工程流體力學(xué)是工科相關(guān)專業(yè)的重要基礎(chǔ)課程。本書(shū)為適用于單學(xué)期30 ~ 40課時(shí)雙語(yǔ)教學(xué)及境內(nèi)、境外本科生共同學(xué)習(xí)使用的簡(jiǎn)明教材。
本書(shū)內(nèi)容共六章，著重講述流體力學(xué)的基礎(chǔ)原理和基礎(chǔ)假設(shè)，以及怎樣應(yīng)用這些基本原理來(lái)解決實(shí)際的工程問(wèn)題。第1章介紹流體力學(xué)的基本研究?jī)?nèi)容、壓強(qiáng)的表示方法及流體的基本性質(zhì)，包括流體的密度、黏度、表面張力等；第2章為流體靜力學(xué)相關(guān)內(nèi)容，包括流體上的力，流體靜壓強(qiáng)分布，測(cè)壓管的原理與應(yīng)用，平面壁和曲面壁上的流體靜壓力以及流體的相對(duì)靜止等；第3章介紹描述流體運(yùn)動(dòng)的方法和相關(guān)概念，如流線、系統(tǒng)和控制體，以及如何應(yīng)用雷諾輸運(yùn)定理將物理關(guān)系在系統(tǒng)和控制體間轉(zhuǎn)換；第4章介紹理想流體動(dòng)力學(xué)的基礎(chǔ)方程，包括連續(xù)性方程、伯努利方程及其應(yīng)用和動(dòng)量方程；第5章介紹量綱分析和相似原理的基本思想及其在設(shè)計(jì)和簡(jiǎn)化實(shí)驗(yàn)系統(tǒng)、分析實(shí)驗(yàn)數(shù)據(jù)方面的優(yōu)勢(shì)；第6章為黏性不可壓縮流體的內(nèi)部流動(dòng)，主要介紹實(shí)際流體的能量損失和層流及紊流狀態(tài)，其中還簡(jiǎn)單分析了黏性流體在圓管、孔口和縫隙中的流動(dòng)特點(diǎn)。
本書(shū)對(duì)一些問(wèn)題的分析和公式推導(dǎo)做了適當(dāng)簡(jiǎn)化，增加了很多關(guān)于流體傳動(dòng)、液壓泵、閥及液壓系統(tǒng)的案例分析和例題。特別在第6章關(guān)于實(shí)際流體的能量方程部分，重點(diǎn)增加了包括泵和渦輪系統(tǒng)的能量方程及系統(tǒng)功率、效率的計(jì)算，通過(guò)這些內(nèi)容向讀者展示作為機(jī)械工程師可能處理的與流體相關(guān)的問(wèn)題和應(yīng)用。通過(guò)本課程的學(xué)習(xí)，對(duì)簡(jiǎn)單的工程問(wèn)題，讀者應(yīng)該能夠獨(dú)立對(duì)待解決的問(wèn)題進(jìn)行分析，做出適當(dāng)?shù)募僭O(shè)或近似，然后運(yùn)用相關(guān)的定理建立控制方程并求解，后代入數(shù)據(jù)進(jìn)行計(jì)算。
本書(shū)的編者感謝華僑大學(xué)教材建設(shè)項(xiàng)目的支持和教學(xué)團(tuán)隊(duì)各位教師的通力協(xié)作。本書(shū)由劉曉梅任主編，李洪友、林添良任副主編。編寫(xiě)團(tuán)隊(duì)其他成員包括
閆潔、劉晶峰、顧永華、段闖闖。
本書(shū)可作為高等院校相關(guān)專業(yè)流體力學(xué)的教材，特別適用于機(jī)械工程類專業(yè)，也可供工程技術(shù)人員參考。
由于作者水平有限，書(shū)中難免有不妥之處，懇請(qǐng)讀者批評(píng)指正。

Preface
Engineering fluid mechanics is an important basic course for related majors. This is a brief bilingual course matching with one-semester 30~40 class hours for both domestic and overseas under-graduates.
In this book of six chapters, we stress the governing principles, the assumptions and the method to apply the principles to the solution of practical engineering problems. In chapter 1, some fundamental aspects of fluid mechanics, pressure scales and fluid properties are introduced, including density, viscosity and surface tension. Chapter 2 introduces fluid statics, including forces on fluid, distribution of pressure in fluid at absolute and relative rest, theories and applications of manometer, hydrostatic force on a plane surface and a curved surface etc. Chapter 3 explains methods and concepts for the description of fluid motion, including streamline, system and control volume, and Reynolds transport theorem for the transformation from system to control volume. Emphasis is placed on the fundamental equations of ideal fluid dynamics in chapter 4, including the equation of continuity, the Bernoulli equation and the equation of momentum. The advantages of using dimensional analysis and similarity for planning and simplifying experiments and for organizing test data are featured in Chapter 5. Chapter 6 expands on the internal flow of viscous incompressible fluid, includes energy losses of viscous fluid flow, the flow regimes of laminar and turbulent, practical concerns such as pipe flow, orifice and nozzle flow, and narrow gap flow are also discussed in this chapter.
The analysis of some problems and derivation of formulas are appropriately simplified in this book, and there are abundant examples and exercises of fluid transmission, hydraulic pump and valves. Special attention are given to the energy equation of real fluid, calculation of power and efficiency for the systems involving pump and turbine are presented so that the readers can understand and analyze many of the practical problems encountered by the engineer. Through this course, readers should be able to analyze problems independently, make assumptions, establish equilibrium equations, substitute parameters and solve simple engineering problems by using relevant principles.
The authors are very much indebted to the textbook funding project of Huaqiao University. This book is edited by Liu Xiaomei, Li Hongyou and Lin Tianliang. Thanks to Yan Jie,