Loading...
Please wait, while we are loading the content...
Similar Documents
Heat transfer on a film-cooled rotating blade
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Garg, Vijay K. |
| Copyright Year | 1999 |
| Description | A multi-block, three-dimensional Navier-Stokes code has been used to compute heat transfer coefficient on the blade, hub and shroud for a rotating high-pressure turbine blade with 172 film-cooling holes in eight rows. Film cooling effectiveness is also computed on the adiabatic blade. Wilcox's k-omega model is used for modeling the turbulence. Of the eight rows of holes, three are staggered on the shower-head with compound-angled holes. With so many holes on the blade it was somewhat of a challenge to get a good quality grid on and around the blade and in the tip clearance region. The final multi-block grid consists of 4784 elementary blocks which were merged into 276 super blocks. The viscous grid has over 2.2 million cells. Each hole exit, in its true oval shape, has 80 cells within it so that coolant velocity, temperature, k and omega distributions can be specified at these hole exits. It is found that for the given parameters, heat transfer coefficient on the cooled, isothermal blade is highest in the leading edge region and in the tip region. Also, the effectiveness over the cooled, adiabatic blade is the lowest in these regions. Results for an uncooled blade are also shown, providing a direct comparison with those for the cooled blade. Also, the heat transfer coefficient is much higher on the shroud as compared to that on the hub for both the cooled and the uncooled cases. |
| File Size | 872346 |
| Page Count | 14 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19990097987 |
| Archival Resource Key | ark:/13960/t0rr6sd68 |
| Language | English |
| Publisher Date | 1999-07-01 |
| Access Restriction | Open |
| Subject Keyword | Fluid Mechanics And Heat Transfer Blade Tips Turbulent Flow Turbine Blades Hole Distribution Mechanics Computational Fluid Dynamics Shrouds Pressure Distribution High Pressure Navier-stokes Equation Multiblock Grids K-omega Turbulence Model Film Cooling Hubs Heat Transfer Coefficients Three Dimensional Models Leading Edges Heat Transfer Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
