本文選題：槽道流 + 非定常流場(chǎng)�。� 參考：《儀器儀表學(xué)報(bào)》2017年03期

【摘要】：針對(duì)槽道內(nèi)非定常流場(chǎng)的脈動(dòng)程度是影響傳質(zhì)、傳熱的效率問(wèn)題,通過(guò)構(gòu)建2DPIV測(cè)量非定常流場(chǎng)瞬態(tài)速度矢量場(chǎng)的實(shí)驗(yàn)系統(tǒng),分析了2DPIV測(cè)量的各個(gè)時(shí)刻矢量場(chǎng)和渦量分布的形態(tài),獲取了非定常流場(chǎng)的循環(huán)周期和頻率;利用本征正交分解(POD)技術(shù)分解了2DPIV的測(cè)量非定常流場(chǎng)的瞬態(tài)速度矢量場(chǎng),根據(jù)各個(gè)模態(tài)的能量比,選取前16階模態(tài)作為非定常流場(chǎng)的主導(dǎo)結(jié)構(gòu)模態(tài),并對(duì)POD分解的前16階模態(tài)系數(shù)進(jìn)行功率譜分析;結(jié)果表明POD分解的低階模態(tài)分別表征了非定常流場(chǎng)的基頻和相應(yīng)的倍頻,闡明了非定常流場(chǎng)的脈動(dòng)機(jī)理;非定常流場(chǎng)的脈動(dòng)是由于一些渦列和余弦形式的波狀主流形成的,并將這些渦列以及伴隨的波狀主流的脈動(dòng)頻率映射到POD分解的低階主導(dǎo)模態(tài)系數(shù)上。
[Abstract]:In view of the fact that the pulsation degree of unsteady flow field in channel is the efficiency of mass transfer and heat transfer, an experimental system for measuring transient velocity vector field of unsteady flow field by 2DPIV is constructed, and the patterns of vector field and vorticity distribution at different times measured by 2DPIV are analyzed. The cycle period and frequency of the unsteady flow field are obtained, and the transient velocity vector field of the unsteady flow field measured by 2DPIV is decomposed by the eigenorthogonal decomposition technique, according to the energy ratio of each mode. The first 16 modes are selected as the dominant structural modes of the unsteady flow field, and the power spectrum analysis of the first 16 order modal coefficients of the POD decomposition is carried out. The results show that the low order modes of the POD decomposition represent the fundamental frequency and the corresponding doubling frequency of the unsteady flow field, respectively. The pulsation mechanism of unsteady flow field is explained. The pulsation frequencies of these vortices and the accompanying waves are mapped to the low order dominant modal coefficients of the POD decomposition.
【作者單位】： 重慶工商大學(xué)廢油資源化技術(shù)與裝備工程研究中心;
【基金】：國(guó)家自然科學(xué)基金(51375516) 重慶基礎(chǔ)與前沿研究(cstc2016jcyj A0185)項(xiàng)目資助
【分類號(hào)】：O35

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