發(fā)布時間：2019-02-24 11:31

【摘要】：串并聯(lián)離心泵是一種通過中間換向閥實現(xiàn)小流量高揚程和大流量低揚程兩種工況的新型離心泵,可用作船舶的重要保安設備,及時有效地輸送液體以保證船舶的安全。本文以一臺串并聯(lián)離心泵為模型,采用數(shù)值模擬的方法,研究了該泵在額定工況下的內(nèi)部流動特性,并對不同葉片數(shù)和不同葉片出口安放角葉輪方案下的串并聯(lián)離心泵內(nèi)部流動特性進行了研究。 本文首先對CFD和壓力脈動的相關理論進行了初步介紹,并對串并聯(lián)泵的關鍵部件進行了設計,對串并聯(lián)泵進行建模和網(wǎng)格劃分,通過對不同網(wǎng)格數(shù)和不同湍流模型的模型進行計算,確定了適合此模型的網(wǎng)格數(shù)目和湍流模型,并將試驗外特性曲線與數(shù)值計算結(jié)果對比,驗證了數(shù)值計算結(jié)果的可靠性,并分析了串并聯(lián)泵的內(nèi)部流場特性。通過對非定常數(shù)值計算結(jié)果的分析,研究了串并聯(lián)泵內(nèi)部流場的壓力脈動特性,并研究了不同葉片數(shù)和不同葉片出口安放角對相應位置壓力脈動規(guī)律的影響,發(fā)現(xiàn)葉片數(shù)和葉片出口安放角均會影響泵內(nèi)的以葉頻及其倍頻為特征頻率處的壓力脈動幅值,但是對壓力脈動幅值影響規(guī)律不同,為串并聯(lián)離心泵以降低壓力脈動為目標的優(yōu)化設計及泵的減振降噪研究提供了一定的參考依據(jù)。
[Abstract]:Series-parallel centrifugal pump is a new type of centrifugal pump, which can realize two working conditions of small flow, high head and large flow and low lift by means of intermediate directional valve. It can be used as an important security equipment for ships and can transport liquid in time and effectively to ensure the safety of ships. In this paper, a series-parallel centrifugal pump is used as a model, and the internal flow characteristics of the pump under rated working conditions are studied by means of numerical simulation. The internal flow characteristics of series and parallel centrifugal pumps with different blade numbers and different blade outlet placement angle impellers are studied. In this paper, the related theories of CFD and pressure pulsation are introduced, and the key components of series-parallel pump are designed, and the modeling and meshing of series-parallel pump are carried out. Through the calculation of different meshes and different turbulence models, the number of meshes and turbulence models suitable for this model are determined, and the experimental external characteristic curves are compared with the numerical results to verify the reliability of the numerical results. The characteristics of the internal flow field of the series-parallel pump are analyzed. Based on the analysis of the unsteady numerical results, the pressure pulsation characteristics of the flow field in the series and parallel pumps are studied, and the influence of different blade numbers and blade outlet placement angles on the pressure pulsation law of the corresponding position is studied. It is found that both the blade number and the blade outlet angle will affect the amplitude of pressure pulsation at the characteristic frequency of blade frequency and frequency doubling, but the effect on the amplitude of pressure pulsation is different. It provides a certain reference for the optimization design of series-parallel centrifugal pump aimed at reducing pressure pulsation and the research of vibration and noise reduction of the pump.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TH311

【參考文獻】

相關期刊論文 前10條

1 徐朝暉,吳玉林,陳乃祥,劉宇,張梁,吳玉珍;基于滑移網(wǎng)格與RNG湍流模型計算泵內(nèi)的動靜干擾[J];工程熱物理學報;2005年01期

2 馬士虎,余棟高,謝江輝,蔣青,王曉東,汪國祥;新型串并聯(lián)雙級離心泵研制[J];船舶工程;2002年06期

3 于萍 ,孫衛(wèi)平 ,楊志軍;船用潛水式串并聯(lián)離心泵的設計與研究[J];機電設備;2002年04期

4 孫衛(wèi)平,周華青,王震敏,杜云水;潛水型消防排水泵的自動控制系統(tǒng)[J];機電設備;2003年01期

5 徐朝暉,吳玉林,陳乃祥,劉宇,張梁;高速泵內(nèi)三維非定常動靜干擾流動計算[J];機械工程學報;2004年03期

6 姚志峰;王福軍;楊敏;瞿麗霞;肖若富;徐旭東;何成連;;葉輪形式對雙吸離心泵壓力脈動特性影響試驗研究[J];機械工程學報;2011年12期

7 王秀勇;王燦星;;基于數(shù)值模擬的離心泵性能預測[J];流體機械;2007年10期

8 周嶺;施衛(wèi)東;陸偉剛;李輝;裴冰;;深井離心泵內(nèi)部非定常流動的壓力脈動特性分析[J];農(nóng)業(yè)工程學報;2011年10期

9 裴吉;王文杰;袁壽其;孟凡;陳佳;;低比轉(zhuǎn)數(shù)離心泵內(nèi)部非定常流動特性數(shù)值預測[J];農(nóng)業(yè)機械學報;2014年01期

10 裴吉;袁壽其;袁建平;王文杰;;單葉片離心泵壓力脈動強度多工況對比研究[J];華中科技大學學報(自然科學版);2013年12期

，

本文編號：2429509