Abstract
Based on the theory of computational fluid dynamics (CFD), with the help of the Fluent software and the powerful parallel computing capability of the super cloud computer, the single-phase flow transient simulation calculation of the windage power loss of the engagement spiral bevel gear pair (SBGP) was performed. The two-equation SST k-ω turbulence model based on the assumption of eddy viscosity was adopted, which was improved from the standard k-ε model combined with the Wilcox k-ω model. The SST k-ω turbulence model inherited the respective advantages of the Wilcox k-ω model in the near-wall region and the k-ε model in the free shear layer and could more accurately describe the resistance and separation effect of the gear tooth surface on the airflow. The simulation analyzed the airflow characteristics around SBGP and the mechanism of the windshield to reduce the windage loss of the gear. It also studied the influence of the windshield clearance and opening size on the windage power loss. Then the orthogonal experimental analysis method was adopted to perform numerical simulation analysis. The windage torque was studied under different clearance values between the windshield and the gear tooth surface, as well as the large end and the small end. The variance analysis was performed on the numerical simulation data. The results showed that when the windshield clearance value was 1 mm and the engagement opening was 30°, the windage torque was the smallest, and the effect of reducing the windage power loss was the best. According to the changes in the pressure, velocity, and turbulent kinetic energy cloud diagram of the flow field in the reducer during multi-group simulation tests, the local optimal windshield configuration was obtained, which provided a method for further research on the multi-objective optimization of the windshield and the windage loss of the gear pair under the oil–gas two-phase flow and also provided a reference for the practical engineering application of the windshield.
Highlights
The results showed that blocking the radial entrance of the gear slot could reduce the windage power loss by 22% to 44%; shielding the gear with a windshield could significantly reduce the windage loss [6]
The results showed that the windshield could reduce the windage power consumption by about 70%, and the characteristics of the spiral bevel gear were similar to the centrifugal fan in many ways
The backlash of the gear pair is small, andsmall, whenand thewhen dynamic mesh technology is usedisfor mesh reconstruction, the extremely the dynamic mesh technology used for mesh reconstruction, engagement area is very likely to form a negative volume, which leads to calculation the engagement area is very likely to form a negative volume, which leads to calculation errors
Summary
Winfree [8] installed a single spiral bevel gear with a windshield on a test bench and conducted experimental analyses on its windage power loss. The windage characteristics of a single spiral bevel gear under different windshield configurations were studied to optimize the effect of the windshield on the windage power loss. CFD to study the influence of windshields with different geometric characteristics on the single-phase fluid of spiral bevel gears. Webb [15,16] employed CFD to simulate the windage loss of the single gear with the windshield in the single-phase flow He pointed out that as the number of teeth increased, the non-dimensional torque coefficient decreased. This paper performed transient simulation calculations on the windage power loss of SBGP It studied the mechanism of the windshield to reduce the windage.
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