Thermo-Hydrodynamic Analysis of Low-Temperature Supercritical Helium Spiral-Grooved Face Seals: Large Ambient Temperature Gradient
Source abstract
Abstract
Hhighly efficient and reliable sealing technology is essential to improve the efficiency of precooled aeroengines. To explore the effects of large ambient temperature gradients on the sealing performance, the thermo-hydrodynamic characteristics of a supercritical helium spiral-grooved face seal were studied numerically, under low-temperature conditions. Considering the real gas effect of helium, the thermal deformations of the seal were analyzed numerically, under different temperature gradients. Additionally, the distributions of the pressure, temperature, and film thickness of the gas film were calculated, and the sealing performances of the seal under a wide range of working conditions were evaluated simultaneously. Results showed that a turning point occurred at the sealing pressure of 1.6 MPa in both the dynamic pressure effect and temperature rise of the gas film under the ambient-temperature gradient, leading to the transformation of the sealing gap, from convergent to divergent. The temperature gradient contributed to decreasing the thermal deformation and improving the sealing performance of the face seal. As the temperature gradient increased, although a mutational phenomenon existed near the sealing temperature of 250 K with both the dynamic pressure effect and the temperature rise, the variation of the opening force was within 120 N and the leakage was more than halved, indicating the broad application prospects of gas face seals in precooled aeroengine systems.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Heat transfer and supercritical fluids · Refrigeration and Air Conditioning Technologies · Spacecraft and Cryogenic Technologies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Institute of Process Equipment and Control Engineering, College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310032, China
Funding
National Nature Science Foundation of China
References (44)
Show source-provided references
1. Thermodynamic analysis of key parameters on the performance of air breathing pre-cooled engine10.1016/j.applthermaleng.2021.117733 ↗
2. Verification at Mach 4 heat conditions of an annular microtube-typed precooler for hypersonic precooled engines10.1016/j.applthermaleng.2021.117742 ↗
3. A thermohydrodynamic analysis of dry gas seals for high-temperature gas-cooled reactor10.1115/1.4007807 ↗
4. The influence of real gas effects on the performance of supercritical CO2 dry gas seals10.1016/j.triboint.2016.05.038 ↗
5. Numerical investigation on flow characteristics and aerodynamic performance of shroud seal in a supercritical CO2 axial-flow turbine10.1016/j.applthermaleng.2020.114960 ↗
6. Design and Analysis of Cooling Structure for Dry Gas Seal Chamber of Supercritical Carbon Dioxide Turbine Shaft End
7. Lee, H., Ma, S., Chen, Y., Zou, Z., and Liu, H. (2017, January 6–9). Experimental study on compact heat exchanger for hypersonic aero-engine. Proceedings of the 21st AIAA International Space Planes and Hypersonics Technologies Conference, Xiamen, China.10.2514/6.2017-2333 ↗
8. Thermodynamic efficiency analysis and cycle optimization of deeply precooled combined cycle engine in the air-breathing mode10.1016/j.actaastro.2017.06.011 ↗
9. Thermodynamic design and optimization of the multi-branch closed Brayton cycle based precooling-compression system for a novel hypersonic aeroengine10.1016/j.enconman.2019.112412 ↗
10. Thermo-distortion characteristics of spiral groove gas face seal at high temperature10.1080/10407790.2019.1693196 ↗
11. Theoretical analysis and experiment on gas film temperature in a spiral groove dry gas seal under high speed and pressure10.1016/j.ijheatmasstransfer.2016.01.045 ↗
12. Coupled thermal-structural-fluid numerical analysis of gas lubricated mechanical seals
