發(fā)布時(shí)間：2018-01-02 03:29

  本文關(guān)鍵詞：基于CFD的帶分流葉片離心風(fēng)泵結(jié)構(gòu)優(yōu)化研究　出處：《東南大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 離心風(fēng)泵 葉輪 分流葉片 數(shù)值計(jì)算 CFD

【摘要】：離心泵由于結(jié)構(gòu)簡(jiǎn)單、易于操作、運(yùn)行可靠、適用范圍廣等特點(diǎn),成為各種泵中應(yīng)用最為廣泛的一種,并且隨著社會(huì)經(jīng)濟(jì)的發(fā)展,對(duì)離心泵的性能提出了越來(lái)越高的要求,如偏工況穩(wěn)定運(yùn)行、低振動(dòng)噪聲以及高可靠性要求等。而在諸多離心泵優(yōu)化設(shè)計(jì)的方法中,添加分流葉片設(shè)計(jì)法是當(dāng)前離心泵設(shè)計(jì)方法中較為有效的方法之一。其采用了長(zhǎng)、短葉片間隔放置,從而有效改善葉輪內(nèi)部流場(chǎng)分布,提高葉輪壓比,防止二次流、回流、射流尾跡等不良現(xiàn)象的發(fā)生,提高離心泵性能和運(yùn)行穩(wěn)定性,是改善離心葉輪機(jī)械綜合性能的有效方法。本文運(yùn)用成熟的CFD商用軟件FLUENT14.5,以某款商用洗碗機(jī)內(nèi)離心風(fēng)泵為研究對(duì)象,通過(guò)數(shù)值計(jì)算的手段對(duì)比不同葉輪模型風(fēng)泵內(nèi)外性能,從分流葉片的周向分布,分流葉片長(zhǎng)度,分流葉片偏轉(zhuǎn)角度,長(zhǎng)葉片、分流葉片的數(shù)目這4個(gè)因素來(lái)研究分流葉片對(duì)整機(jī)性能的影響。本文首先根據(jù)離心風(fēng)泵模型各部件幾何結(jié)構(gòu)參數(shù),采用三維建模軟件PRO/E分別對(duì)該風(fēng)泵模型的各個(gè)組成部分建模,裝配完成后導(dǎo)入ICEM CFD進(jìn)行網(wǎng)格劃分。通過(guò)對(duì)比3種湍流模型計(jì)算成本及精度,最終選擇標(biāo)準(zhǔn)k-ε模型作為本文數(shù)值計(jì)算的湍流模型,分別對(duì)該離心風(fēng)泵在不同流量工況下進(jìn)行數(shù)值計(jì)算,并對(duì)比了實(shí)驗(yàn)與計(jì)算結(jié)果之間的風(fēng)壓-流量曲線,驗(yàn)證本文使用計(jì)算方法和計(jì)算模型的可靠性。本文利用數(shù)值模擬計(jì)算提供該離心風(fēng)泵內(nèi)部流場(chǎng)的信息,包括葉輪內(nèi)的壓力分布、湍動(dòng)能分布、相對(duì)速度分布等,通過(guò)這些內(nèi)部流場(chǎng)信息結(jié)合計(jì)算結(jié)果,以提高風(fēng)泵出口壓力及效率為優(yōu)化目標(biāo),來(lái)研究分流葉片各幾何參數(shù),如分流葉片周向分布,分流葉片長(zhǎng)度、偏轉(zhuǎn)角度及葉片數(shù)對(duì)整機(jī)性能的影響。最終得出使該離心風(fēng)泵具有最佳性能的各幾何參數(shù)的最優(yōu)取值。新設(shè)計(jì)出的新離心風(fēng)泵模型風(fēng)壓在全流量工況范圍內(nèi)相比原模型風(fēng)泵提高了8.7%,效率也提高了3.3%。本文運(yùn)用數(shù)值模擬計(jì)算的手段探討了分流葉片對(duì)離心風(fēng)泵內(nèi)部流場(chǎng)和性能的影響機(jī)理,其不受實(shí)驗(yàn)條件的限制,對(duì)今后離心泵的設(shè)計(jì)提供了理論參考。
[Abstract]:The centrifugal pump has the advantages of simple structure, easy operation, reliable operation, wide application range, has become one of the most widely used in all kinds of pumps, and with the development of social economy, put forward higher requirements on the performance of the centrifugal pump, such as partial condition of stable operation, low noise and high reliability etc. while in many centrifugal pump optimization design method, adding splitter blades design method is one of the effective method of the current design method of centrifugal pump. The long and short blade spacing, so as to improve the internal flow field distribution of impeller, improve the impeller pressure ratio, prevent the two flow, backflow, jet wake and other bad the occurrence of the phenomenon, improve the performance of centrifugal pump and the operation stability, is an effective method to improve the comprehensive performance of the centrifugal impeller machinery. This paper uses the mature commercial CFD software FLUENT14.5, using a commercial dishwasher centrifuge Air compressor as the research object, by means of comparing the different numerical model of air compressor impeller internal and external performance, from the splitter blade circumferential distribution, splitter blade length, splitter blade deflection angle, long blade, the 4 factors the number of splitter blades to study the influence on the performance of the splitter blade. Firstly, according to various parts of the centrifugal pump model the geometrical structure parameters, the 3D modeling software PRO/E of the air compressor model each part of the model, after the completion of the assembly into the ICEM CFD grid. By comparing the 3 kinds of turbulence model to calculate the cost and accuracy, the standard k- e turbulence model chosen as the numerical calculation model of the centrifugal pump, respectively in different flow conditions by numerical calculation, and compared the wind pressure between the experimental and calculated results of the flow curve, verify the use of the calculation method and model can be By simulation. This paper provides the information of the internal flow field of centrifugal pump including impeller using numerical pressure distribution in turbulent kinetic energy distribution, velocity distribution, the flow field information combined with the results, in order to improve the pump outlet pressure and efficiency as the optimization objective, to study the splitter blade geometry parameters, such as the splitter blades the circumferential distribution, length of splitter blades, influence of deflection angle and number of leaves on the performance of the optimal value. Finally the geometric parameters of the centrifugal pump which has the best performance of the new model. The new design pressure of centrifugal pump in the whole range of flow condition compared to the original model of air compressor is increased by 8.7%, but also improves the efficiency of 3.3%. this paper uses numerical simulation method to research mechanism of influence of splitter blades on the flow field and the performance of the centrifugal pump inside, the restriction of experimental conditions for the future from the The design of the heart pump provides a theoretical reference.

【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TH311

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 И.Р.克略寧,k，

本文編號(hào)：1367491