不凝结气体对蒸汽浸没射流压力振荡强度的影响

Effect of Non-condensable Gas on Pressure Oscillation Intensity of Submerged Steam Jet

  • 摘要: 对含不凝结气体(空气)的蒸汽浸没射流压力振荡特性进行了实验研究。研究发现,含有少量不凝结气体时,蒸汽浸没射流凝结形态发生显著变化。含不凝结气体的压力振荡强度较纯蒸汽时明显变小,但含有少量不凝结气体的压力振荡强度随空气质量分数的增加整体呈缓慢上升趋势。压力振荡强度随径向距离的增加而单调减小,随轴向距离的增加先增大后逐渐减小,存在压力振荡峰值,且随空气质量分数的增加,压力振荡峰值位置沿轴向后移。压力振荡峰值位置在轴向无量纲距离X=3和X=12之间。不同过冷水温度下,压力振荡峰值随空气质量分数变化的趋势不同。压力振荡峰值的位置即压力振荡最强的位置位于核心汽羽的尾部。

     

    Abstract: Effect of non-condensable gas on pressure oscillation intensity of submerged steam jet was studied experimentally. The study finds that the steam condensation flow patterns of submerged steam jet change significantly when there is a small amount of non-condensable gas. The pressure oscillation intensity of submerged steam jet containing non-condensable gas is significantly smaller than that of pure steam. The pressure oscillation intensity increases slowly with the air mass fraction, decreases monotonously with the increase of the radial distance and increases first and then decreases gradually with the increase of the axial distance. As the air mass fraction increases, the axial position of pressure oscillation intensity peak shifts downstrem. The peak position is between the axial dimensionless distance X=3 and X=12. At different subcooled water temperatures, the peak trend varies differently with the air mass fraction. The peak position,i.e., the position of the strongest pressure oscillation intensity, is located at the tail of the core steam plume.

     

/

返回文章
返回