本文選題：變異卵圓形凹坑　切入點(diǎn)：非光滑表面　出處：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2017年01期 　論文類型：期刊論文

【摘要】：目的:仿生非光滑表面具有降低表面摩擦阻力的作用,傳統(tǒng)的非光滑結(jié)構(gòu)有溝槽和凹坑等。本文旨在研究變異卵圓形凹坑非光滑表面的氣動(dòng)摩擦減阻特性及其減阻機(jī)理。創(chuàng)新點(diǎn):1.以仿生學(xué)理論為基礎(chǔ),提出變異卵圓形凹坑結(jié)構(gòu)模型,突破現(xiàn)有非光滑結(jié)構(gòu)類型的局限;2.采用參數(shù)構(gòu)造的方法研究變異卵圓形各構(gòu)造參數(shù)對(duì)表面摩擦阻力減阻的影響。方法:1.采用半徑、半軸和坑深3個(gè)尺寸參數(shù)對(duì)變異卵圓凹坑結(jié)構(gòu)進(jìn)行幾何定義,并將非光滑結(jié)構(gòu)以一定縱向間距按矩形排布布置在仿真模型底部;2.以3個(gè)尺寸參數(shù)和縱向間距設(shè)計(jì)"三水平四因素"正交實(shí)驗(yàn),在不同氣流流速下進(jìn)行數(shù)值模擬仿真;3.通過速度矢量、邊界層厚度變化和壓力分布研究變異卵圓形凹坑非光滑表面的氣動(dòng)摩擦減阻機(jī)理。結(jié)論:1.變異卵圓形非光滑表面具有一定的氣動(dòng)摩擦減阻效果,和光滑表面相比,在空氣來流速度為24 m/s時(shí),有10%的減阻效果;2.正交實(shí)驗(yàn)分析表明,4個(gè)試驗(yàn)因素對(duì)減阻效果的影響從大到小排列分別為:半徑、坑深、半軸和縱向間距;3.變異卵圓形凹坑表面增加了邊界層的厚度,降低了近壁面區(qū)域的速度梯度,減少了剪切力,從而起到了減少摩擦阻力的效果。
[Abstract]:Objective: the bionic non-smooth surface can reduce the friction resistance of the surface. Traditional non-smooth structures include grooves and pits. This paper aims to study the drag reduction characteristics and drag reduction mechanism of non-smooth surface of variable oval pits. A model of variable oval concave structure is put forward to break through the limitation of existing non-smooth structure types. 2. The influence of structural parameters of variable oval structure on friction drag reduction of surface is studied by parameter structure method. The geometric definition of the variable oval concave structure is given by three dimensional parameters of the semi-axis and the pit depth. At the bottom of the simulation model, the non-smooth structure is arranged at the bottom of the simulation model with a certain longitudinal spacing according to the rectangular spacing. The orthogonal experiment of "three water and four factors" is designed with three dimension parameters and longitudinal spacing. Numerical simulation is carried out under different airflow velocity. The variation of boundary layer thickness and pressure distribution study the drag reduction mechanism of non-smooth surface of variable oval pit by aerodynamic friction. Conclusion: 1. Variation oval non-smooth surface has a certain aerodynamic friction drag reduction effect compared with smooth surface. When the air flow velocity is 24 m / s, the drag reduction effect is 10%. The orthogonal experimental analysis shows that the influence of the four test factors on the drag reduction effect is arranged from large to small as follows: radius, pit depth, The surface of the variant oval pit increases the thickness of the boundary layer, decreases the velocity gradient near the wall and reduces the shear force, thus reducing the friction resistance.
【作者單位】： State
【基金】：Project supported by the National Natural Science Foundation of China(No.51375439)
【分類號(hào)】：O313.5

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