船式拖拉机底板非光滑表面减阻机理研究
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摘要
基于Fluent软件对船式拖拉机底板建立三维模型,采用数值模拟的方法研究非光滑表面凹坑结构对机身底板的减阻影响。研究非光滑表面凹坑在不同深度、直径下滑行阻力的影响规律,选取最优的凹坑组合成等距排列、等差排列、菱形排列3种结构。分析凹坑结构的减阻机理,发现压差阻力增大、摩擦阻力减小是总阻力减小的原因。结果表明:船式拖拉机凹坑结构具有良好的减阻效果;相比光滑的船式拖拉机底板,非光滑表面凹坑直径为8mm,深度为5mm的等距排列结构的减阻率达到了5. 4%。
A three-dimensional model of boat tractor was built based on the Fluent in thesis,and the influence of the non-smooth surface pits on the fuselage floor was studied by numerical simulation. After the influence under different depth and diameter was studied,the most optimal pits composed of isometric,arithmetic and rhombus was chose. The drag reduction mechanism of pit structure was analyzed,it is found that the pressure resistance increases and the frictional resistance reduce is the reason for the total resistance reduce. The result shows that compared with a smooth boat tractor,non-smooth surface pit structure has better drag reduction effect. The drag reduction efficiency of non-smooth surface pit structure has reached 5. 4%,which has equidistant alignment structure with 8 mm diameter and 5 mm depth.
A three-dimensional model of boat tractor was built based on the Fluent in thesis,and the influence of the non-smooth surface pits on the fuselage floor was studied by numerical simulation. After the influence under different depth and diameter was studied,the most optimal pits composed of isometric,arithmetic and rhombus was chose. The drag reduction mechanism of pit structure was analyzed,it is found that the pressure resistance increases and the frictional resistance reduce is the reason for the total resistance reduce. The result shows that compared with a smooth boat tractor,non-smooth surface pit structure has better drag reduction effect. The drag reduction efficiency of non-smooth surface pit structure has reached 5. 4%,which has equidistant alignment structure with 8 mm diameter and 5 mm depth.
引文
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[14]马付良,曾志翔,高义民,等.仿生表面减阻的研究现状与进展[J].中国表面工程,2016,29(1):7-15.
[15]杨晓东,任露泉.形体减阻类型、减阻机理与仿生[J].农业机械学报,2003,34(1):130-133.
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[2]徐钧国,李振镛,李建平,等.船体对比磨损规律试验研究[J].农业机械学报,1992(1):69-74.
[3]陶敏.凹坑形仿生非光滑表面减阻和遗传优化研究[D].长春:吉林大学,2007.
[4]杨易,聂云,范光辉,等.车尾凹坑非光滑表面气动减阻分析与优化设计[J].中国机械工程,2013,24(24):3396-3401.
[5]金益锋,谷正气,容江磊,等.汽车凹坑型非光滑表面减阻特性的分析与优化[J].汽车工程,2013,35(1):41-45.
[6] Xiao-wen SONG,Peng-zhe LIN,Rui LIU,等.变异卵圆形凹坑非光滑表面的气动摩擦减阻研究[J].浙江大学学报,2017,18(1):59-66.
[7]刘惠枝.边界层理论[M].北京:人民交通出版社,1991.
[8]李庭国.农机发展现状与策略研究[J].南方农机,2016,47(9):24.
[9]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.
[10]徐中,赵军,吴正华,等.凹坑形非光滑表面的减阻性能分析[J].航空精密制造技术,2009,45(1):33-34.
[11]刘庆萍.水—固界面系统二元仿生耦合减阻研究[D].长春:吉林大学,2013.
[12]柯贵喜,潘光,黄桥高,等.水下减阻技术研究综述[J].力学进展,2009,39(5):546-554.
[13]张营,吕玉山.叶序排布非光滑减阻表面的凹坑尺寸效应[J].新技术新工艺,2014(5):62-65.
[14]马付良,曾志翔,高义民,等.仿生表面减阻的研究现状与进展[J].中国表面工程,2016,29(1):7-15.
[15]杨晓东,任露泉.形体减阻类型、减阻机理与仿生[J].农业机械学报,2003,34(1):130-133.
[16]盛振邦,刘应中.船舶原理[M].上海:交通大学出版社,2004.