Abstract:

The primary breakup process of coal-water slurry (CWS) of the coaxial air-blast atomizer has been studied by a high-speed camera.The jet core length and oscillating frequency of coal-water slurry in the near-field region were investigated.The results showed that the breakup process of CWS was performed in the non-axisymmetric Rayleigh-type breakup regime in the experiment.The equation of dimensionless liquid jet core length with gas jet velocity and liquid jet velocity was obtained.The oscillating frequency was characterized by the Strouhal number.The relationship between the Strouhal number and Weber number & Reynolds number of liquid was investigated.

Key words: 气流雾化；水煤浆；射流核心长度；FONT-SIZE: 10.5pt, mso-bidi-font-size: 11.0pt, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-fareast-font-family: 宋体"> FONT-SIZE: 10.5pt, mso-bidi-font-size: 11.0pt, mso-ascii-font-family: Times New Roman, mso-bidi-font-family: Times New Roman, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA">振荡频率

摘要：

以水煤浆和空气作为实验介质，利用高速摄像仪对同轴双通道喷嘴水煤浆气流雾化的初次破裂过程进行了实验研究，重点考察了在喷嘴出口附近水煤浆的射流核心长度和振荡频率等特征。研究结果显示，实验中水煤浆的破裂模式为非轴对称雷利破裂模式，根据实验结果，得到了浆体的量纲1射流核心长度与气速和液速之间的关系式。雾化过程中浆滴的产生与水煤浆射流振荡有关，研究了其Strouhal数与Weber数和液体Reynolds数之间的关系。

关键词: 气流雾化；水煤浆；射流核心长度；FONT-SIZE: 10.5pt, mso-bidi-font-size: 11.0pt, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-fareast-font-family: 宋体"> FONT-SIZE: 10.5pt, mso-bidi-font-size: 11.0pt, mso-ascii-font-family: Times New Roman, mso-bidi-font-family: Times New Roman, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA">振荡频率