基于多相流的船式拖拉机减阻性能分析
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摘要
船式拖拉机是深泥脚水田耕整作业的新型拖拉机,其船壳阻力是影响性能的重要因素。为此,通过测量水田土壤流变特性、简化实际的船体结构,考虑空气、水、泥浆3种介质,构建船式拖拉机船体多相流数值仿真模型,研究了工况速度与船体粘性阻力、兴波性能之间的关系及水层的减阻性能,并开展船模实验。结果表明:船底不完全满足动压润滑条件,导致水层减阻效果不明显,在船体底部安装侧挡板的方法可以提高动压润滑的能力,降低船体行驶阻力。
The ship type tractor is a new type of tractor which is used in deep mud foot water field,the hull resistance is an important factor affecting performance.In this paper,by measuring the rheological properties of paddy soil,simplifying the actual hull structure,and considering air,water and mud,a numerical simulation model of ship tractor hull multiphase flow is constructed. The relationship between the working condition velocity and the ship's viscous resistance and wave-making performance is studied,The anti-drag performance of water layer is studied and ship model experiment is carried out.It is concluded that the bottom of the ship does not fully meet the dynamic pressure lubrication condition,resulting in the inconspicuous anti-friction effect of water layer.
The ship type tractor is a new type of tractor which is used in deep mud foot water field,the hull resistance is an important factor affecting performance.In this paper,by measuring the rheological properties of paddy soil,simplifying the actual hull structure,and considering air,water and mud,a numerical simulation model of ship tractor hull multiphase flow is constructed. The relationship between the working condition velocity and the ship's viscous resistance and wave-making performance is studied,The anti-drag performance of water layer is studied and ship model experiment is carried out.It is concluded that the bottom of the ship does not fully meet the dynamic pressure lubrication condition,resulting in the inconspicuous anti-friction effect of water layer.
引文
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[3]周文浦,王良模.气幕减阻对模型船体起步阻力影响的分析[J].拖拉机,1991(5):12-16.
[4] Thai N C,Chancellor W J. Boat-Tractor Hull Design with Shallow-Water Theory[J]. Transactions of the ASABE,1985(4):1082-1089.
[5] Zhou M,Zhang L.Structural Optimization for Rack of Boattype Tractor Based on Sensitivity analysis[J]. Transactions of the Chinese Society of Agricultural Engineering,2016(32):54-60.
[6] Gee-Clough D,Palaniappan S,Gavino R B.Filed Performance Tests of Turtle Tiller and Boat Tractor[J]. Agricultural Mechanization in Asia,Africa and Latin America,1990,21(3):9-12.
[7]周明刚,王高波,刘明勇,等.船式拖拉机凸包非光滑表面船壳减阻性能研究[J].农机化研究2018,40(2):236-240,246.
[2]周用权,王修斌.机耕船犁耕时总体动力学若干问题的理论分析[J].农业机械学报,1979(1):47-67.
[3]周文浦,王良模.气幕减阻对模型船体起步阻力影响的分析[J].拖拉机,1991(5):12-16.
[4] Thai N C,Chancellor W J. Boat-Tractor Hull Design with Shallow-Water Theory[J]. Transactions of the ASABE,1985(4):1082-1089.
[5] Zhou M,Zhang L.Structural Optimization for Rack of Boattype Tractor Based on Sensitivity analysis[J]. Transactions of the Chinese Society of Agricultural Engineering,2016(32):54-60.
[6] Gee-Clough D,Palaniappan S,Gavino R B.Filed Performance Tests of Turtle Tiller and Boat Tractor[J]. Agricultural Mechanization in Asia,Africa and Latin America,1990,21(3):9-12.
[7]周明刚,王高波,刘明勇,等.船式拖拉机凸包非光滑表面船壳减阻性能研究[J].农机化研究2018,40(2):236-240,246.