掺气槽上射流挟气量的数学模型

本文分析了掺气槽空腔区射流底缘气水界面上空气掺入水体过程的作用因素及受力情况，认为掺气是由于气水界面紊动涡体的脉动作用造成自由表面局部凹曲率超过临界值而发生的；建立了临界掺气流速和射流挟气量的理论表达式，它反映了影响射流掺气特性的各种因素及其相互关系，提出的射流挟气量公式得到部分原模型资料的验证，研究表明，射流挟气量受多种因素的影响，其中来流的紊动是影响掺气的重要因素，研究初步揭示出模型和原型通气

A mathematical model for self-aeration capacity of free jet on the aerator

Based on the analysis of the acting forces and factors affecting the entrainment process of air from the lower surface of free jet on the aerator, the authors established the expressions for calculation of critical velocity and capacity of air entraiment. The formulas are verified by model tests and prototype investigations. Study shows that flow turbulence is the major factor that affecting the air entrainment and the scale effect is caused by the fact that the surface roughness in the model is too small.