發(fā)布時間：2018-04-14 15:06

  本文選題：旋流器 + 螺旋流　； 參考：《太原理工大學(xué)》2014年碩士論文

【摘要】：為尋求一種平穩(wěn)的管道水力輸送方式,針對傳統(tǒng)的型料管道水力輸送進行了改進,以旋流器作為輸送物料的密閉容器,本論文是基于國家自然科學(xué)基金項目“管道縫隙螺旋流水力特性研究”(51109115)和國家自然科學(xué)基金項目“管道列車水力輸送能耗研究”(51179116),采用理論分析與模型試驗相結(jié)合的研究方法,分析了不同導(dǎo)葉長度的旋流器在運動時產(chǎn)生的螺旋流旋流特性。結(jié)果表明： 1.相同雷諾數(shù)下不同導(dǎo)葉長度的旋流器,在運動的過程中,隨著導(dǎo)葉長度的增加,管內(nèi)水流的壓強分布表現(xiàn)出先減小后增大的趨勢,其中導(dǎo)葉長度為l=0.5L的壓強值最�。浑S著導(dǎo)葉長度的增加,軸向速度表現(xiàn)為先減小后增大再減小的趨勢,周向速度表現(xiàn)為先增大后減小的趨勢。而且當(dāng)導(dǎo)葉的長度l=0.75L時,測試斷面的軸向流速的平均值最大,當(dāng)導(dǎo)葉長度l=0.5L時,測試斷面的周向速度平均值和徑向速度的平均值均最大。 2.對于同一型號的旋流器,雷諾數(shù)Re越大,測試斷面水流的壓力就越大,軸向速度也越大,而且流速梯度分布也越密集；周向速度隨雷諾數(shù)Re的增長幅度要大于徑向速度隨雷諾數(shù)Re的增長幅度。 3.在同種工況且旋流器的導(dǎo)葉高度和長度相同的情況下,測試斷面的壓強隨導(dǎo)葉的旋轉(zhuǎn)角度的增大而增大；軸向速度平均值也隨導(dǎo)葉的旋轉(zhuǎn)角度的增大而增大；當(dāng)旋流器位于測試斷面上游時,隨著旋流器導(dǎo)葉旋轉(zhuǎn)角度的增加,管道水流在測試斷面處其周向速度越大；而當(dāng)旋流器位于測試斷面下游時,則得到相反的結(jié)果；導(dǎo)葉的旋轉(zhuǎn)角度越大,測試斷面水流的徑向速度的絕對值越小。 4.在測試斷面的水平中心測孔上水流的軸向速度整體上表現(xiàn)為偏心的、非對稱的拋物線型分布；而且雷諾數(shù)越大,典型測孔的各測點的軸向速度隨之增大,而且增大的幅度也很大。當(dāng)旋流器位于測試斷面上游時,旋轉(zhuǎn)角度大的旋流器其測試斷面水平位置中心測孔的軸向速度平均值較大；而當(dāng)旋流器位于測試斷面的下游時,則相反。 5.在設(shè)計工況為Re=0.8x105的條件下,旋流器型號為0=5°、h=15mm、l=L時,其在整個管道系統(tǒng)運行過程中所消耗的單位能耗最小。而在設(shè)計工況為Re=1.1×105的條件下,則是旋流器型號為0=5°、h=15mm、l=0.75L時,其消耗的單位能耗相對較小。 本論文的研究成果對動邊界螺旋流理論和旋流器在實際生產(chǎn)中的應(yīng)用提供一定的理論依據(jù)。
[Abstract]:In order to find a stable pipeline hydraulic transportation mode, the traditional type material pipeline hydraulic transportation was improved, and the hydrocyclone was used as the closed vessel for conveying material.This paper is based on the project of National Natural Science Foundation of China "study on the force characteristics of helical income in pipeline gap" and the project of National Natural Science Foundation of China "study on Energy consumption of Pipeline Train hydraulic Transportation" (51179116), using theoretical analysis and model test phase.Combined research methods,The helical flow characteristics of the hydrocyclone with different guide vane lengths are analyzed.The results show that:1.With the increase of guide vane length, the pressure distribution of water flow in the hydrocyclone with the same Reynolds number decreases first and then increases with the increase of the guide vane length, and the pressure of the guide vane length is the smallest when the length of the guide vane is 0.5 L;With the increase of the length of the guide blade, the axial velocity decreases first and then increases and then decreases, and the circumferential velocity increases first and then decreases.When the length of the guide blade is 0.75 L, the average axial velocity of the test section is the largest, and when the length of the guide blade is 0.5 L, the average value of the circumferential velocity and the radial velocity of the test section are the largest.2.For the same type of hydrocyclone, the larger the Reynolds number re, the greater the pressure of water flow, the greater the axial velocity and the denser the velocity gradient distribution.The increase of circumferential velocity with Reynolds number re is larger than that of radial velocity with Reynolds number re.3.Under the same condition that the guide vane height and length of the same type cyclone are the same, the pressure of the test section increases with the increase of the rotating angle of the guide vane, and the average axial velocity increases with the increase of the rotating angle of the guide vane.When the hydrocyclone is located upstream of the test section, the circumferential velocity of the pipe flow increases with the increase of the rotating angle of the guide vane of the hydrocyclone, but the contrary results are obtained when the hydrocyclone is located downstream of the test section.The larger the rotating angle of the guide blade is, the smaller the absolute value of the radial velocity of the measured cross section is.4.In the horizontal center of the test section, the axial velocity of the flow is eccentric and asymmetrical parabola, and the larger the Reynolds number is, the more the axial velocity of the measured points increases.And the increase is also very large.When the hydrocyclone is located upstream of the test section, the axial velocity average of the central hole in the horizontal position of the test section is higher than that of the hydrocyclone with high rotation angle, but the opposite is true when the hydrocyclone is located downstream of the test section.5.When the design condition is Re=0.8x105, the unit energy consumption of the hydrocyclone is minimum when the type of cyclone is 0 ~ 5 擄/ h ~ (15) mm / L, and the unit energy consumption is minimum during the operation of the whole pipeline system.However, when the design condition is Re=1.1 脳 10 ~ 5, the unit energy consumption is relatively small when the hydrocyclone model is 0 ~ 5 擄/ h ~ (-1) 15mm / L.The research results of this paper provide some theoretical basis for the theory of moving boundary spiral flow and the application of hydrocyclone in practical production.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U171;TV134

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