(中南大學(xué) 資源與安全工程學(xué)院，長沙 410083)
摘 要: 針對泡沫砂漿三相流管道輸送特性研究問題，以國內(nèi)某鉛鋅礦為研究對象，運(yùn)用計(jì)算流體力學(xué)(CFD)技術(shù)建立泡沫砂漿W型管長距離管道輸送性能研究3D數(shù)值分析模型。在室內(nèi)塌落度和流變特性試驗(yàn)的基礎(chǔ)上，對不同配比及不同充填能力料漿輸送中管道和彎管處壓力、速度進(jìn)行CFD模擬分析。結(jié)果表明：泡沫砂漿三相流可有效降低管道輸送阻力，較普通兩相流充填砂漿具有更好的流動性；通過彎管處壓力、速度模擬可得，管道內(nèi)壓力、速度最大值點(diǎn)由管道中心線向管道內(nèi)下側(cè)方偏移，彎管處最大速度3.8 m/s，滿足穩(wěn)定性要求；當(dāng)氣泡率為10%、灰砂比為1:6、質(zhì)量分?jǐn)?shù)為72%、流量為60 m3/h時(shí)管道阻力最小為2.33 MPa，彎管處阻力最小為3.22 kPa，滿足自流輸送要求，為最佳配比方案。CFD技術(shù)能夠?yàn)楣艿垒斔脱芯刻峁┲庇^準(zhǔn)確的依據(jù)，在流體流變特性和降阻方法創(chuàng)新方面還有更為廣闊的應(yīng)用空間。
關(guān)鍵字: 泡沫砂漿；W形管；長距離；管道輸送特性；計(jì)算流體力學(xué)；氣泡率
（School of Resources and Safety Engineering, Central South University, Changsha 410083, China）
Abstract:A three-dimensional model, W type and long distance backfilling pipeline transportation model was developed by the computational fluid dynamics technology (CFD), which was used to study the pipeline transportation properties of three-phase flow foam slurry. Based on the laboratory slump and rheological properties test, the pressure and velocity of pipeline and elbow were studied by CFD under different ratios and backfilling ability. The results show that, the three-phase flow foam slurry can effectively reduce the pipeline transportation resistance and has better liquidity than ordinary slurry. Furthermore, at the elbow, the maximum pressure and velocity transfer to the lower side of the pipe from the pipe center, and the maximum velocity is 3.8 m/s, meeting the stability requirements. The best proportioning scheme is the bubble rate of 10%, the cement sand ratio of 1:6, the mass fraction of 72% and the backfilling ability of 60 m3/h. The resistance at pipeline and elbow are 2.33 and 3.22 kPa, respectively, and it can realize the self-flowing transportation. CFD technology is good at providing intuitive and accurate basis for pipeline transportation research, and would have a wider application space in the study of fluid rheological properties and resistance reduction methods.
Key words: foam slurry; W type pipeline; long distance; transportation property; computational fluid dynamics; bubble rate
