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- Title
天然气单流涡流管流场与温度场数值模拟.
- Authors
王 凯; 谢 磊; 欧阳欣; 闫 锋; 王海峰; 韩 涛
- Abstract
A single circuit vortex tube (SCVT) is structurally modified on the traditional Ranque-Hilsch vortex tube (RHVT), and it has greater advantages of safety and energy saving in the online heating of pressure regulating system of natural gas line pipes. In order to make the SCVT technology better adapt to the adjustment of working conditions and the change of environmental temperature of natural gas pipeline systems, an SCVT flow field and temperature field calculation model was established based on previous research achievements on RHVTs. Then, the calculation model was verified and analyzed based on loop experimental data. Finally, the characteristics of SCVTs under typical working conditions were numerically simulated and analyzed, including tangential motion, axial motion, static pressure, static temperature and short-circuit flow. And the following research results were obtained. First, the flow field is composed of a series of "short-circuit flow" whose flow rate decreases continuously along the hot end tube. Second, in the structure of flow field, there is an energy separation interface parallel to the center of the tube, where the axial velocity is 0. The static pressure does not change with the axial position, and the axial velocity of the inner and outer swirling flow on both sides of the interface is opposite. Third, in the first half section near the nozzle, static pressure, static temperature, tangential velocity and axial velocity vary largely along the radial direction, and the effect of energy separation is remarkable. Fourth, the static temperature is the highest on the tube wall, and it increases exponentially along the hot end pipe. The larger length/diameter ratio of the hot end pipe leads to the increase of the heat exchange area with the heated gas, which is conducive to improving the heating performance of SCVTs. In conclusion, the research results can provide technical support for the popularization and application of VT heating technology.
- Subjects
VORTEX tubes; STATIC pressure; NATURAL gas pipelines; PIPELINES; HEAT; SWIRLING flow
- Publication
Natural Gas Industry, 2020, Vol 40, Issue 7, p113
- ISSN
1000-0976
- Publication type
Article
- DOI
10.3787/j.issn.1000-0976.2020.07.014