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| Analyzing performance parameters of upstream pumping mechanical seals based on dynamic mesh technique |
| CHEN Hui-Long, LIU Yu-Hui, LIU Tong, WANG Qiang, LIU Zhi-Bin, ZHANG Jia-Bin |
| (School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China) |
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Abstract In order to get an accurate liquid film thickness of an upstream pumping mechanical seal, a model of 3D flow domain of the seals with spiral grooves was generated by using Pro/E wildfire. The flow field in the microgap of the seals with spiral grooved faces was simulated with CFD code Fluent using the dynamic mesh and cavitation model. Liquid film thicknesses under different working conditions were obtained and compared with the experiments to verify the simulated results. And effects of working condition parameters on the stiffness and leakage of liquid film were calculated and analyzed. The results showed that the simulated liquid film thicknesses is basically consistent with the experiments (the maximum, average and minimum errors are 19.6%, 8% and 0), verifying the dynamic mesh technique is feasible for simulating flow field in the gap of a mechanical seal. Also the cavitation problem should be considered in such simulations to obtain real characteristics of the flow field. The thickness, leakage and rigidity of liquid film increase with increasing rotational speed, medium pressure. Further the spiral grooves not only produce a pumping effect, but also generate a dynamic pressure effect.
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Received: 26 March 2012
Published: 30 September 2012
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