本文關(guān)鍵詞：混流泵能量性能多參數(shù)優(yōu)化研究　出處：《江蘇大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 混流泵 能量性能 多參數(shù) 優(yōu)化設(shè)計(jì) 試驗(yàn)測試

【摘要】：混流泵在國民經(jīng)濟(jì)中應(yīng)用廣泛,高效混流泵水力模型的研發(fā)一直是水力機(jī)械領(lǐng)域重要和基礎(chǔ)的研究方向之一。本文以一臺比轉(zhuǎn)速為336的導(dǎo)葉式混流泵為研究對象,通過模型泵測試、數(shù)值計(jì)算和理論分析相結(jié)合的方法,提出了一種不改變?nèi)~輪出口名義直徑的混流泵能量性能多參數(shù)優(yōu)化方法,并進(jìn)行了試驗(yàn)驗(yàn)證。本文的主要工作及成果:1.在系統(tǒng)地歸納國內(nèi)外葉片泵內(nèi)流特性研究方法、優(yōu)化設(shè)計(jì)方法的基礎(chǔ)上,總結(jié)了常用的葉片泵水力優(yōu)化方法,并對神經(jīng)網(wǎng)絡(luò)和遺傳算法的研究現(xiàn)狀作了介紹。2.設(shè)計(jì)加工了模型泵并進(jìn)行了性能測試,包括外特性、壓力脈動及振動特性試驗(yàn),測試結(jié)果表明:(1)與設(shè)計(jì)要求相比,模型泵效率低了3.92個(gè)百分點(diǎn),揚(yáng)程低了1.9 m,性能需要優(yōu)化;(2)與設(shè)計(jì)工況相比,非設(shè)計(jì)工況的脈動情況較為紊亂,各監(jiān)測點(diǎn)在一定的頻率范圍內(nèi)均有不同程度的振蕩;(3)葉輪進(jìn)出口處振動均以X方向?yàn)橹?Y、Z方向的振動情況隨工況增加變化不大,葉輪出口振動幅值較大,X、Y、Z三個(gè)方向分別比葉輪進(jìn)口的振動速度幅值高6.78%、5.86%、7.73%。3.提出了一種不改變?nèi)~輪出口名義直徑的混流泵性能多參數(shù)優(yōu)化方法:(1)選取葉輪的葉片出口邊傾斜角θ、葉片后蓋板包角φ、葉片中間流線進(jìn)口安放角β1、葉片中間流線出口安放角β2、葉片出口寬度l、前蓋板傾角T1、后蓋板傾角T2、葉片數(shù)z等8個(gè)參數(shù)作為優(yōu)化變量;(2)采用RBF神經(jīng)網(wǎng)絡(luò)模型建立混流泵性能預(yù)測模型,其中訓(xùn)練及檢驗(yàn)的樣本點(diǎn)由正交試驗(yàn)和CFD數(shù)值計(jì)算方法確定;(3)應(yīng)用多島遺傳算法對預(yù)測模型進(jìn)行求解,從而建立了一種不改變?nèi)~輪出口名義直徑的混流泵性能多參數(shù)優(yōu)化方法。采用該方法對模型泵能量性能進(jìn)行了優(yōu)化,數(shù)值計(jì)算結(jié)果表明:優(yōu)化后模型泵性能得到顯著提升,在設(shè)計(jì)流量點(diǎn),效率提高了4.39個(gè)百分點(diǎn),達(dá)到了85.24%,揚(yáng)程也提升了14.6%。4.對優(yōu)化后模型泵的外特性、壓力脈動及振動特性進(jìn)行了試驗(yàn)測試,并基于CFD結(jié)果對比了優(yōu)化前后模型泵的內(nèi)流變化,結(jié)果表明:(1)在設(shè)計(jì)點(diǎn),優(yōu)化后泵揚(yáng)程和效率分別提高了11.5%和4.32個(gè)百分點(diǎn);(2)1.0 Qd工況下,優(yōu)化后泵進(jìn)口、葉輪出口、導(dǎo)葉出口、泵出口的壓力脈動峰峰值分別降低了62.9%、37.5%、28.57%、62.5%;(3)設(shè)計(jì)工況下,優(yōu)化后葉輪進(jìn)口法蘭T1測點(diǎn)X、Y、Z方向的振動速度幅值分別減小了12.2%、14.28%、25%;葉輪出口法蘭T2測點(diǎn)X、Y、Z方向的振動速度幅值分別減小了4.71%、9.52%、35.29%;(4)優(yōu)化后導(dǎo)葉內(nèi)揚(yáng)程損失降低了1.23%,在原模型導(dǎo)葉中間截面發(fā)生回流及低速區(qū)域有所改善且優(yōu)化后葉輪葉片背面的低壓區(qū)域壓力有所提高,有效抑制了壓差引起的不穩(wěn)定流動。
[Abstract]:Mixed flow pump is widely used in national economy. The research and development of hydraulic model of high efficiency mixed flow pump has been one of the important and basic research directions in the field of hydraulic machinery. In this paper, a guide vane mixed flow pump with specific speed of 336 is taken as the research object, and the model pump is tested. Based on the combination of numerical calculation and theoretical analysis, a multi-parameter optimization method for the energy performance of a mixed-flow pump without changing the nominal diameter of the impeller outlet is proposed. The main work and result of this paper are as follows: 1. On the basis of systematically summarizing the research methods of internal flow characteristics and optimization design of vane pumps at home and abroad, the commonly used hydraulic optimization methods of vane pumps are summarized. The research status of neural network and genetic algorithm is introduced. 