Classification and Modeling of Fluid Dynamic Loss in Aeroengine Transmission Gears
| Autor: | Hirofumi Akahori, Hidenori Arisawa, Tatsuhiko Goi, Mitsuaki Tanaka, Mamoru Yoshitomi, Yuji Shinoda |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Momentum (technical analysis) 020209 energy Mechanical Engineering Energy Engineering and Power Technology Aerospace Engineering 02 engineering and technology Mechanics Dissipation Vortex Physics::Fluid Dynamics Fuel Technology Nuclear Energy and Engineering Transmission (telecommunications) 0202 electrical engineering electronic engineering information engineering |
| Zdroj: | Journal of Engineering for Gas Turbines and Power. 141 |
| ISSN: | 1528-8919 0742-4795 |
| DOI: | 10.1115/1.4042509 |
| Popis: | Reducing the fluid dynamic power loss for increasing speed is critical for the development of highly efficient high-speed aircraft engine gearing. In this study, the fluid dynamic loss was experimentally performed using a precise friction loss management technique along a vacuum being drawn on the gearbox. The experimental fluid dynamic loss could be classified as either “oil jet acceleration loss and oil reacceleration loss based on the conservation law of momentum for a point mass” or “oil churning loss and windage loss based on the conservation law of momentum for an incompressible continuum.” Windage loss and oil dynamic loss (i.e., the summation of oil jet acceleration loss, oil reacceleration loss, and oil churning loss) were modeled to develop equations for a loss prediction. The equations of the windage loss are pressure loss of flow passing through the side clearance of the gears and energy loss caused by the vortex generation in the cavity between tooth valleys. Oil dynamic loss was determined by multiplying the oil jet acceleration loss by an empirical coefficient. The results of the loss prediction equations agree with the experimental results, demonstrating the validity of the proposed model of the fluid dynamic loss. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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