内河肥大型货船浅水阻力计算方法研究

Calculation and analysis on shallow water resistance of inland fat cargo ships

随着二、三级航道建设力度加大和绿色航运理念日益深入人心,内河主力千吨级货船的技术经济性能对航运效益和绿色环境起着重大的作用.而在内河航道,随着船舶吃水增加,浅水效应越来越明显,对内河肥大型船阻力影响剧增.所以在保持船长、船宽、型深、吃水和浮心纵向位置不变的前提下,通过改变方形系数大小来生成相关系列船型,采用CFD方法针对不同的水深吃水比,进一步分析研究系列船型不同速度时的阻力系数,并对剩余阻力系数图谱数值处理、摩擦阻力系数公式修正,通过MATLAB工具编程推出简捷、可靠的阻力计算GUI程序,对内河航运船舶相关性能的估算和研究有一定的参考和借鉴作用.

With the continuous construction of the level-two or-three channels and the strengthening of the concept of green shipping, the technical and economic performance of the main kiloton cargo ship plays an important role in the shipping benefit and the green environment. In inland waterways, with the increase of ship draft, the shallow water effect is more and more obvious, and the resistance of inland water fat ship is increasing sharply. So in the premise of maintaining the ship′s length, width, depth, draft and LCB unchanged, the related series of ships are generated by changing the square coefficient, and then the CFD method is applied to different depth draft ratio to further analyze and study the resistance coefficients of the series of ships at different speeds. The spectrum of residual resistance coefficients are numerically processed, the friction coefficient formula is modified, and a simple and reliable GUI program of resistance calculation by MATLAB tool is introduced. Our study has a certain reference value in the estimation of inland navigation vessel performance.