運行穩(wěn)定性和安全性對于發(fā)電廠、水下航行器等與流體相關(guān)的工業(yè)裝置極為關(guān)鍵。在這些系統(tǒng)或裝置中,當(dāng)管道、閥門和過流部件工作時,經(jīng)常會遭遇空化現(xiàn)象�？栈轁绾筢尫啪薮蟮哪芰�,會逐漸破壞相關(guān)的部件,即發(fā)生空蝕;空蝕引起質(zhì)量損失和裝置運行效率的下降,嚴(yán)重時導(dǎo)致部件斷裂和流程運行中斷。為確保流體輸送和流體裝置的安全運行,必須提高相關(guān)部件的抗空蝕能力。為達(dá)到這一目的,一方面對相關(guān)部件的結(jié)構(gòu)進(jìn)行優(yōu)化設(shè)計,另一方面對材料進(jìn)行空蝕性能研究。本研究就是針對過流部件常用的金屬材料進(jìn)行超聲空蝕機(jī)理研究,綜合評估這些材料的抗空蝕性能。本文的主要工作及結(jié)論如下:（1）根據(jù)ASTM G32國際標(biāo)準(zhǔn),搭建了超聲空蝕實驗臺,對不同材料進(jìn)行。超聲空蝕實驗。選擇了三種液體,即去離子水、Na₂SO₄和NaHCO₃溶液,用于研究液體介質(zhì)對超聲空蝕的影響。選擇的介質(zhì)溫度范圍為15–60 ^oC。實驗中考慮超聲換能器頭部和試樣表面之間的距離（靶距）對空蝕的影響。設(shè)計了測量方案,對空蝕試樣的累積質(zhì)量損失、微觀硬度和殘余應(yīng)力進(jìn)行測量,用掃描電子顯微鏡... 

【文章來源】：江蘇大學(xué)江蘇省

【文章頁數(shù)】：150 頁

【學(xué)位級別】：博士

【文章目錄】：
DEDICATION
Abstract
摘要
List of Symbols
Chapter1 Introduction
    1.1 Background
    1.2 Causes of cavitation
    1.3 Erosion development with exposure time
    1.4 Operation parameters influencing cavitation erosion
    1.5 Summary of research gaps
    1.6 The purpose of the study
Chapter2 Experimental setup and methods for cavitation
    2.1 Introduction
    2.2 Experimental techniques for cavitation erosion
    2.3 Experimental methods for cavitation erosion test
    2.4 Ultrasonic cavitation erosion experimental rig
    2.5 Summary
Chapter3 Comparative investigation of ultrasonic erosion for three materials in deionized water
    3.1 Introduction
    3.2 Experimental approach
    3.3 Experimental materials and properties
    3.4 Comparison of ultrasonic cavitation of selected materials
    3.5 Summary
Chapter4 Effects of liquid medium on ultrasonic cavitation erosion of copper alloy
    4.1 Introduction
    4.2 Experimental approach
    4.3 Effects of liquid medium on the cavitation erosion
    4.4 Summary
Chapter5 Effects of the concentration of NaHCO3 solution on cavitation erosion of copper alloy
    5.1 Introduction
    5.2 Experimental approach
    5.3 Results and discussion
    5.4 Summary
Chapter6 Effects of liquid medium temperature on the cavitation erosion of CuZnAl shape memory alloy
    6.1 Introduction
    6.2 Experimental approach
    6.3 Properties of CuZnAl shape memory alloy
    6.4 Results and discussion
    6.5 Discussion on mechanisms of cavitation erosion
    6.6 Summary
Chapter7 Effects of standoff distance on cavitation erosion of CuZnAl shape memory alloy
    7.1 Introduction
    7.2 Experimental approach
    7.3 Results and discussion
    7.4 Summary
Chapter8 Conclusions and prospect
    8.1 Major work and conclusions
    8.2 Recommendations for future work
References
Acknowledgements
Publications



本文編號：3390959