池沸腾噪声产生机理研究及其控制技术

The research and control technology of boiling noise generation in the pool

对池沸腾噪声产生机理进行了分析,通过研究气泡演变过程与噪声的关系,确定了气泡破裂噪声是池沸腾噪声的主要声源。从气泡动力学角度对气泡进行了受力分析,确定底壁接触角与气泡半径的关系,即随着接触角的增加,气泡半径呈增大趋势。采用VOF方法对气泡脱离行为进行数值模拟,研究了底壁接触角对气泡尺度及脱离时间的影响。通过接触角与噪声实验,发现随着接触角的增加,最大声功率呈递减趋势,验证了调整接触角大小可控制气泡尺度,进而抑制噪声大小的结论。

The mechanism of generating pool boiling noise was analyzed in this paper,it was determined that bubble burst noise was the main noise source of pool boiling noise,by studying the relationship between bubble evolution process and noise.The relationship between the contact angle of the bottom wall and the bubble radius was determined by the force analysis of the bubble from the perspective of bubble dynamics.That was,the bubble radius increased with the increase of the contact angle.The bubble detachment behavior was simulated numerically by VOF method,and the influence of contact angle on bubble size and detachment time was studied.It was found that the maximum sound power decreased with the increase of the contact angle.It was proved that the bubble size could be controlled by adjusting the contact angle and the noise could be suppressed.