Study on Traction Characteristics of Point Contact State under Oil–Air Lubrication
Abstract
:1. Introduction
2. Oil–Air Lubrication Traction Test
2.1. Test Apparatus
2.2. Test Scheme
3. Oil–Air Lubrication Flow Field Simulation
3.1. Multiphase Flow Model and Governing Equation
3.2. Oil–Air Lubrication Flow Field Calculation Domain Model
4. Traction Test and Simulation Result
4.1. The Quantitative Valve Is 0.05 mL/Time
4.2. The Quantitative Valve Is 0.2 mL/Time
4.3. Comparison between Experimental Results and Simulation Results
5. Analysis of the Four-Parameter Exponential Model
6. Conclusions
- (1)
- The traction characteristics of oil–air lubrication were tested under different quantitative valve working conditions of 1.5 mL/min and 6 mL/min using the traction power testing machine. The curve of the traction coefficient varying with the slip–roll ratio was obtained. The experimental results show that under the condition of 12 m/s air-speed, the traction coefficient of 6 mL/min oil supply is smaller than that of 1.5 mL/min oil supply. When the entrainment speed is constant, the traction coefficient increases with the increase of the load. When the load is constant, the traction coefficient decreases with the increase of entrainment speed.
- (2)
- The oil–air lubrication flow field simulation model was established, and the oil supply conditions of 1.5 mL/min and 6 mL/min were simulated and analyzed. With the increase of entrainment speed, the oil volume fraction on the spherical surface of the contact region also increases. Furthermore, under the oil supply condition of 6 mL/min, the oil volume fraction on the spherical surface of the contact region exceeds that observed at 1.5 mL/min.
- (3)
- Fluid simulation analysis is closely related to the results of the traction test. When the slip–roll ratio is 0.1, the traction coefficient shows a downward trend with the change of the entrainment speed from 2 to 8 m/s, and the volume fraction of lubricating oil on the spherical surface of the contact area gradually increases.
- (4)
- The four-parameter exponential model was used for the fitting analysis of the test data, and it was found that the theoretically predicted value of the four-parameter exponential model was in good agreement with the experimental value, and the fitting accuracy was above 0.95.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Condition Parameter | Symbol | Range of Value |
---|---|---|
Entrainment speed of ball and disk contact area | 1~50 m/s | |
Speed range of electric spindle I | 0~48,000 r/min | |
Speed range of electric spindle II | 0~24,000 r/min | |
Test temperature range | T | −175~150 °C |
Slip–roll ratio range | S | 0~0.35 |
Loading range | W1 | 0~500 N |
Hertz contact stress range | W2 | 0~3.5 GPa |
Phase | Parameter | Density | Dynamic Viscosity |
---|---|---|---|
air | 12 m/s | 1.128 kg/m3 | 1.7894 10−2 mPa·s |
oil | 1.2 (6.0) mL/min | 865 kg/m3 | 4.325 mPa·s |
Working Condition N-m/s | A | B | C | D | Residual Standard Deviation | Determination Coefficient |
---|---|---|---|---|---|---|
80-2 | −0.0498 | −0.0001 | 44.1272 | 0.051 | 0.0009 | 0.9982 |
100-2 | −0.0539 | −0.001 | 50.6598 | 0.0551 | 0.0011 | 0.9979 |
120-2 | −0.0583 | 0 | 55.5239 | 0.0589 | 0.0008 | 0.9989 |
140-2 | −0.0634 | 0.5096 | 50.1188 | 0.0638 | 0.0006 | 0.9994 |
80-4 | −0.0481 | 0.2968 | 36.0932 | 0.0489 | 0.009 | 0.9982 |
100-4 | −0.051 | 0 | 49.1317 | 0.0518 | 0.0008 | 0.9988 |
120-4 | −0.0554 | 0.682 | 39.819 | 0.0557 | 0.0005 | 0.9995 |
140-4 | −0.0611 | 0.4426 | 54.5941 | 0.0609 | 0.0008 | 0.9991 |
80-6 | −0.0451 | 0 | 41.4334 | 0.0457 | 0.0007 | 0.9989 |
100-6 | −0.0484 | 0.0001 | 47.4736 | 0.049 | 0.0008 | 0.9985 |
120-6 | −0.0523 | 0.7195 | 36.8474 | 0.0522 | 0.0005 | 0.9995 |
140-6 | −0.0566 | 0.7457 | 45.6521 | 0.0566 | 0.0002 | 0.9999 |
80-8 | −0.0423 | 0.4791 | 24.6241 | 0.0425 | 0.0004 | 0.9997 |
100-8 | −0.0459 | −0.0001 | 41.8755 | 0.0466 | 0.0005 | 0.9994 |
120-8 | −0.0495 | 0.3292 | 39.7291 | 0.0498 | 0.0005 | 0.9993 |
140-8 | 0.0529 | 0 | 53.4028 | 0.0533 | 0.0004 | 0.9997 |
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Su, B.; Li, H.; Ren, J.; Gong, Z. Study on Traction Characteristics of Point Contact State under Oil–Air Lubrication. Lubricants 2024, 12, 299. https://doi.org/10.3390/lubricants12090299
Su B, Li H, Ren J, Gong Z. Study on Traction Characteristics of Point Contact State under Oil–Air Lubrication. Lubricants. 2024; 12(9):299. https://doi.org/10.3390/lubricants12090299
Chicago/Turabian StyleSu, Bing, Han Li, Jiongli Ren, and Zeyu Gong. 2024. "Study on Traction Characteristics of Point Contact State under Oil–Air Lubrication" Lubricants 12, no. 9: 299. https://doi.org/10.3390/lubricants12090299