本文選題：離心泵 + 數(shù)值模擬�。� 參考：《昆明理工大學(xué)》2017年碩士論文

【摘要】：離心泵作為一種使用比較廣泛的流體機(jī)械、廣泛用于工業(yè)生產(chǎn)和日常生活中。離心泵的效率的提高會(huì)減少社會(huì)對(duì)能源需求的壓力。隨著計(jì)算機(jī)技術(shù)的快速發(fā)展,利用FLUENT實(shí)現(xiàn)離心泵的內(nèi)部流場(chǎng)數(shù)值模擬為了解和掌握離心泵復(fù)雜的內(nèi)部流動(dòng)開辟了新的途徑,彌補(bǔ)了傳統(tǒng)設(shè)計(jì)方法的不足,對(duì)離心泵的優(yōu)化設(shè)計(jì)、水力性能的改善、提高其效率具有非常重要的意義。本文首先采用Pro/E軟件建立離心泵的三維實(shí)體模型,然后采用計(jì)算流體動(dòng)力學(xué)軟件FLUENT對(duì)IS型離心泵進(jìn)行內(nèi)部流場(chǎng)的數(shù)值模擬,得到不同工況下離心泵內(nèi)部流場(chǎng)不同時(shí)刻的速度分布和壓力分布,分析了離心泵內(nèi)部的流動(dòng)規(guī)律,并進(jìn)行性能預(yù)測(cè)。通過計(jì)算結(jié)果與實(shí)驗(yàn)結(jié)果的比較驗(yàn)證該方法計(jì)算離心泵內(nèi)部流動(dòng)的可行性和正確性。本文主要作了以下幾方面的研究工作:(1)介紹了離心泵內(nèi)部流場(chǎng)數(shù)值模擬的國內(nèi)外發(fā)展研究現(xiàn)狀及商用CFD軟件的發(fā)展,從控制方程、湍流模型問題的提出及解決方法、湍流模型的后處理等多方面介紹了湍流流動(dòng)數(shù)值模擬理論。(2)介紹了計(jì)算流體動(dòng)力學(xué)的基本理論知識(shí),闡述了流體與流動(dòng)的基本特性,給出了流體動(dòng)力學(xué)的基本控制方程。(3)利用Pro/E軟件對(duì)IS型離心泵過流部件進(jìn)行實(shí)體造型,建立離心泵的三維實(shí)體模型。(4)介紹了 FLUENT環(huán)境下離心泵的數(shù)值計(jì)算過程,應(yīng)用MRF法對(duì)離心泵內(nèi)部湍流流動(dòng)進(jìn)行定常數(shù)值模擬,獲得了不同工況下各個(gè)過流部件的速度和壓力分布,揭示了泵內(nèi)部流動(dòng)規(guī)律。(5)使用了 FLUENT中的多相流理論模擬了固液兩相流狀態(tài)時(shí)分別從顆粒直徑與固相濃度兩個(gè)因素對(duì)離心泵內(nèi)壓力、速度及固相濃度分布的影響進(jìn)行模擬分析并計(jì)算不同固相濃度對(duì)泵揚(yáng)程和效率的影響�？偨Y(jié)得出泵內(nèi)主要磨損主要部位在蝸殼近壁面端及蝸殼隔舌處,葉輪進(jìn)口葉片工作面?zhèn)鹊慕Y(jié)論。為以后對(duì)離心泵磨損機(jī)理研究及離心泵結(jié)構(gòu)選型和優(yōu)化提供了相應(yīng)的理論數(shù)據(jù)基礎(chǔ)。
[Abstract]:As a widely used fluid machine, centrifugal pump is widely used in industrial production and daily life. The efficiency of centrifugal pumps will reduce the pressure on energy demand. With the rapid development of computer technology, using fluent to realize the numerical simulation of internal flow field of centrifugal pump has opened up a new way to understand and master the complex internal flow of centrifugal pump, which makes up for the deficiency of traditional design method, and optimizes the design of centrifugal pump. The improvement of hydraulic performance and the improvement of its efficiency are of great significance. In this paper, the three-dimensional solid model of centrifugal pump is established by Prop / E software, and then the internal flow field of is centrifugal pump is simulated by computational fluid dynamics software fluent. The velocity distribution and pressure distribution of the flow field in the centrifugal pump at different working conditions are obtained. The flow law in the centrifugal pump is analyzed and the performance prediction is carried out. The feasibility and correctness of the method for calculating the flow inside the centrifugal pump are verified by comparing the calculated results with the experimental results. The main work of this paper is as follows: (1) the development of numerical simulation of flow field in centrifugal pump at home and abroad and the development of commercial CFD software are introduced. The theory of numerical simulation of turbulent flow is introduced from the post-processing of turbulence model. (2) the basic theoretical knowledge of computational fluid dynamics and the basic characteristics of fluid and flow are introduced. The basic governing equations of fluid dynamics are given. (3) the solid modeling of the flow passing parts of is type centrifugal pump is carried out by using Prop / E software, and the three-dimensional solid model of the centrifugal pump is established. (4) the numerical calculation process of centrifugal pump under fluent environment is introduced. The steady numerical simulation of turbulent flow in centrifugal pump is carried out by using MRF method, and the velocity and pressure distribution of each overflowing part under different working conditions is obtained. (5) the multiphase flow theory in fluent is used to simulate the pressure in the centrifugal pump from two factors of particle diameter and solid concentration, respectively, when the solid-liquid two-phase flow is in the state of solid-liquid two-phase flow. The effects of velocity and solid concentration distribution on pump lift and efficiency were simulated and analyzed. It is concluded that the main wear parts of the pump are near the wall of the volute and the tongue of the volute and the face side of the impeller inlet blade. It provides a theoretical basis for the research of centrifugal pump wear mechanism and the selection and optimization of centrifugal pump structure.
【學(xué)位授予單位】：昆明理工大學(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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