本文選題：礦井通風(fēng) + 突擴(kuò)巷道　； 參考：《礦業(yè)安全與環(huán)�！�2017年06期

【摘要】：為探究突擴(kuò)巷道斷面風(fēng)速分布規(guī)律,準(zhǔn)確確定流場(chǎng)回流區(qū)邊界,利用粒子圖像測(cè)速儀(PIV)對(duì)矩形均直突擴(kuò)巷道流場(chǎng)進(jìn)行測(cè)試,并對(duì)不同突擴(kuò)比和不同入口風(fēng)速條件下突擴(kuò)流場(chǎng)進(jìn)行數(shù)值模擬。研究結(jié)果表明:風(fēng)流經(jīng)過突擴(kuò)巷道后流線由平滑直線發(fā)生突變,在突擴(kuò)位置后上下隅角形成回流旋渦區(qū),回流區(qū)域負(fù)值風(fēng)速的存在使得回流區(qū)內(nèi)速度分布呈現(xiàn)"Ω"型,隨著距離的增加速度分布逐漸趨于穩(wěn)定并呈"∩"型,斷面風(fēng)速由"Ω"型分布向"∩"型分布的過渡位置即為突擴(kuò)巷道流場(chǎng)回流區(qū)邊界位置;在風(fēng)速0.1~2.5 m/s內(nèi),回流區(qū)邊界位置隨著風(fēng)速的增大有較大變化,而在風(fēng)速2.5~25.0 m/s內(nèi),回流區(qū)位置隨風(fēng)速的增大變化較小;當(dāng)風(fēng)速一定時(shí),回流區(qū)邊界位置隨著突擴(kuò)比的增大而距突擴(kuò)過渡面越遠(yuǎn),即回流區(qū)越長。
[Abstract]:In order to investigate the distribution of wind velocity in the section of the tunnel with sudden expansion and determine the boundary of the flow field, the particle image velocimeter (PIV) was used to test the flow field of the rectangular tunnel. Numerical simulation of sudden expansion flow field under different sudden expansion ratio and different inlet wind speed is carried out. The results show that the flow line changes from a smooth straight line after the wind flow passes through the sudden expansion roadway, and the circumfluence vortex region is formed in the upper and lower corner after the sudden expansion position. The negative wind speed in the backflow region makes the velocity distribution of the backflow zone appear "惟" type. With the increase of the distance, the velocity distribution tends to be stable and presents a "鈮，

本文編號(hào)：1860038