本文選題：雙吸離心泵 + 非均勻入流��； 參考：《西安理工大學(xué)》2017年碩士論文

【摘要】：對(duì)離心泵而言,良好的入流是保證整泵水力性能的重要因素,然而在離心泵的實(shí)際運(yùn)行中,往往存在由于安裝空間受限而導(dǎo)致的入口管路彎曲、進(jìn)口回流及預(yù)旋等非均勻入流,從而造成了離心泵“設(shè)計(jì)過程中的均勻入流”和“實(shí)際運(yùn)行中的非均勻入流”之間的矛盾。本文基于雙吸離心泵的實(shí)際工程應(yīng)用,分析在入口管路彎曲所引起的入流非均勻情況下的泵內(nèi)部流動(dòng)特性,為提高雙吸離心泵的實(shí)際運(yùn)行效率與安全穩(wěn)定性提供借鑒,為促進(jìn)離心泵工程應(yīng)用領(lǐng)域的節(jié)能降耗開拓新思路。首先,搭建了雙吸離心泵壓力脈動(dòng)試驗(yàn)臺(tái),對(duì)均勻入流條件下的雙吸離心泵進(jìn)行外特性試驗(yàn),并采用高頻動(dòng)態(tài)壓力傳感器對(duì)蝸殼各測點(diǎn)及進(jìn)、出口管處的壓力脈動(dòng)進(jìn)行測量與分析;對(duì)均勻入流條件下雙吸離心泵模型進(jìn)行數(shù)值模擬,內(nèi)容與試驗(yàn)中保持一致,對(duì)比分析模擬計(jì)算結(jié)果與試驗(yàn)結(jié)果發(fā)現(xiàn):(1)該雙吸離心泵試驗(yàn)與數(shù)值模擬得到的外特性趨勢一致;(2)蝸殼內(nèi)壓力脈動(dòng)主頻為葉頻,且在隔舌處的壓力脈動(dòng)最為強(qiáng)烈;(3)在小流量工況下,試驗(yàn)中出現(xiàn)了主頻為2.6倍葉頻的壓力脈動(dòng)。模擬計(jì)算結(jié)果與試驗(yàn)結(jié)果基本一致,在此基礎(chǔ)上,對(duì)雙吸離心泵進(jìn)行非均勻入流下內(nèi)部流動(dòng)的數(shù)值模擬研究。其次,對(duì)水平及豎直彎管兩種非均勻入流管路進(jìn)行建模,對(duì)非均勻入流下的雙吸離心泵進(jìn)行定常計(jì)算,主要對(duì)進(jìn)口法蘭處的流動(dòng)非均勻性、外特性、葉輪內(nèi)部及進(jìn)出口截面的流動(dòng)進(jìn)行分析,研究結(jié)果表明:(1)雙吸離心泵在非均勻入流管路下運(yùn)行時(shí),泵揚(yáng)程及效率均下降,水平彎管對(duì)泵性能的影響高于豎直彎管;(2)雙吸離心泵非均勻入流對(duì)葉輪進(jìn)、出口截面的流速、靜壓和湍動(dòng)能分布產(chǎn)生了較大影響;(3)水平彎管入流下,揚(yáng)程及效率最大下降幅值分別為0.48m和1.02%; (4)在水平彎管入流時(shí),雙吸離心泵兩側(cè)葉輪入流流量存在差異,這種差異在葉輪內(nèi)部只出現(xiàn)在部分流道;在設(shè)計(jì)工況下,雙吸葉輪兩側(cè)流量的不均勻性使葉輪產(chǎn)生了大小為50. 2N的軸向力。最后,對(duì)非均勻入流條件下的雙吸離心泵進(jìn)行非定常計(jì)算,分別對(duì)蝸殼內(nèi)壓力脈動(dòng)及軸向力進(jìn)行分析,研究結(jié)果表明:(1)泵非均勻入流主要引起軸頻壓力脈動(dòng)的大幅上升,并伴隨葉頻壓力脈動(dòng)的小幅上升,在隔舌位置的壓力脈動(dòng)幅值上升最大;(2)葉輪兩側(cè)入流的流量差異并不會(huì)引起葉輪兩側(cè)壓力脈動(dòng)的較大變化。(3)非均勻入流會(huì)嚴(yán)重改變?nèi)~輪軸向力的分布規(guī)律,并導(dǎo)致軸向力脈動(dòng)幅值大幅增加。
[Abstract]:For centrifugal pumps, good inlet flow is an important factor to ensure the hydraulic performance of the whole pump. However, in the actual operation of centrifugal pumps, there are often inhomogeneous inflow flows, such as inlet pipe bending, inlet reflux and pre-rotation, which are caused by limited installation space, etc. Thus, the contradiction between "uniform inflow in the design process" and "non-uniform inflow in actual operation" of centrifugal pump is caused. Based on the practical engineering application of double suction centrifugal pump, this paper analyzes the internal flow characteristics of the pump under the condition of non-uniform inlet flow caused by the bending of the inlet pipe, which provides a reference for improving the practical operation efficiency and safety and stability of the double suction centrifugal pump. In order to promote the application of centrifugal pump engineering energy saving and consumption reduction new ideas. First of all, a double suction centrifugal pump pressure pulsation test bench is set up to test the external characteristics of double suction centrifugal pump under the condition of uniform inflow, and the high frequency dynamic pressure sensor is used to measure and enter the volute. The pressure pulsation at the outlet pipe is measured and analyzed, and the numerical simulation of the double suction centrifugal pump model under the condition