本文实验研究了蒸馏水经内径0.226 mm、长度16.5 mm薄壁不锈钢直管向真空环境排放时形成的液体闪蒸射流现象.实验观察到3种射流形态.在液体初始温度低于背压所对应的饱和温度时,液体不会发生闪蒸,液体射流喷出后保持完整;反之,液体表面蒸发会导致液体射流核周围出现不规则蒸发波,射流破碎散落;进一步降低背压,会使得射流一出喷口即快速破碎形成扩张角大于90°的雾状射流.射流流量在背压低于某个临界数值时出现壅塞现象,即流量不再随背压降低而增加,表现出强烈的可压缩流动特征.
参考文献
| [1] | J. R. Simoes-Moreira;M. M. Vieira;E. Angelo .Highly Expanded Flashing Liquid Jets[J].Journal of thermophysics and heat transfer,2002(3):415-424. |
| [2] | Vieira MM;Simoes-Moreira JR .Low-pressure flashing mechanisms in iso-octane liquid jets[J].Journal of Fluid Mechanics,2007(0):121-144. |
| [3] | Pavlenko, A.N.;Koverda, V.P.;Reshetnikov, A.V.;Mazheiko, N.A.;Surtaev, A.S.;Zhukov, V.E. .Peculiarities of superheated liquid discharging under strong and weak nonequilibrium conditions[J].Journal of engineering thermophysics,2010(4):289-305. |
| [4] | 杜王芳,赵建福,李凯.快速减压条件下液滴热动力学行为的实验研究[J].工程热物理学报,2012(08):1349-1352. |
| [5] | Vyacheslav N. Yarygin;Victor G. Prikhodko;Igor V. Yarygin .Jet Expansion of Gas with Near-Wall Liquid Film from Nozzle into Vacuum[J].Microgravity science and technology,2009(Suppl.1):271-275. |
| [6] | J. A. J. Avila;M. M. Pimenta;J. R. Simoes-Moreira .Numerical solution of the two-phase expansion of a metastable flashing liquid jet using the dispersion-controlled dissipative scheme[J].International Journal for Numerical Methods in Fluids,2010(5):622-637. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%