題目：Analysis of Turbulent Flows by Simultaneous Fluorescent and Mie-Scattering PIV
時間：2025年6月18日 9:30-11:00
地點(diǎn)：機(jī)械與動力工程學(xué)院 振華會議室
邀請人：彭迪 教授（葉輪機(jī)械研究所）
報(bào)告人簡介
Christian J. K?hler 博士是德國慕尼黑聯(lián)邦國防軍大學(xué)（Universit?t der Bundeswehr München）教授，現(xiàn)任該校流體力學(xué)與空氣動力學(xué)研究所所長。他目前擔(dān)任國際實(shí)驗(yàn)流體力學(xué)領(lǐng)域期刊《Experiments in Fluids》主編，并入選德國洪堡基金會評選委員會。他曾擔(dān)任2018年國際實(shí)驗(yàn)流體力學(xué)大會及2019年國際粒子圖像測速研討會等國際會議主席。Kahler教授的研究興趣廣泛，涵蓋光學(xué)流場診斷技術(shù)的發(fā)展與應(yīng)用，以及亞音速、跨音速、超音速條件下微流體與湍流中的復(fù)雜流動機(jī)理。其合著的第三版《Particlelmage Velocimetry》(粒子圖像測速技術(shù))專著已被引用超過8000次。
報(bào)告摘要
Many flows have a multi-constituent nature, where understanding the transfer of mass and momentum between different parts of the flow is key. While experiments in liquid media have long used flow tagging techniques such as dye injection to isolate parts of the flow, analogous methods that do not compromise full-field velocimetry in gas flows are highly impractical. The recent introduction of a solution of Pyrromethene 567 (P567) in Di-Ethyl-Hexyl-Sebacate (DEHS) to produce a seeding fluid capable of fluorescent emission in addition to Mie scattering promises to address this need. By locally seeding a secondary flow of interest with the modified DEHS, the fluorescent signal can be used for tagging; global seeding of main flow with standard DEHS, which only produces Mie scattering of incident laser light, is used to obtain full-field velocimetry with established PIV techniques. Performing morphological image processing and intensity-based thresholding on the fluorescent particle images yields a continuum representation of the secondary flow. This can then be combined with velocimetric information from PIV to conduct quantitative zonal analyses. This technique has been applied to the flow behind an active synthetic-jet turbulence grid and a turbulent boundary layer (TBL). With the new zonal decomposition capabilities offered, data relating to the intermittency of the flows, statistical structure of the phenomena, turbulent/non-turbulent interface (TNTI) and entrainment and detrainment can be extracted.
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