基于PIV粒子速度场图像大豆蛋白液的可喷性研究

Sprayability of Soybean Protein Solution Based on PIV Particle Velocity Field Image

中文关键词: 可喷性  PIV技术  大豆蛋白液  粒子速度场

英文关键词: sprayability  PIV technology  soybean protein solution  particle velocity field

中文摘要:

      目的 研究不同浓度大豆蛋白液的可喷性，以期得到均匀一致的大豆蛋白膜，也为后期覆膜选择合适的大豆蛋白液浓度提供数据参考。方法 基于PIV速度场图像的间断性判定可喷性。在喷涂参数一定的条件下，利用电子脉冲喷头对不同浓度的大豆蛋白液进行喷雾，并通过PIV技术测定大豆蛋白液喷涂雾化颗粒速度场图像，随后处理图像，定性和定量分析不同浓度大豆蛋白液的可喷性。结果 在喷涂参数恒定的条件下，当大豆蛋白液浓度较低时，雾化特性较好，可喷性良好;随着浓度的增加，大豆蛋白液的粒子速度场逐渐收缩，可喷性变差。在高浓度时(质量分数为9.73%)，粒子速度场出现间断区域，没有形成连续完整的扇形面，且截线上径向距离的速度曲线出现间断，因此，大豆蛋白液质量分数为9.73%时的可喷性较差。结论 基于PIV速度场图像判定可喷性的方法能为获得均匀一致的大豆蛋白膜提供有力的参考。

英文摘要:

      This paper aims to study the sprayability of soybean protein solution at different concentrations, attempting to obtain a uniform soybean protein film and provide a data reference for the selection of a suitable concentration of soybean protein solution for later mulching. The sprayability is judged based on the discontinuity of the PIV velocity field image. Under certain conditions of spraying parameters, the electronic pulse nozzle is used to spray different concentrations of soybean protein solution, and the PIV technology is used to measure the speed field image of the sprayed atomized particles of the soybean protein solution, and then the image is processed to qualitatively and quantitatively analyze the sprayability of the soybean protein solution of different concentrations of soybean protein. Under the condition of constant spraying parameters, when the concentration of the soybean protein liquid is low, the atomization characteristics are better and the sprayability is good; with the increase of the concentration, the particle velocity field of the soybean protein solution gradually shrinks, and the sprayability becomes worse. When the concentration is high (the mass fraction is 9.73%), the particle velocity field has discontinuous areas, no continuous and complete fan-shaped surface is formed, and the velocity curve of the radial distance on the cross-section line is discontinuous. Therefore, when the mass fraction of soybean protein solution is 9.73%, the sprayability is poor. The results show that the method of judging the sprayability based on the PIV velocity field image can provide a powerful reference for obtaining a uniform soybean protein film.