發(fā)布時(shí)間：2018-10-31 14:38

【摘要】：采用粒子成像速度場(chǎng)儀(PIV)和數(shù)值模擬(CFD)對(duì)Taylor-Couette流場(chǎng)進(jìn)行測(cè)量,獲得各轉(zhuǎn)速下渦流場(chǎng)信息。將同等條件下PIV測(cè)量結(jié)果與數(shù)值模擬結(jié)果相聯(lián)系,對(duì)比分析不同旋轉(zhuǎn)雷諾數(shù)范圍內(nèi)渦流場(chǎng)中不同徑線和中軸線上各向速度的變化特征。結(jié)果表明,各種特征存在一定的轉(zhuǎn)速分段范圍:在2~7r/min(Re為100~350)時(shí),各向速度特征為層流渦特性,在7~40r/min(Re為350~2000)時(shí),各向速度特征為波狀渦特性,在40~60r/min(Re為2000~3000)時(shí),各向速度特征為調(diào)制波狀渦特性,當(dāng)轉(zhuǎn)速大于60r/min(Re大于3000)時(shí),各向速度特征為湍流渦特性。根據(jù)不同角度獲得的各向速度特征對(duì)應(yīng)的內(nèi)筒轉(zhuǎn)速、旋轉(zhuǎn)雷諾數(shù)與流場(chǎng)渦形態(tài)的關(guān)系,明確分析出特定幾何條件下,泰勒渦發(fā)生形態(tài)轉(zhuǎn)變的旋轉(zhuǎn)雷諾數(shù),以便于深入探究泰勒渦流場(chǎng)的特性,定量分析渦運(yùn)動(dòng)形態(tài)特征。
[Abstract]:Particle imaging velocimeter (PIV) and numerical simulation (CFD) were used to measure the flow field of Taylor-Couette. The results of PIV measurements under the same conditions are correlated with the results of numerical simulation, and the variation characteristics of the velocities of different tracks and axes in the eddy current field in the range of different rotational Reynolds numbers are compared and analyzed. The results show that there is a certain speed segmented range of the various characteristics: when 2~7r/min (Re is 100,350), the velocity characteristics of each direction are laminar vortex characteristics, and in the case of 7~40r/min (Re = 350 ~ 2000), the velocity characteristics of each direction are wavy vortex characteristics. When 40~60r/min (Re = 2000000), the velocity characteristic of each direction is the characteristic of modulated wave vortex, and when the rotational speed is larger than 60r/min (Re > 3000), the characteristic of each direction velocity is turbulent vortex characteristic. According to the relationship between the rotational speed of the inner cylinder, the rotational Reynolds number and the vortex shape of the flow field obtained from different angles, the rotational Reynolds number of the Taylor vortex-generating morphology transformation under certain geometric conditions is clearly analyzed. It is convenient to probe into the characteristics of Taylor eddy current field and to quantitatively analyze the characteristics of vortex motion.
【作者單位】： 蘭州交通大學(xué)環(huán)境與市政工程學(xué)院;甘肅省建筑設(shè)計(jì)研究院;
【基金】：國(guó)家自然科學(xué)基金(51268025,51468029)資助 甘肅省自然科學(xué)基金項(xiàng)目(145RJZA131)
【分類號(hào)】：O35
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本文編號(hào)：2302560