压差流阻测试装置研制及涂层减流阻作用研究

The Design of Testing Equipment for Drag Resistance Effect Based on Differential Pressure Principle and the Study of Drag Reduction Characteristic of Coatings

基于压差流阻测量原理,应用高精度压力传感器结合计算机辅助测试软件,研制出管路内壁涂层减阻性能测试装置,经过计算机仿真验证和实际使用验证,设计合理,适用于各种涂层减流阻性能评价,使用方便,测量精度高。通过改变流量和入口水压连续测量管路内部流体压力变化,试验研究了在管道内壁涂敷有机高分子材料(低表面能材料、环氧色漆)的减阻性能,发现低表面能涂层的减阻效果良好,可达21.7%,涂层的减阻原因在于其疏水性和对壁面粗糙度的减小作用。

A kind of testing equipment was designed to test the drag reduction property of coating on the internal wall of pipe based on differential pressure measure principle. According to the computer simulation technology and the verification with actual practice, the designed testing equipment is proved to be rational, convenient and holding high precision, which can be used to the drag-reducing property evaluation of diverse coatings. When the flow rate and inlet pressure of pipe were changed successively, the variation of fluid pressure can be gauged by high accuracy pressure sensor and the aided testing software of computer. The drag reducing effect of organic macromolecular materials such as low surface energy coating and epoxy coating was evaluated with the rational testing equipment in the laboratory. The evaluation shows that the coatings contain low surface energy material and epoxy resin has good drag reduction function due to hydrophobic property and the roughness of pipe wall. Low surface energy coating has the better drag-reducing effect and the maximum drag reduction rate of it is 21.7%.