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Follow-on low noise fan aerodynamic study
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Hall, Edward J. Delaney, Robert A. Heidegger, Nathan J. |
| Copyright Year | 1999 |
| Description | The focus of the project was to investigate the effects of turbulence models on the prediction of rotor wake structures. The Advanced Ducted Propfan Analysis (ADPAC) code was modified through the incorporation of the Spalart-Allmaras one-equation turbulence model. Suitable test cases were solved numerically using ADPAC employing the Spalart-Allmaras turbulence model and another prediction code for comparison. A near-wall spacing study was also completed to determine the adequate spacing of the first computational cell off the wall. Solutions were also collected using two versions of the algebraic Baldwin-Lomax turbulence model in ADPAC. The effects of the turbulence model on the rotor wake definition was examined by obtaining ADPAC solutions for the Low Noise Fan rotor-only steady-flow case using the standard algebraic Baldwin-Lomax turbulence model, a modified version of the Baldwin-Lomax turbulence model and the one-equation Spalart-Allmaras turbulence model. The results from the three different turbulence modeling techniques were compared with each other and the available experimental data. These results include overall rotor performance, spanwise exit profiles, and contours of axial velocity taken along constant axial locations and along blade-to-blade surfaces. Wake characterizations were also performed on the experimental and ADPAC predicted results including the definition of a wake correlation function. Correlations were evaluated for wake width and wake depth. Similarity profiles of the wake shape were also compared between all numerical solutions and experimental data. |
| File Size | 5595321 |
| Page Count | 148 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19990092371 |
| Archival Resource Key | ark:/13960/t4pk5b40s |
| Language | English |
| Publisher Date | 1999-02-01 |
| Access Restriction | Open |
| Subject Keyword | Aerodynamics Baldwin-lomax Turbulence Model Rotor Aerodynamics Aerodynamic Noise Computerized Simulation Fan Blades Program Verification Computers Discretization Mathematics Navier-stokes Equation Rotor Dynamics Rotor Blades Turbomachinery Turbulence Models Wakes Turbulence Effects Mathematical Models Applications Programs Computers Grid Generation Mathematics Axial Flow Linearization Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
