文档介绍：Science and Technology University of Beijing
Engineering Fluid Mechanics
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Preface
1 Concept of Fluid Mechanics
2 Development and Application of Fluid
Mechanics
3 Research Method of Fluid Mechanics
3 Contents
5 Reference
1 Concept of Engineering Fluid Mechanics
What is Fluid? liquids
gases Fluid
solid
What is Fluid Mechanics?
Fluid Mechanics is a branch of Applied (macro-) Mechanics:
1. To study the principles of the statics and motion of
liquids and gases.
2. To study the action of solid on fluid.
3. To study the applications of these principles.
Engineering Fluid Mechanics
Development and Application of Fluid Mechanics
ďďď1ĐĐĐThe First Satge (before 17th century)
•(256 BC) Dujiang weir conservancy project
•(250 BC) Archimedes Principle 䰓㉇ᖋᅮᕟ
• Clepsydra ⓣ໊䅵ᯊ
• Sail 亢Ꮪǃwindmill 亢䔺
• Water Wheel ∈䕂ᴎ
Development and Application of Fluid Mechanics
ďďď2ĐĐĐThe Second Satge (17-19th century)
• In 1647, Pascal statics Principle
• In 1678, Newtonian Stress equation
• In 1738, Bernoulli Equation
• In 1775, Euler built basic equation of ideal fluid
• In 1781, Lagrange advanced stream function
• In 1826, N-S equation.
• In 1876, Reynolds found : laminar flow and turbulent flow.
• In 1858, Helmolholz theory of motion vortex.
• in 1887, Separation theory of flow around body
• In the end of 19th century, the theory of similarity
Development and Application of Fluid Mechanics
ďďď2ĐĐĐThe Third Satge (20th century)
• In 1902, Kutta Princple
• In 1904, Prandtl boundary layer theory
• In 1910-1945, aerodynamics theories and
experiments
• In 1912, Karman Vortex street
• In 1921, Momentum Integral Equation
• In 1954, Theory of turbulent flow
Development and Application of Fluid Mechanics
ďďď2ĐĐĐThe Fourth Satge (Middle 20th century-)
Two key points:
• Turbulence ঠ, Vortex ฿༨ၮՎand unsteady
flow ׄՇШঠ
• Applica