蟹塘双体投饵船行驶阻力分析及船型优化

采用双体投饵船是实现蟹塘遍撒投饵的可行方案之一。在航道存在水草的情况下,为减小巡航阻力、提升投饵船续航能力,设计尖底和圆棱底2种新型船底型线,并基于雷诺平均方程,构建船体在不同吃水深度和速度下的动力学计算模型。以平底船为对照船体,对比分析CFD数值计算与水池试验阻力,数据误差在9.6%以内,显示了计算模型的有效性。计算结果表明:圆棱底船在船速0.50~2.00 m/s时具有更好的减阻效果,与平底船相比减阻率在3.92%~16.27%;圆棱底船能减小底面与水草的滑动摩擦阻力;投饵船经济船速应小于1.50 m/s,经济吃水深度应小于0.18 m。所研发的圆棱底船的进一步测试结果表明了所提优化方案的有效性。

Analysis of driving resistance and optimization of boat type for crab pond catamaran bait boat

The catamaran bait boat is one of the feasible schemes to realize the sprinkled bait on the crab pond. In the presence of water plants in the channel, in order to reduce the cruise resistance and improve the endurance of the bait boat, two new bottom profiles, sharp bottom and round bottom, are designed in this paper. Based on the Reynolds average N-S equation, the dynamic calculation models of the boat under different draughts and speeds are constructed. Taking the flat bottom boat as the contrast boat, the CFD numerical calculation and the sink test resistance are compared and analyzed, the data error is less than 9.6%, which shows the effectiveness of the calculation model. The results show that the round bottom boat has better resistance reduction effect at the speed of 0.5-2m/s, and the resistance reduction rate is 3.92%-16.27% compared with the flat bottom boat; The round bottom boat can reduce the sliding friction resistance between bottom and water plants; the economy of bait boat is at the speed of less than 1.5m/s and the draft is less than 0.18m. The further test results of the round bottom boat show the effectiveness of the proposed optimization scheme.