多级毛细小孔流动损失的有限元分析

Finite Element Analysis of Multi-Level Capillary Holes Flow Loss

针对单一细长毛细孔在加工、量程不可调等方面存在的问题,提出了串联多级层流小孔的设计思想,利用有限元方法对串联毛细孔进行了流场特性分析.分析结果表明,串联多级毛细孔两端差压均匀分布在各组合毛细孔上,毛细孔的连接处不产生明显压降.在小孔两端差压相同的情况下,串联毛细孔流量等于经过等效长度相同的单一毛细孔的流量与损失因子之积,两端差压与流量仍保持线性关系.

Multi-level capillary difficult to implement and holes are designed to replace a single long capillary hole which is unsuitable for an adjustable measurement range. Flow field characteristic analysis of multi-level capillary holes is performed. Analytical study results indicate that each capillary hole bears equal pressure drop, there is no obvious pressure drop on large holes between multi-level capillary holes. The relationship between differential pressure and flow rate through multi-level capillary holes is still linear. And the flow rate through multi-level capillary holes equals to that through a single one with the same effective length multiply with a loss factor on the condition that multi-level holes bearing the same differential pressure.