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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Weber, Stefan Max, F. Platzer |
| Copyright Year | 2000 |
| Abstract | Numerical stall flutter prediction methods are highly needed as modern jet engines require blade designs close to the stability boundaries of the performance map. A Quasi-3D Navier-Stokes code is used to analyze the flow over the oscillating cascade designed and manufactured by Pratt & Whitney, and studied at the NASA Glenn Research Center by Buffum et al. The numerical method solves for the governing equations with a fully implicit time-marching technique in a single passage by making use of a direct-store, periodic boundary condition. For turbulence modeling the Baldwin-Lomax model is used. To account for transition, the criterion to predict the onset location suggested by Baldwin and Lomax is incorporated. Buffum et al. investigated two incidence cases for three different Mach numbers. The low-incidence case at a Mach number of 0.5 exhibited the formation of small separation bubbles at reduced oscillation frequencies of 0.8 and 1.2. For this case the present approach yielded good agreement with the steady and oscillatory measurements. At high-incidence at the same Mach number of 0.5 the measured steady-state pressure distribution and the separation bubble on the upper surface was also found in good agreement with the experiment. But computations for oscillations at high-incidence failed to predict the negative damping contribution caused by the leading edge separation. |
| Sponsorship | International Gas Turbine Institute |
| File Format | |
| ISBN | 9780791878576 |
| DOI | 10.1115/2000-GT-0385 |
| Volume Number | Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education |
| Conference Proceedings | ASME Turbo Expo 2000: Power for Land, Sea, and Air |
| Language | English |
| Publisher Date | 2000-05-08 |
| Publisher Place | Munich, Germany |
| Access Restriction | Subscribed |
| Subject Keyword | Damping Turbulence Stability Blades Cascades (fluid dynamics) Nasa Oscillations Separation (technology) Flow (dynamics) Modeling Pressure Steady state Jet engines Bubbles Numerical analysis Computation Flutter (aerodynamics) Boundary-value problems Mach number |
| Content Type | Text |
| Resource Type | Article |
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