【摘要】：對(duì)于部分流泵的研究,以前主要集中在高速部分流泵的性能試驗(yàn)研究方面,因在低比轉(zhuǎn)速下的性能優(yōu)勢(shì),現(xiàn)已逐漸應(yīng)用于民用工業(yè)、消防領(lǐng)域。關(guān)于部分流泵的研究也逐漸從高轉(zhuǎn)速轉(zhuǎn)移到常規(guī)轉(zhuǎn)速。該類型泵的水力設(shè)計(jì),長(zhǎng)期以來(lái)都采用常規(guī)設(shè)計(jì)方法,即根據(jù)給定的設(shè)計(jì)參數(shù),依據(jù)經(jīng)驗(yàn)公式,確定泵的幾何參數(shù)。 隨著計(jì)算機(jī)技術(shù)的發(fā)展,有學(xué)者利用CFD技術(shù)對(duì)部分流泵進(jìn)行了內(nèi)部流場(chǎng)模擬,并對(duì)幾何參數(shù)的優(yōu)化設(shè)計(jì)方法進(jìn)行了探討。然而上述探討都屬于常規(guī)設(shè)計(jì)范疇,在部分流泵的研究中,還可以進(jìn)一步利用現(xiàn)代優(yōu)化方法進(jìn)行設(shè)計(jì)。 本文將以常轉(zhuǎn)速單級(jí)部分流泵為例,基于遺傳算法,借助Matlab軟件,對(duì)此部分流泵進(jìn)行間接優(yōu)化設(shè)計(jì),并對(duì)常規(guī)設(shè)計(jì)和優(yōu)化設(shè)計(jì)兩種方案進(jìn)行數(shù)值計(jì)算,目的在于對(duì)比、檢驗(yàn)優(yōu)化設(shè)計(jì)方法的可行性和合理性。具體工作如下: 1.通過(guò)建立部分流泵揚(yáng)程與其關(guān)鍵參數(shù)的表達(dá)式,基于泵揚(yáng)程和效率之間關(guān)系的間接優(yōu)化思想,以篩選出的部分流泵的主要幾何參數(shù)和動(dòng)力參數(shù)為變量,結(jié)合遺傳優(yōu)化算法,建立了部分流泵的優(yōu)化設(shè)計(jì)模型,借助Matlab軟件對(duì)部分流泵進(jìn)行了優(yōu)化。 2.采用雷諾時(shí)均N-S方程、RNG k-ε湍流模型和泵進(jìn)、出口定常條件,對(duì)常規(guī)方法設(shè)計(jì)的和本文的優(yōu)化方法設(shè)計(jì)的部分流泵進(jìn)行CFD計(jì)算和性能預(yù)測(cè)。流場(chǎng)模擬和性能預(yù)測(cè)結(jié)果表明:采用優(yōu)化方法設(shè)計(jì)的部分流泵,其效率平均提高了6.1%,效率明顯提高,性能顯著改善;泵內(nèi)部的速度場(chǎng)和壓力場(chǎng)分布更加均勻,泵的增壓效果比較突出。 3.從部分流泵內(nèi)流理論的本質(zhì)入手,依據(jù)泵的基本方程,推導(dǎo)了部分流泵的性能參數(shù)與其主要的幾何參數(shù)之間的函數(shù)關(guān)系式,探討了部分流泵在穩(wěn)態(tài)情況下的流動(dòng)特征,為其進(jìn)一步的優(yōu)化提供理論依據(jù)。
[Abstract]:The research of partial flow pump is mainly focused on the performance test of high speed partial flow pump. Because of its performance advantage at low specific speed, it has been gradually applied in civil industry and fire protection field. The research on partial flow pump has been gradually transferred from high speed to conventional speed. For a long time, the hydraulic design of this type of pump has adopted the conventional design method, that is, according to the given design parameters and empirical formula, the geometric parameters of the pump are determined. With the development of computer technology, some scholars use CFD technology to simulate the internal flow field of partial flow pump, and discuss the optimization design method of geometric parameters. However, all of the above researches belong to the conventional design category. In the research of partial flow pump, the modern optimization method can be used to design the pump. In this paper, the single stage partial flow pump with constant rotational speed is taken as an example. Based on genetic algorithm and with the aid of Matlab software, the indirect optimization design of the partial flow pump is carried out, and the two schemes of conventional design and optimal design are numerically calculated, the purpose of which is to compare the two schemes. Verify the feasibility and rationality of the optimal design method. The specific work is as follows: 1. Based on the indirect optimization idea of the relationship between pump head and efficiency, the main geometric and dynamic parameters of the selected partial flow pump are taken as variables, and the genetic optimization algorithm is combined. The optimization design model of partial flow pump is established, and the partial flow pump is optimized by Matlab software. 2. Using Reynolds time averaged N-S equation, RNG k- 蔚 turbulence model and steady condition of pump inlet and outlet, the CFD calculation and performance prediction of the partial flow pump designed by the conventional method and the optimization method in this paper are carried out. The results of flow field simulation and performance prediction show that the efficiency of the partial flow pump designed by the optimization method is improved by an average of 6.1%, the efficiency is obviously improved, and the performance of the pump is improved significantly. The distribution of velocity field and pressure field in pump is more uniform, and the booster effect of pump is more outstanding. 3. Starting from the essence of the internal flow theory of partial flow pump and according to the basic equations of pump, the functional relationship between the performance parameters of partial flow pump and its main geometric parameters is derived, and the flow characteristics of partial flow pump in steady state are discussed. It provides theoretical basis for further optimization.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH311

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 錢晨;低比轉(zhuǎn)速離心泵圓盤損失計(jì)算的探討及內(nèi)部流動(dòng)特征的數(shù)值分析[D];蘭州理工大學(xué);2012年

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本文編號(hào)：2375387