of uniform inlet flow is carried out, which is consistent with the experimental results. The results of comparison and analysis show that: (1) the external characteristic of the double suction centrifugal pump is the same as that of the numerical simulation; (2) the main frequency of pressure pulsation in the volute is the frequency of the blade. The pressure pulsation is the strongest in the tongue septum. (3) under the condition of small flow rate, the pressure pulsation of the main frequency is 2.6 times of the blade frequency. The simulation results are in good agreement with the experimental results. On this basis, the numerical simulation of the internal flow of the double suction centrifugal pump under non-uniform inflow is carried out. Secondly, two kinds of non-uniform inlet pipes, horizontal and vertical, are modeled, and the steady calculation of double suction centrifugal pump under non-uniform flow is carried out, mainly for the flow non-uniformity and external characteristics of the inlet flange. The flow inside the impeller and the inlet and outlet section is analyzed. The results show that: (1) when the double suction centrifugal pump operates under the non-uniform inlet line, the pump head and efficiency are decreased. The influence of horizontal elbow on pump performance is higher than that of vertical bend; (2) the non-uniform inflow of double suction centrifugal pump has a great effect on the velocity of flow, static pressure and turbulent kinetic energy distribution of impeller inlet and outlet section; (3) the distribution of turbulent kinetic energy and static pressure in the inlet and outlet sections of the double suction centrifugal pump. The maximum drop amplitudes of lift and efficiency are 0.48m and 1.02m respectively. (4) the inlet flow rate of impeller on both sides of double suction centrifugal pump is different when the horizontal bend pipe flows in, and the difference only occurs in some channels inside the impeller. The inhomogeneity of the flow on both sides of the double suction impeller causes the impeller to produce a size of 50. The axial force of 2N. Finally, the unsteady calculation of double suction centrifugal pump under the condition of non-uniform inflow is carried out, and the pressure pulsation and axial force in the volute are analyzed respectively. The results show that: (1) the non-uniform inflow of the pump mainly causes the increase of axial frequency pressure pulsation. Accompanied by a small increase in the pressure pulsation of the leaf frequency, The amplitude of pressure pulsation in the position of tongue separation is the biggest, (2) the difference of inlet flow on both sides of impeller does not cause the great change of pressure fluctuation on both sides of impeller. (3) the distribution of axial force of impeller will be changed seriously by non-uniform inflow. The amplitude of axial force pulsation is greatly increased.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH311

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