Discover OCR-ed Pages Content

Displaying results 451 - 475 of 58712

Analysis of the effects of wall perforations on the performance of a vehicle in a tube

Sequence 5
4. 5. 6. 3.2. Dra.g Disc in a Perforated-Wall Tube 3.2.1. Experimental Facility 3.2.2. Test Procedure 3.2.3. Data…
Sequence 6
Figure Number 11 LIST OF FIGURES Title Page Wall-Fixed and Disc Fixed Frames of Reference 51 Typical Pressure and…
Sequence 7
Figure Number 16b 17 18 19 20 21 22 23 24 25 26 27 28 29 Title Drag Disc Alone - Stationary Wall Pressure as…
Sequence 8
ABSTRACT The flow induced by a vehicle traveling through a porous- wall tube is analyzed as a one-dimensional incompressible…
Sequence 9
D dm w f n p p Q q r u u u s u w v w NOMENCLATURE hole area per unit length of tube contraction coefficient…
Sequence 10
1 1. INTRODUCTION This report deals with the effects of wall perforations on the propulsion of a vehicle traveling through a…
Sequence 11
2 condition derived in terms of a potential flow. This boundary condition is based on the linerized Bernoulli equation giving…
Sequence 12
3 propelled or wheel driven vehicle generates a flow in the direction of the motion of the vehicle because of the region of…
Sequence 13
4 For steady level motion, the drag disc solution must be matched to the actuator disc solution with the correct amount of…
Sequence 14
2. THEORETICAL ANALYSIS 2.1 Equations of Motion The one-dimensional steady-flow momentum and continuity equations for the…
Sequence 15
6 boundary conditions are established the resulting integrated equations define the entire inviscid flow field. In the case…
Sequence 16
In the wake of the vehicle, however, the magnitude of the inviscid flow velocity depends on the mode of propulsion and must be…
Sequence 17
8 x o --r.. 2.6 Equations 2.4 and 2.5 discribe the inviscid flow pressure and velocity distribution ahead of the drag disc…
Sequence 18
flow to change is a pressure difference across the wall. At station 3, P = P since the pressure must return to atmospheric due…
Sequence 19
It should be noted that if Pa~ P 2 " outflow occurs and eq. 2.1 becomes dP = -2U dU 10 2.10 Outflow results in a…
Sequence 20
11 Ud ~ .5. The momentum equation written between 2 and 2' is, for Ud ~ .5 and P2 , = Pa since the velocity at 2 is u…
Sequence 21
Equations 2.4, 2.11, 2.12 and 2.15 combined can be solved for U d in terms of ;8 to get i f = ~ [-f3 + ~2-3f3 + l·S ] d (.…
Sequence 22
13 a given disc porosity )9, until the pressure difference (P1-P2 ,) across the disc is determined. For viscous flow, this…
Sequence 23
that, upon numerical integration, the boundary condition of P - P = 0 a and U = 1 can be satisfied. 2.2.2.2. X» 0 -- INFLOW…
Sequence 24
Numerical solutions to eqs. 2.1 and 2.2 for inflow behind the drag disc can be obtained by assuming a value of P 2 , - P a…
Sequence 25
16 2.21 where the constant of integration has been evaluated at some distance ahead of the disc where P = P and the velocity…
Sequence 26
17 2.3.1.2. X~ 0 -- OUTFLOW. The inviscid one-dimen- sional momentum equation for outflow dP = -2UdU 2.25 shows dP/dU to…
Sequence 27
18 2.3.2. Viscous Flow 2.3.2.1. X ~ 0 -- INFLOW. For U 2!: 1, the friction term is negative, i.e. the flow is moving faster…
Sequence 28
+ C-r r 2.. c x L 4 2. 2.28 In eqs. 2.27 and 2.28, the first terms represent the change in momentum 19 for inviscid flow.…
Sequence 29
2.3.2.3. Thrust. The thrust coefficient for the actuator disc with viscous flow is given by = 2.4. The Vehicle as Matched…
Back to top