【摘要】：改革開放以來,隨著國民經(jīng)濟的迅速發(fā)展,能源工業(yè)得到長足的發(fā)展,我國逐漸成為能源生產(chǎn)和消費大國,機械設(shè)備和技術(shù)尤其是工業(yè)用泵的技術(shù)在不斷的發(fā)展和進步。 在成為能源生產(chǎn)和消費大國的同時,能源和環(huán)境問題的日趨嚴重,低碳經(jīng)濟、節(jié)能環(huán)保已成為經(jīng)濟發(fā)展中的必然要求。目前各個領(lǐng)域?qū)φ脊I(yè)用泵很大比重的離心泵的要求越來越高。CFD技術(shù)的應(yīng)用使得人們在研發(fā)和優(yōu)化離心泵過程中節(jié)省了大量的時間和經(jīng)濟成本,有效地提高了項目的產(chǎn)能,同時也在一定程度上解決了能源環(huán)境問題,該應(yīng)用技術(shù)已成為新世紀的重要研發(fā)方向。本文主要工作和成果如下： 1.在查閱大量文獻的基礎(chǔ)上,詳細綜述了計算流體動力學發(fā)展現(xiàn)狀、離心泵CFD數(shù)值模擬研究現(xiàn)狀和離心泵優(yōu)化方法的發(fā)展進程。并且還選擇了適用于CQB65-50-160F離心泵內(nèi)流場數(shù)值模擬的求解方法與湍流模型。 2.通過三維建模軟件Pro/e對CQB65-50-160F離心泵內(nèi)流場過流區(qū)域進行實體建模,利用Fluent前處理軟件Gambit對模型進行網(wǎng)格劃分。 3.依據(jù)選取的求解方法、湍流模型和實際工作情況對Fluent軟件進行一系列設(shè)置,并完成了離心泵的整機非定常數(shù)值模擬。在比較各文獻中圓盤摩擦損失公式和容積損失公式的基礎(chǔ)上,確定了適用于本文離心泵的損失公式,并對數(shù)值模擬結(jié)果進行修正得到各工況下?lián)P程、軸功率、效率值。依據(jù)修正后所得的各性能參數(shù)與試驗數(shù)據(jù)進行比較來分析各工況離心泵內(nèi)流場,得出在標況下數(shù)值模擬結(jié)果精度較高。 4.根據(jù)以上的分析以及大量參考文獻的查閱,提出了以壓水室為研究對象的新的優(yōu)化方法,且構(gòu)造了以總效率值最高為目標的優(yōu)化函數(shù)以及各未知參數(shù)的約束條件。利用遺傳算法和Matlab軟件尋優(yōu)求解得到了優(yōu)化后的壓水室?guī)缀螀?shù),進而對壓水室模型進行修改并對整機離心泵進行非定常數(shù)值模擬。最終結(jié)果表明,優(yōu)化后的離心泵在標況下總效率值提高了3.858%,實現(xiàn)了優(yōu)化目標和節(jié)能要求。
[Abstract]:Since the reform and opening up, with the rapid development of the national economy, the energy industry has been greatly developed, China has gradually become a large country of energy production and consumption, machinery and equipment and technology, especially the technology of industrial pumps are constantly developing and improving. As a large country of energy production and consumption, energy and environment problems are becoming more and more serious. Low-carbon economy, energy saving and environmental protection have become the inevitable requirements of economic development. At present, the demand for centrifugal pumps, which account for a large proportion of industrial pumps, is increasingly demanding in all fields. The application of CFD technology has made people save a lot of time and economic costs in the process of developing and optimizing centrifugal pumps, and effectively improve the production capacity of the projects. At the same time, to some extent, energy and environment problems have been solved, the application technology has become an important research and development direction in the new century. The main work and results of this paper are as follows: 1. Based on a large number of references, the development of computational fluid dynamics (CFD), CFD numerical simulation of centrifugal pumps and the development of optimization methods of centrifugal pumps are reviewed in detail. The numerical simulation method and turbulence model for the flow field in CQB65-50-160F centrifugal pump are also selected. 2. Three dimensional modeling software Pro/e was used to model the flow field in CQB65-50-160F centrifugal pump. The Fluent pre-processing software Gambit was used to mesh the model. 3. According to the selected solution method, turbulence model and actual working conditions, the Fluent software is set up, and the unsteady numerical simulation of centrifugal pump is completed. On the basis of comparing the friction loss formula of disk and volume loss formula in various literatures, the loss formula suitable for the centrifugal pump in this paper is determined, and the values of lift, shaft power and efficiency under various working conditions are obtained by modifying the numerical simulation results. According to the comparison between the performance parameters and the experimental data, the flow field of the centrifugal pump under different working conditions is analyzed, and the accuracy of the numerical simulation results under the standard condition is higher than that of the experimental data. 4. Based on the above analysis and a large number of references, a new optimization method is proposed, which takes the water pressure chamber as the research object, and the optimization function with the highest total efficiency as the objective and the constraint conditions of the unknown parameters are constructed. The optimized geometric parameters of the pressurized water chamber are obtained by using genetic algorithm and Matlab software. The model of the chamber is modified and the unsteady numerical simulation of the centrifugal pump is carried out. The final results show that the total efficiency of the optimized centrifugal pump is increased by 3.858 in the standard condition, and the optimization goal and the energy saving requirement are achieved.
【學位授予單位】：浙江工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH311

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