Lecture 7 Boundary Layer
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1 SPC 307 Introduction to Aerodynamics Lecture 7 Boundary Layer April 9, 2017 Sep. 18,
2 Character of the steady, viscous flow past a flat plate parallel to the upstream velocity Inertia force = ma = L 3 *V dv/dl= V 2 L 2 Viscous Force = L 2 dv/dl = V L VL Inertia Force Re Viscous Force (a)low Reynolds number flow, (b)moderate Reynolds number flow, (c) large Reynolds number flow. 2
3 3
4 Boundary Layer The purpose of the boundary layer is to allow the fluid to change its velocity from the upstream value of U to zero on the surface. Thus, V = 0 at y = 0 and V U iˆ at the edge of the boundary layer, with the velocity profile, u = u(x, y) bridging the boundary layer thickness. This boundary layer characteristic occurs in a variety of flow situations, not just on flat plates. For example, boundary layers form on the surfaces of cars, in the water running down the gutter of the street, and in the atmosphere as the wind blows across the surface of the Earth (land or water). 4
5 Boundary Layer 5
6 Boundary Layer The distance through which the external inviscid flow is displaced by the presence of the boundary layer. 6
7 Boundary Layer 7
8 Boundary Layer 8
9 Boundary Layer 9
10 Boundary Layer Therefore, θ is an index that is proportional to the decrement in momentum flow due to the presence of the boundary layer. It is the height of a hypothetical streamtube which is carrying the missing momentum flow at freestream conditions. 10
11 Reynolds Number Re = ρvl μ = Inertia Effect VIscosity Effect Where density, μ viscosity and V velocity. Area L is the characteristic length: for a flat plate: Plate Length For a circle or a sphere is Diameter 11
12 Reynolds Number for a flow over a Flate Plate Re = ρvx μ Where density, μ viscosity and V velocity. Area x is the distance from the leading edge: for a flat plate: Plate Length 12
13 Re VL Inertia Force Viscous Force 13
14 Example
15 Example Solution 15
16 Example Solution 16
17 Boundary Layer over a flat plate 17
18 Boundary Layer transition from laminar to turbulent The transition from a laminar boundary layer to a turbulent boundary layer occurs at a critical value of the Reynolds number, Re xcr on the order of to depending on the roughness of the surface and the amount of turbulence in the upstream flow 18
19 Boundary Layer on a Flat Plate Not to scale at y= : v = 0.99 V To scale at y= : v = 0.99 V 19
20 Boundary Layer on a Flat Plate 20
21 Boundary Layer transition from laminar to turbulent 21
22 Transition 22
23 Transition 23
24 24
25 Laminar Boundary Layer 25
26 Prandtl/Blasius Boundary Layer Solution for steady, two-dimensional laminar flows with negligible gravitational effects, incompressible flow: Continuity Equation By solving Navier Stokes equations 26
27 Prandtl/Blasius Boundary Layer Solution Since the boundary layer is thin, it is expected that the component of velocity normal to the plate is much smaller than that parallel to the plate and that the rate of change of any parameter across the boundary layer should be much greater than that along the flow direction. That is, With these assumptions it can be shown that the governing equations reduce to the following boundary layer equations: 27
28 Prandtl/Blasius Boundary Layer Solution With these assumptions it can be shown that the governing equations reduce to the following boundary layer equations: 28
29 Prandtl/Blasius Boundary Layer Solution Boundary conditions No Exact Solution is available for those equations 29
30 Prandtl/Blasius Boundary Layer Solution For Compressible B. L. 30
31 Prandtl/Blasius Boundary Layer Solution It can be argued that in dimensionless form the boundary layer velocity profiles on a flat plate should be similar regardless of the location along the plate. That is, 31
32 Prandtl/Blasius Boundary Layer Solution The final solution is 32
33 Prandtl/Blasius Boundary Layer Solution 33
34 Prandtl/Blasius Boundary Layer Solution 34
35 Prandtl/Blasius Boundary Layer Solution 35
36 Momentum Integral Boundary Layer Equation for a Flat Plate 36
37 Momentum Integral Boundary Layer Equation for a Flat Plate 37
38 Momentum Integral Boundary Layer Equation for a Flat Plate 38
39 Turbulent Boundary Layer 39
40 Turbulent Boundary Layer Experimental measurements have shown that the time-averaged velocity for a turbulent boundary layer on a flat plate may be represented by the 1/7th power law: 40
41 Turbulent Boundary Layer 41
42 Turbulent Boundary Layer 42
43 Flat Plate Drag v = 0.99 V Drag on flat plate is solely due to friction (F D = F Dfriction ) created by laminar, transitional, and turbulent boundary layers. BL thickness,, is the distance from the plate at which v = 0.99 V 43
44 Flat Plate Drag C D, friction = C f Local friction coefficient Laminar: Turbulent: Average friction coefficient For some cases, plate is long enough for turbulent flow, but not long enough to neglect laminar portion 44
45 Flat Plate Drag Transition takes place at a distance x given by: Re xcr =2X10 5 to 3X10 6 We will use Re xcr = 5X10 5 Drag coefficient may also be obtained from charts such as those on the next slides 45
46 Friction drag coefficient for a flat plate parallel to the upstream flow. Laminar: C Df = f (Re) Turbulent: C Df = f (Re, /L) 46
47 47
48 AIRFOIL GEOMETRY PARAMETERS 48
49 AIRFOIL GEOMETRY PARAMETERS If a horizontal wing is cut by a vertical plane, the resultant section is called the airfoil section. The generated lift and stall characteristics of the wing depend strongly on the geometry of the airfoil sections that make up the wing. Geometric parameters that have an important effect on the aerodynamic characteristics of an airfoil section include (1) the leading-edge radius, (2) the mean camber line, (3) the maximum thickness and the thickness distribution of the profile, and (4) the trailing-edge angle. The effect of these geometric parameters, will be discussed after an introduction to airfoil-section nomenclature. 49
50 Parameters used to describe the airfoil Some of the basic parameters to describe the airfoil geometry are: 1. Leading edge the forward most point on the airfoil (typically placed at the origin for convenience) 2. Trailing edge the aft most point on the airfoil (typically placed on the x axis for convenience) 3. Chord line a straight line between the leading and trailing edges (the x axis for our convention) 4. Mean camber line a line midway between the upper and lower surfaces at each chord-wise position 5. Maximum camber the largest value of the distance between the mean camber line and the chord line, which quantifies the camber of an airfoil 6. Maximum thickness the largest value of the distance between the upper and lower surfaces, which quantifies the thickness of the airfoil 7. Leading-edge radius the radius of a circle that fits the leading-edge curvature These geometric parameters are used to determine certain aerodynamic characteristics of an airfoil. 50
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