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Use of pressure sensitive paint for diagnostics in turbomachinery flows with shocks
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Bencic, Timothy J. Lepicovsky, Jan |
| Copyright Year | 2001 |
| Description | The technology of pressure sensitive paint (PSP) is well established in external aerodynamics. In internal flows in narrow channels and in turbomachinery cascades, however, there are still unresolved problems. In particular, the internal flows with complex shock structures inside highly curved channels present a challenge. It is not always easy and straightforward to distinguish between true signals and "ghost" images due to multiple internal reflections in narrow channels. To address some of the problems, investigations were first carried out in a narrow supersonic channel of Mach number 2.5. A single wedge or a combination of two wedges were used to generate a complex shock wave structure in the flow. The experience gained in a small supersonic channel was used for surface pressure measurements on the stator vane of a supersonic throughflow fan. The experimental results for several fan operating conditions are shown in a concise form, including performance map points, midspan static tap pressure distributions, and vane suction side pressure fields. Finally, the PSP technique was used in the NASA transonic flutter cascade to compliment flow visualization data and to acquire backwall pressure fields to assess the cascade flow periodicity. A summary of shortcomings of the pressure sensitive paint technology for internal flow application and lessons learned are presented in the conclusion of the paper. |
| File Size | 856787 |
| Page Count | 14 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20020011685 |
| Archival Resource Key | ark:/13960/t6qz76163 |
| Language | English |
| Publisher Date | 2001-11-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Propulsion And Power Shock Waves Internal Flow Supersonic Speed Flow Visualization Pressure Distribution Pressure Sensitive Paints Turbomachinery Pressure Measurement Wedges Transonic Flutter Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
