多孔蒸汽浸没射流压力振荡强度特性研究

Research on Characteristics of Pressure Oscillation Intensity due to Multi-Holes Steam Jet Submerged in Subcooled Water

实验研究了一定冷却水温度和蒸汽质量流率范围内出口直径为8 mm的多孔喷嘴射流压力振荡强度特性。结果表明:孔间距和孔数对压力振荡强度的轴向分布规律无影响,即压力振荡强度随轴向无量纲距离的增大先增大后减小,存在明显的峰值点;随蒸汽质量流率的增大,峰值增大、峰值点后移。相同汽水参数条件下,随孔数的增多,压力振荡强度增大,峰值增大、峰值点后移;随无量纲孔间距的增大,双孔压力振荡强度先增大后减小,峰值先增大后减小,峰值点先后移再向前移;三孔1.5的压力振荡强度小于三孔1.2和三孔2.0。不同孔间距多孔喷嘴压力振荡峰值和峰值点位置随冷却水温度的变化规律不尽相同。

The research on characteristics of pressure oscillation intensity of steam discharged from 8 mm multi-hole nozzles into the subcooled water is carried out in range of subcooled water temperature and steam mass flux.Experimental results show that hole pitch and hole number have no effect on the axial distribution of pressure oscillation intensity. The pressure oscillation intensity firstly increases and then decreases with the axial dimensionless distance and there are obvious peak points. With the increase of steam mass flux, the peak value increases and the peak point moves backward. Under the same steam-water parameters, the pressure oscillation intensity and the peak value increase with the increase of hole number, Meanwhile, the peak point moves backward. The pressure oscillation intensity and peak value of double holes under the same steam-water parameters decreased firstly and then increased along with the increase of hole pitch. While the peak point moves backward firstly and then forward. The pressure oscillation intensity of three-hole 1.5 is less than that of three-hole 1.2 and 2.0. The peak value and position variation of pressure oscillation intensity of multi-hole nozzles are different with the subcooled water temperature.