13. The effect of convection area on the deformation of dry gas seal operating with supercritical CO210.1016/j.triboint.2019.04.043 ↗
14. Predictions of the thermo elastic deformation of dry gas seal rings in the hydrodynamic lubrication regime10.1177/13506501211059787 ↗
15. Numerical modelling of high pressure gas face seals10.1115/1.2164471 ↗
16. Thermoelastohydrodynamic behavior of mechanical gas face seals operating at high pressure10.1115/1.2768086 ↗
17. An analytical approach to heat transfer and thermal distortions in non-contacting face seals10.1016/j.ijheatmasstransfer.2014.10.011 ↗
18. Thermohydrodynamics of bidirectional groove dry gas seals with slip flow10.1016/j.ijthermalsci.2016.07.011 ↗
19. A thermo-elasto-hydrodynamic lubrication modeling approach to the operation of reactor coolant pump seals10.1016/j.triboint.2019.04.033 ↗
20. The influence of nonuniform heat transfer coefficient distribution on the value of thermal deformations in mechanical gas dynamic seal rings
21. A numerical analysis of the grooved surface effects on the thermal behavior of a non-contacting face seal10.1016/j.proeng.2012.07.037 ↗
22. Thermoelastohydrodynamic behaviour of inclined-ellipse dimpled gas face seals10.1007/s11431-016-0561-5 ↗
23. Research on the performance of supercritical CO2 dry gas seal with different deep spiral groove10.1007/s11630-019-1139-z ↗
24. Thermal analysis of mechanical face seal using analytical approach10.1016/j.tsep.2017.10.023 ↗
25. Thermoelastohydrodynamic characteristics of supercritical CO2 spiral groove face seals10.1108/ILT-05-2020-0169 ↗
26. Cooling behaviors of a novel flow channel in mechanical seals of extreme high-speed rotation for cryogenic rockets10.1016/j.cryogenics.2020.103055 ↗
27. Ultra-high-speed TEHL characteristics of T-groove face seal under supercritical CO2 condition10.1108/ILT-11-2020-0415 ↗
28. Phase change and choked flow effects on rotordynamic coefficients of cryogenic annular seals10.1115/1.4024376 ↗
29. An experimental test on a cryogenic high-speed hydrodynamic non-contact mechanical seal10.1007/s11249-017-0865-1 ↗
30. An experimental study on the cryogenic face seal at different inlet pressures10.1177/1350650119896455 ↗
31. Key technologies for thermodynamic cycle of precooled engines: A review10.1016/j.actaastro.2020.07.039 ↗
32. Numerical investigation of a compact tube heat exchanger for hypersonic pre-cooled aero-engine10.1016/j.applthermaleng.2020.114977 ↗
33. Arp, V.D., and McCarty, R.D. (1998). Thermophysical Properties of Helium-4 from 0.8 to 1500 K with Pressures to 2000 MPa.10.6028/NIST.TN.1334 ↗
34. Angus, S., De Reuck, K.M., and McCarty, R.D. (2016). International Thermodynamic Tables of the Fluid State Helium-4, Elsevier.
35. Zhu, D., Yang, J., and Bai, S. (2021). Thermoelastohydrodynamic Characteristics of Low-Temperature Helium Gas T-Groove Face Seals. Materials, 14.10.3390/ma14112873 ↗
36. Spiral groove face seal behavior and performance in liquid lubricated applications10.1080/10402004.2018.1463426 ↗
37. Analysis on End-face Temperature of High-speed Oil-Gas Two-Phase Backflow Pumping Seal10.1088/1757-899X/544/1/012034 ↗
38. Experimental measurements of the thermo elastic behavior of a dry gas seal operating with logarithmic spiral grooves of 11° and 15°10.1177/1350650120973806 ↗
39. Lebeck, A.O. (1992). Principles and Design of Mechanical Face Seals, John Wiley & Sons.
40. Müller, H.K., and Nau, B.S. (2019). Fluid Sealing Technology: Principles and Applications, Routledge.10.1201/9780203755716 ↗
41. Thermoelastohydrodynamic gas lubrication of spiral-groove face seals: Modeling and analysis of vapor condensation10.1080/10402004.2016.1206648 ↗
42. Blasiak, S. (2020). Influence of thermoelastic phenomena on the energy conservation in non-contacting face seals. Energies, 13.10.20944/preprints202009.0507.v1 ↗
43. Bai, S., and Wen, S. (2019). Gas Thermohydrodynamic Lubrication and Seals, Academic Press.
44. Equations of state for the thermodynamic properties of cryogenic mixtures for helium-4, neon, and argon10.1063/1.5142275 ↗