Admittance Approach
12:00 Lunch
1:00 Nonlinear Effects in Liquid Motor Instability
2:00 Corrective Procedures
3:00 Active Control of Instabilities
4:30 Adjourn
Instructor: F. Blomshield (NAWC)
8:00 Tour of AEDC Test Facilities
12:00 Lunch
1:00 Experimental Methods in Combustion Stability Problems
2:00 Response Function Testing
2:30 Break
2:45 Modern Instrumentation Approach and Data Acquisition and Processing
3:30 Pulsed Combustor Testing
4:00 Novel Experimental Techniques (X-Ray, Laser, Microwave, etc.)
4:30 Adjourn