| Laminar-Turbulent Transition in High-Speed Compressible Boundary Layers:Continuation of Elliptic-Cone Experiments |
31 JAN 2000 |
9 pages |
| Authors:
Steven P. Schneider; Steven H. Collicott; PURDUE UNIV LAFAYETTE IN SCHOOL OF AERONAUTICS AND ASTRONAUTICS
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 | This grant supported experimental research into high-speed laminar- turbulent transition. While it began as a one-year effort extending our earlier work on elliptic cones, it became increasingly evident that the low quiet Reynolds number available in the Mach-4 quiet Ludwieg tube was limiting the usefulness of the measurements. Although useful results for instability and transition were nevertheless obtained, the emphasis shifted toward development of ... |
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| Modeling Primary Atomization Processes |
01 FEB 1999 |
127 pages |
| Authors:
Stephen D. Heister; PURDUE UNIV LAFAYETTE IN SCHOOL OF AERONAUTICS AND ASTRONAUTICS
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| The contributions of atomization processes to combustion instabilities in liquid rocket engines has been assessed via a series of analytic/numerical models. Simulations of high-speed injection of a viscous jet have revealed a jet "swelling" phenomenon for the first time. Modeling of F-1 fuel injectors reveals a potential instability of the fuel columns to transverse acoustic modes in injector designs which showed large instabilities. Limited ... |
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| Analysis of Widespread Fatigue Damage in Aerospace Structures |
FEB 1999 |
158 pages |
| Authors:
A. F. Grandt Jr.; T. N. Farris; B. H. Hillberry; PURDUE UNIV LAFAYETTE IN SCHOOL OF AERONAUTICS AND ASTRONAUTICS
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| This report summarizes research dealing with analyzing the effects of widespread fatigue damage on aircraft structural integrity. Results are described for determining how cracks nucleate by corrosion, fatigue, or fretting fatigue, and once formed, grow, coalesce and lead to final fracture. The research is conducted in the context of the aging aircraft issue, which focuses on determining procedures for ensuring the continued safety of aircraft that ... |
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| Flutter Control of Wing Boxes Using Piezoelectric Actuators |
AUG 1994 |
62 pages |
| Authors:
Edwin E. Forster; PURDUE UNIV LAFAYETTE IN SCHOOL OF AERONAUTICS AND ASTRONAUTICS
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| This paper examines the use of piezoelectric actuators to control supersonic flutter of wing boxes. Aluminum built-up wing boxes are used as examples to analyze the free vibration, aeroelastic, and control concepts associated with flutter control. Finite elements are used to calculate deflections due to input forces, the member stresses and strains, natural frequencies, and mode shapes. Linear strip theory with steady aerodynamics are ... |
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