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Short-term performance deterioration in jt9d-7a(sp) engine 695743
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Sallee, G. P. Bouchard, R. J. Beyerly, W. R. |
| Copyright Year | 1978 |
| Description | The level of performance deterioration that occurred during early service was studied and also the contribution of each engine module to the overall level of engine performance deterioration. To assist in the distribution of the performance losses to the module level, testing with expanded experimental instrumentation was accomplished to permit direct measurement of module performance. An analytical teardown of the engine was accomplished to permit assignment of module performance losses to individual mechanical damage mechanisms including blade and seal wear, roughness, and thermal distortion of turbine parts. The results of the testing show that the engine deteriorated 1.5 percent in thrust specific fuel consumption from its performance when new. Initial testing, which included water washing, showed that 0.2 percent in performance deterioration was due to surface contamination (dirt) and 0.1 percent was due to drift of the engine vane control system, leaving 1.2 percent in basic TSFC deterioration. This 1.2 percent TSFC loss was distributed among the engine modules with 0.6 percent caused by clearance changes, 0.4 percent loss due to thermal distortion, and 0.2 percent loss due to increased roughness of the fan and low-pressure compressor airfoils. |
| File Size | 201160827 |
| Page Count | 237 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19780022178 |
| Archival Resource Key | ark:/13960/t3712vp9j |
| Language | English |
| Publisher Date | 1978-06-30 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Propulsion And Power Degradation Performance Tests Boeing 747 Aircraft Energy Dissipation Modules Dirt Turbofan Engines Commercial Aircraft Sealing Flight Simulation 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 |
