航空燃油污染在三通管路的分布试验

Experiments for Aviation Fuel Pollution in a Junction of Three Branches

航空燃油污染对于整个燃油系统故障有举足轻重的地位。燃油流量以及质量是实时监测的重要参数。对于三支路交叉管道的燃油污染分布情况,设计了以蒸馏水为模拟介质,通过pH测定浓度进而得到流量的系列试验。单直管道的试验表明所选方法是可行的,流量和横向扩散系数都与理论保持一致。三支路交叉管道的试验则证明交叉混合区流场的三维湍流特性,以及已污染和未污染燃油之间的分界线的动态不确定性;同时可模拟出流向扩散、横向扩散以及纵向扩散的进程。

Aviation fuel pollution is the one of the most important factors in fuel system failure, so fuel flow debit and quality are the parameters for real-time monitoring. For studying pollution distribution in a junction of three branches, a series of experiments with distilled water, are designsed by using measured pH to determine the concentration and then integrate the flow debit. The experiment in a single straight channel shows that the chosen method is fairly acceptable the debit and transverse diffusion coefficient are consistent with the theory. The experi- ments in a junction of three branches prove that the flow is three-dimensional with characteristics of turbulence flow field, and that the dividing line between polluted fuel and unpolluted fuel is not so clear. Meanwhile, the process of longitudinal diffusion, transverse diffusion and vertical diffusion can be studied.