本文選題：離心泵 + 流固耦合�。� 參考：《大連交通大學(xué)》2012年碩士論文

【摘要】：離心泵是一種通用的流體機械，在實際的工業(yè)生產(chǎn)中占有非常重要的地位，特別是在冶金、石油化工、城市供水、然氣輸送以及農(nóng)業(yè)灌溉中有著非常廣泛的應(yīng)用。在實際運行過程中，離心泵內(nèi)流場與葉輪之間存在著相互耦合，考慮流固耦合作用的數(shù)值模擬能更真實的反映離心泵的流場特征。本文對某一離心泵進行了定常、瞬態(tài)及流固耦合分析，獲得了離心泵葉片、葉輪及蝸殼等部位的壓力及速度分布情況，為離心泵的進一步優(yōu)化設(shè)計提供了數(shù)據(jù)參考。 本文主要研究工作包括： 1.在充分了解流固耦合定義和研究現(xiàn)狀、流固耦合交接面處數(shù)據(jù)傳遞方法等基礎(chǔ)上，利用ANSYS-Workbench軟件對離心泵內(nèi)流場進行詳盡的數(shù)值模擬。 2.采用κ ε湍流模型對離心泵進行定常數(shù)值模擬，模擬分別在設(shè)計工況與非設(shè)計工況下進行，，得到內(nèi)流場靜壓、總壓及速度分布圖；根據(jù)模擬結(jié)果所預(yù)測的離心泵性能曲線與試驗測得的性能曲線吻合良好。 3.以定常分析結(jié)果為初始條件，通過滑移網(wǎng)格模型對離心泵進行瞬態(tài)數(shù)值模擬，得到一個葉片通過周期內(nèi)壓力場、速度場的變化趨勢：葉片剛轉(zhuǎn)到隔舌處時，壓力值、速度值最小，然后逐漸增大，直到葉片已經(jīng)劃過流道中面時，壓力值、速度值達到最大值，然后迅速減小。 4.利用ANSYS Workbench中Transient Structural瞬態(tài)分析模塊與CFX建立結(jié)構(gòu)場與流體場雙向求解過程，得到設(shè)計工況下流固耦合前后速度場、壓力場隨時間的變化情況；通過頻譜分析得出：設(shè)計工況和大流量工況下各點壓力脈動頻率以葉片的通過頻率為主，約為343Hz。在小流量工況下，低于1倍葉片通過頻率（98Hz）的低頻脈動占據(jù)主導(dǎo)地位。
[Abstract]:Centrifugal pump is a kind of universal fluid machinery, which plays an important role in practical industrial production, especially in metallurgy, petrochemical industry, urban water supply, natural gas transportation and agricultural irrigation. In the actual operation process, there is a mutual coupling between the flow field and impeller in the centrifugal pump, and the numerical simulation considering the fluid-solid coupling can more truly reflect the flow field characteristics of the centrifugal pump. In this paper, the steady, transient and fluid-solid coupling analysis of a centrifugal pump is carried out, and the pressure and velocity distributions of the blade, impeller and volute of the centrifugal pump are obtained. It provides the data reference for the further optimization design of centrifugal pump. The main research work of this paper includes: 1. On the basis of fully understanding the definition and research status of fluid-solid coupling and the method of data transfer at fluid-solid coupling interface, the numerical simulation of flow field in centrifugal pump is carried out by using ANSYS-Workbench software in detail. 2. The steady numerical simulation of centrifugal pump is carried out by using 魏 蔚 turbulence model. The static pressure, total pressure and velocity distribution of the internal flow field are obtained under the design and off-design conditions, respectively. The performance curve of centrifugal pump predicted by the simulation results is in good agreement with the experimental results. 3. Taking the results of steady analysis as initial conditions, the transient numerical simulation of centrifugal pump is carried out by sliding grid model, and the variation trend of velocity field of a blade through the pressure field in the period is obtained: when the blade is just transferred to the tongue, the pressure value is obtained. The velocity value is minimum, then increases gradually, until the blade has crossed the middle surface of the runner, the pressure value and velocity value reach the maximum value, and then decrease rapidly. 4. Using transient structural transient analysis module in ANSYS Workbench and CFX to establish bidirectional solution process of structure field and fluid field, the velocity field and pressure field change with time before and after fluid-solid coupling under design condition are obtained. The frequency of pressure pulsation at each point is mainly the passing frequency of the blade, which is about 343Hz under the design condition and the large flow condition by spectrum analysis. Under the condition of small flow rate, the low frequency pulsation of less than 1 times blade passing through frequency of 98 Hz is dominant.
【學(xué)位授予單位】：大連交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH311

【引證文獻】

相關(guān)碩士學(xué)位論文 前1條

1 千勃興;離心泵葉輪葉片的有限元分析及優(yōu)化[D];西北農(nóng)林科技大學(xué);2013年

本文編號：1995816