聚酰胺(PA)单丝网片具有较好的渔用材料性能，在渔具减阻降耗方面具有一定的开发利用潜力。通过水槽试验，设计研究了7种不同线面积系数(α=0.050~0.173) PA单丝双死结网片的水动力变化规律，并与PA复丝单死结网片、超高分子量聚乙烯(UHMWPE)复丝单死结网片，及PE绞捻网片的水动力特性进行对比分析。结果显示：PA单丝双死结网片垂直于水流时，阻力系数CD90在1.043~1.411范围内与线面积系数成正相关关系；平行于水流时，阻力系数CD0在0.223~0.359范围内与线面积系数成负相关关系，从而也证实了线面积系数对于网片阻力特性存在双重影响；当PA单丝双死结网片与水流方向呈倾斜角度时，阻力系数随冲角的增大而增大，而升力系数CLθ先增大后减小，在50°时达到最大值。对比3种不同材料网片的水槽试验，当网片垂直于水流时，PA单丝双死结网片的阻力系数比PA复丝单死结网片小9.8%，比UHMWPE复丝单死结网片大17.3%，比PE绞捻网片小14.7%；当网片平行于水流时，PA单丝双死结网片的阻力系数比PA复丝单死结网片大16.6%，比UHMWPE复丝单死结网片大35.3%，比PE绞捻网片小21.2%。从而说明在相同条件下，应用PA单丝网片可以降低水流阻力，为PA单丝网具的设计、制作与应用提供了理论依据。

The PA monofilament netting has good properties of fishing material and has potential in reducing drag and consumption of fishing gear. Through flume experiments, the hydrodynamic variation rules of 7 PA monofilament double-knotted nettings with different linear area coefficients (α=0.050~0.173) were designed and studied, and the hydrodynamic properties of PA multifilament single-knotted netting, UHMWPE multifilament single-knotted netting and PE twisted netting were compared and analyzed. It was found that when the PA monofilament double-knotted nettings were vertical to the water flow, drag coefficients CD90 were in the range of 1.043~1.411, positively correlated with the linear area coefficients; when they were parallel to the water flow, drag coefficients CD0 were in the range of 0.223~0.359, negatively correlated with the linear area coefficients, thus proving that the linear area coefficients had a double influence on drag properties of netting; when the PA monofilament double-knotted nettings were placed at an angle to the water flow, the drag coefficients increased as attack angle increased, and the lift coefficient CLθ increased first and then decreased, and reached the maximum at 50°. In the flume experiment of 3 different nettings, when the netting was vertical to the water flow, the drag coefficient of PA monofilament double-knotted netting was 9.8% smaller than that of PA multifilament single-knotted netting, 17.3% greater than that of UHMWPE multifilament single-knotted netting and 14.7% smaller than that of PE twisted netting; when the netting was parallel to the water flow, the drag coefficient of PA monofilament double-knotted netting was 16.6% greater than that of PA multifilament single-knotted nettings, 35.3% greater than that of UHMWPE multifilament single-knotted netting, and 21.2% smaller than that of PE twisted netting. Therefore, it is shown that under the same conditions, PA monofilament netting can reduce the flow resistance, which provides a theoretical basis for the design, manufacture and application of PA monofilament netting gear.