2. The model pump is designed and manufactured, and its performance is tested, including external characteristics, pressure pulsation and vibration characteristics. The test results show that compared with the design requirements, the efficiency of the model pump is 3.92% lower, the lift is 1.9 m lower, and the performance of the model pump needs to be optimized. (2) compared with the design condition, the pulsation of the off-design condition is more disordered, and each monitoring point has different degrees of oscillation in a certain frequency range; 3) the vibration at the inlet and outlet of the impeller is mainly in the direction of X direction and the vibration in the direction of YJ Z has little change with the increase of working conditions, and the amplitude of vibration at the outlet of the impeller is larger than that at the outlet of the impeller. The amplitude of vibration velocity in the three directions of Z is 6.78% higher than that in the inlet of impeller, respectively, and 5.86% higher than that of impeller inlet. 7.73 / 3.A multi-parameter optimization method of mixed flow pump performance, which does not change the nominal diameter of impeller outlet, is proposed. The blade exit angle 胃 and the back cover angle 蠁 are selected. Eight parameters, such as inlet angle 尾 1, outlet angle 尾 2, outlet width l, front cover dip angle T 1, back cover plate inclination angle T 2 and blade number z, were used as optimization variables. (2) the performance prediction model of mixed flow pump is established by using RBF neural network model, in which the sample points of training and inspection are determined by orthogonal test and CFD numerical calculation method. 3) using multi-island genetic algorithm to solve the prediction model. Thus, a multi-parameter optimization method for the performance of the mixed flow pump without changing the nominal diameter of the impeller outlet is established, and the energy performance of the model pump is optimized by this method. The results of numerical calculation show that the performance of the model pump has been improved significantly after the optimization, and the efficiency of the model pump has been improved by 4.39 percentage points to 85.24% percentage points at the design flow point. The external characteristics, pressure pulsation and vibration characteristics of the optimized model pump are tested, and the internal flow changes of the model pump before and after optimization are compared based on the CFD results. The results show that at the design point, the pump head and efficiency are increased by 11.5% and 4.32 percentage points, respectively. Under the condition of 1.0 Qd, the peak value of pressure pulsation at the pump inlet, impeller outlet, guide vane outlet and pump outlet were reduced by 62.9% and 37.5% respectively. 62.5; (3) under the design condition, the vibration velocity amplitude in the direction of the T1 measuring point of the inlet flange of the impeller has been reduced by 12.2and 14.28, and the amplitude of the vibration velocity in the direction of XY _ (Z) has been reduced respectively. The amplitude of vibration velocities in the direction of X _ (Y) Z at the T _ 2 measuring point of impeller outlet flange decreases 4.71% and 9.52% 35.29% respectively; (4) after optimization, the loss of the inner head of the guide vane is reduced by 1.23, and the pressure of the low pressure area on the back of the impeller blade is improved in the middle section and the low speed area of the original model. The unstable flow caused by pressure difference is effectively restrained.
【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH313

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