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ME EN 515 Andrew Ning [email protected] Boundary Layer Fundamentals Lecture 10

Transcript

Page 1: Lecture 10 - flowlab.groups.et.byu.netflowlab.groups.et.byu.net/me515/slides/10-blayer-intro.pdf · ME EN 515 Andrew Ning aning@byu.edu Boundary Layer Fundamentals Lecture 10

ME EN 515 Andrew Ning [email protected]

Boundary Layer FundamentalsLecture 10

mailto:[email protected]

Page 2: Lecture 10 - flowlab.groups.et.byu.netflowlab.groups.et.byu.net/me515/slides/10-blayer-intro.pdf · ME EN 515 Andrew Ning aning@byu.edu Boundary Layer Fundamentals Lecture 10

Boundary Layer

stagnation point

laminarturbulenttransition

separation

wakevelocity deficit

Page 3: Lecture 10 - flowlab.groups.et.byu.netflowlab.groups.et.byu.net/me515/slides/10-blayer-intro.pdf · ME EN 515 Andrew Ning aning@byu.edu Boundary Layer Fundamentals Lecture 10

Boundary Layer Profile

laminar

turbulent

Page 4: Lecture 10 - flowlab.groups.et.byu.netflowlab.groups.et.byu.net/me515/slides/10-blayer-intro.pdf · ME EN 515 Andrew Ning aning@byu.edu Boundary Layer Fundamentals Lecture 10

Wall Shear Stress

Page 5: Lecture 10 - flowlab.groups.et.byu.netflowlab.groups.et.byu.net/me515/slides/10-blayer-intro.pdf · ME EN 515 Andrew Ning aning@byu.edu Boundary Layer Fundamentals Lecture 10

Transition

https://www.youtube.com/embed/XOLl2KeDiOg

https://www.youtube.com/embed/XOLl2KeDiOg

Page 6: Lecture 10 - flowlab.groups.et.byu.netflowlab.groups.et.byu.net/me515/slides/10-blayer-intro.pdf · ME EN 515 Andrew Ning aning@byu.edu Boundary Layer Fundamentals Lecture 10

Factors that affect transition

Page 7: Lecture 10 - flowlab.groups.et.byu.netflowlab.groups.et.byu.net/me515/slides/10-blayer-intro.pdf · ME EN 515 Andrew Ning aning@byu.edu Boundary Layer Fundamentals Lecture 10

Separation

Page 8: Lecture 10 - flowlab.groups.et.byu.netflowlab.groups.et.byu.net/me515/slides/10-blayer-intro.pdf · ME EN 515 Andrew Ning aning@byu.edu Boundary Layer Fundamentals Lecture 10

Cylinder

Cp

NASA

✓

Page 9: Lecture 10 - flowlab.groups.et.byu.netflowlab.groups.et.byu.net/me515/slides/10-blayer-intro.pdf · ME EN 515 Andrew Ning aning@byu.edu Boundary Layer Fundamentals Lecture 10

Drag of a Sphere

NASA

Page 10: Lecture 10 - flowlab.groups.et.byu.netflowlab.groups.et.byu.net/me515/slides/10-blayer-intro.pdf · ME EN 515 Andrew Ning aning@byu.edu Boundary Layer Fundamentals Lecture 10

Skin friction vs Pressure Drag

actual body

effective body

Page 11: Lecture 10 - flowlab.groups.et.byu.netflowlab.groups.et.byu.net/me515/slides/10-blayer-intro.pdf · ME EN 515 Andrew Ning aning@byu.edu Boundary Layer Fundamentals Lecture 10

Lift Curve

↵

cl

Page 12: Lecture 10 - flowlab.groups.et.byu.netflowlab.groups.et.byu.net/me515/slides/10-blayer-intro.pdf · ME EN 515 Andrew Ning aning@byu.edu Boundary Layer Fundamentals Lecture 10

Title Text

T. J. Mueller from “An Album of Fluid Motion”

Page 13: Lecture 10 - flowlab.groups.et.byu.netflowlab.groups.et.byu.net/me515/slides/10-blayer-intro.pdf · ME EN 515 Andrew Ning aning@byu.edu Boundary Layer Fundamentals Lecture 10

laminar

turbulent

F

turbulent

Fturbulent

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