有压管道孔板局部阻力相邻影响机理研究

Research on the Mechanism of Orifice Plate's Local Resistance Adjacent Influence of Pressure Pipe

为揭示有压管道孔板局部阻力相邻影响机理,采用标准k-ε紊流模型对孔板间相邻影响系数随孔板孔径比、厚径比及相对间距的变化关系以及不同工况时的流场特性进行了数值模拟研究。研究结果表明:相邻影响系数C<1.0时,其随孔板孔径比、厚径比及两孔板相对间距的减小而减小,即两孔板形变件间的相互影响程度逐渐增大;当C=1.0时,其随各影响因素的增加不再变化,即两孔板形变件间无相互影响。不同工况下的单个孔板及两个孔板的流场结果对比分析表明孔径比、厚径比增大,单个孔板的影响长度减小,通过改变单个孔板的影响长度间接改变了相邻影响程度,而相对间距与影响长度的比值直接决定相邻影响程度,阐明了各影响因素对局部阻力相邻影响现象的影响机理。

To reveal the mechanism of orifice plate＇s local resistance adjacent influence in pressure pipe,the numerical simulation experiment is made to study the adjacent influence coefficient with the changing relationship of the aperture ratio,thick diameter ratio,the relative distance and flow field under different working conditions is studied by using the standard k-epsilon model.The results show that：if C1.0,it will decrease along with the decrease in the aperture ratio,thick diameter ratio and the relative distance.If C=1.0,it changes with the increase in the influence factors no longer.A comparative analysis is made between a single orifice plate and the two orifice plate＇s flow field under different working conditions to clarify the influence mechanism.The results show that：aperture ratio and thick diameter ratio change the adjacent degree indirectly by changing the influence length of a single orifice.The ratio of the relative distance and the influence length decide the adjacent degree directly.