Transactions of Nanjing University of Aeronautics & Astronautics
Research on Accessibility Factors of Metal Particles and Structural Optimization of Intermediate Gearbox in a Helicopter
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Abstract:
The intermediate gearbox of a helicopter operates under splash lubrication. If the bearing produces metal particles due to insufficient lubrication or wear， whether it can be adsorbed by the metal particles signal at the bottom of the gearbox and alarm directly affects the flight safety of the helicopter. Based on the CFD method， the factors affecting the accessibility of metal particles are analyzed by using the volume of fluid-discrete phase model（VOF-DPM） coupling model， the RNG k-? turbulence model and the dynamic grid technology. Furthermore， the optimization research on the casing structure is conducted. Experimental results show that the accessibility of metal particles is optimal when the gear speed is 6 000 rad/min or the immersion depth is 24 mm. The density of metal particles exhibits a nonlinear relationship with their accessibility， and the particle size has a relatively small impact on their accessibility without an order of magnitude change.
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Project Supported:
This study was supported by the National Natural Science Foundation of China（No.52075241）， and the National Key Laboratory of Science and Technology on Helicopter Transmission （Nanjing University of Aeronautics and Astronautics） （Nos.HTL-A-22K04 and HTL-O-21G13）.
Clc Number:
TH132.46
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