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| Flow and heat transfer characteristics inside gas cylinder #br#
during quenching process |
| GAO Jingna1，2，LI Qiang1，3，GAO Ying2，LI Jianhui2，WANG Ge1 |
(1. School of Mechanical Engineering， Yanshan University， Qinhuangdao 066004， Hebei， China；2. College of
Materials Science and Engineering， Hebei University of Science and Technology， Shijiazhuang 050018， Hebei， China；
3. College of Materials Science and Engineering， Hebei University of Technology， Tianjin 300401， China) |
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Abstract The flow and heat transfer process of largediameter thickwalled cylinders during internal quenching are extremely complicated，which is affected by many factors. And it is of great theoretical significance to study the variation law of internal pressure and temperature of gas cylinders for improving the flow and heat transfer effect and improving the microstructure and performance of the product. The thickwalled gas cylinder with a diameter 914 mm and its internal fluid were taken as the research object，and a twodimensional equivalent fluidsolid coupling model was established. The multinozzle system was used to spray water quenching on the inner and outer wall surfaces of the cylinder. The effects of the cylinder length，water spray velocity and quenching time on the pressure inside the cylinder and temperature on the inner wall were studied. The correctness of the mathematical model was verified by intermittent quenching test. The results show that，the influence of cylinder lengths on the pressure and temperature is significant，followed by the spray velocity. When the spray velocity is greater than 8 m/s，the cooling effect of spray volume on the inner wall is greatly reduced. The temperature gradient on the inner wall along the length direction of the cylinder decreases with the increasing of the total length of the cylinder and the extension of quenching time，respectively，but basically not affected by the amount of water spraying.
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