發(fā)布時(shí)間：2018-07-04 09:53

  本文選題：沙塵天氣 + 實(shí)驗(yàn)平臺(tái)��； 參考：《華北電力大學(xué)》2017年碩士論文

【摘要】：特高壓輸電由于輸電能力強(qiáng)、路線能耗小等優(yōu)勢(shì)具有廣闊的發(fā)展前景。然而,西北地區(qū)高海拔和沙塵環(huán)境會(huì)影響特高壓輸電線路的電暈特性,進(jìn)而影響電網(wǎng)的安全有序運(yùn)行。因此,研制沙塵天氣模擬實(shí)驗(yàn)平臺(tái)可為實(shí)驗(yàn)研究輸電線路電暈特性奠定物質(zhì)基礎(chǔ)。本文闡述了氣固兩相流的基本理論,根據(jù)電暈實(shí)驗(yàn)對(duì)沙塵環(huán)境的需求確定了其實(shí)驗(yàn)參數(shù),在此基礎(chǔ)上設(shè)計(jì)了自由落沙、旋流擴(kuò)散和類平拋擴(kuò)散三種方案下的沙塵天氣模擬實(shí)驗(yàn)平臺(tái)。采用理論分析和數(shù)值模擬相結(jié)合的方法,對(duì)上述方案在不同風(fēng)速及顆粒粒徑下的顆粒擴(kuò)散區(qū)域進(jìn)行了對(duì)比分析,以探尋既能滿足實(shí)驗(yàn)需求又操控方便的方案并確定之。從縮短管路總長和降低管路壓損兩個(gè)角度,對(duì)已初步確定的旋流擴(kuò)散方案實(shí)驗(yàn)平臺(tái)進(jìn)行了優(yōu)化設(shè)計(jì);并對(duì)該優(yōu)化后實(shí)驗(yàn)平臺(tái)在不同的給沙率、顆粒粒徑和風(fēng)速下的顆粒擴(kuò)散情況進(jìn)行了研究,以獲得實(shí)驗(yàn)區(qū)域的沙塵濃度特性;對(duì)該優(yōu)化后實(shí)驗(yàn)平臺(tái)中的風(fēng)機(jī)和給料器以及控制、測(cè)量和支撐等裝置進(jìn)行選型設(shè)計(jì)以利其工程化,并實(shí)驗(yàn)研究了給料器的給料特性。研究結(jié)果表明:1)旋流擴(kuò)散方案的實(shí)驗(yàn)平臺(tái)既滿足實(shí)驗(yàn)需求且又操控方便;2)優(yōu)化后實(shí)驗(yàn)平臺(tái)其上下直管長度均為2m,前后導(dǎo)流器開度均為30?,給料管距前級(jí)導(dǎo)流器的軸向距離為0.5m,給料口縱向位于風(fēng)管軸心,此時(shí)壓損系數(shù)與未優(yōu)化前相比減小0.25;3)優(yōu)化后實(shí)驗(yàn)平臺(tái)可滿足不同工況下距風(fēng)管出口4m,縱向標(biāo)高為6.72m的實(shí)驗(yàn)區(qū)域3?3m2的沙塵覆蓋,且沙塵濃度精確可控;4)在給沙率、風(fēng)速和顆粒粒徑分別為(0.005~0.03)kg/s、(6~9)m/s和(0.125和0.25)mm的情況下,優(yōu)化后實(shí)驗(yàn)平臺(tái)在實(shí)驗(yàn)區(qū)域內(nèi)的沙塵濃度隨風(fēng)速增加先增后減,且0.125mm和0.25mm粒徑下的拐點(diǎn)對(duì)應(yīng)風(fēng)速分別為7m/s和8m/s;沙塵濃度增幅隨給沙率增加而增加;5)給料器給料率與給料器頻率基本呈線性關(guān)系。
[Abstract]:UHV transmission has a broad development prospect because of its strong transmission capacity and low energy consumption. However, the high altitude and dust environment in Northwest China will affect the corona characteristics of UHV transmission lines, and then affect the safe and orderly operation of the power grid. Therefore, the development of sand and dust weather simulation experimental platform can lay a material foundation for the experimental study of corona characteristics of transmission lines. In this paper, the basic theory of gas-solid two-phase flow is described, and the experimental parameters are determined according to the requirements of the corona experiment for the sand and dust environment. On this basis, the free sediment dropping is designed. The experimental platform of sand and dust weather simulation under three schemes of swirl diffusion and flat throwing diffusion. By using the method of theoretical analysis and numerical simulation, the particle diffusion regions under different wind speeds and particle sizes are compared and analyzed in order to find out a scheme that can meet the experimental requirements and control conveniently. From two angles of shortening the total length of pipeline and reducing the pressure loss of pipeline, the experimental platform of swirl diffusion scheme that has been preliminarily determined has been optimized and designed, and the experimental platform has been optimized for different sand feeding rates after the optimization. The particle size and particle diffusion under wind speed were studied to obtain the dust concentration characteristics in the experimental area, and the fan and feeder in the optimized experimental platform and its control were obtained. The measuring and supporting devices were selected and designed for engineering, and the feeding characteristics of the feeder were studied experimentally. The results show that the experimental platform of the swirl diffusion scheme not only meets the experimental requirements but also has convenient operation. The optimized experimental platform has a straight tube length of 2 m, an opening of both front and rear conductors, and a feed tube distance from the axis of the front stage guide. The direction distance is 0.5 m, the feed port is located longitudinally on the axis of the air pipe, At this time, the pressure loss coefficient is reduced by 0.25m3 compared with that before optimization. After the optimization, the experimental platform can satisfy the dust coverage of 3?3m2 in the experimental area with a longitudinal elevation of 6.72m and 4m from the outlet of the wind pipe under different operating conditions, and the dust concentration is accurately controlled. When the wind speed and particle size were (0.005 ~ 0.03) kg / s, (6 ~ 9) m / s and (0.125) mm, respectively, the dust concentration in the experimental area increased first and then decreased with the increase of wind speed. The inflection points of 0.125mm and 0.25mm particle size are 7m/s and 8m / s, respectively, and the increase of dust concentration increases with the increase of sand feed rate. (5) the feed rate of the feeder has a linear relationship with the frequency of the feeder.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM75

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本文編號(hào)：2095680