| Main Title |
Wake of a block vehicle in a shear-free boundary flow : an experimental and theoretical study / |
| Author |
Eskridge, Robert E. ;
Thompson, Roger S.
|
| Other Authors |
|
| CORP Author |
Environmental Sciences Research Lab., Research Triangle Park, NC. |
| Publisher |
U.S. Environmental Protection Agency, Environmental Sciences Research Laboratory, |
| Year Published |
1982 |
| Report Number |
EPA-600/3-82-007 |
| Stock Number |
PB82-196528 |
| OCLC Number |
700505214 |
| Subjects |
Automobiles--Motors--Exhaust gas--Mathematical models ;
Wakes (Aerodynamics)
|
| Additional Subjects |
Automobiles ;
Exhaust emissions ;
Wakes ;
Flow distribution ;
Aerodynamic characteristics ;
Laminar flow ;
Turbulent flow ;
Boundary layer flow ;
Flow fields
|
| Internet Access |
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| EKBD |
EPA-600/3-82-007 |
|
Research Triangle Park Library/RTP, NC |
02/07/2011 |
| NTIS |
PB82-196528 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
xv, 99 p. : ill., charts ; 28 cm. |
| Abstract |
The wake of a moving vehicle was simulated using a specially-constructed wind tunnel with a moving floor. A 'block-shaped' model vehicle was fixed in position over the test-section floor while the floor moved at the freestream air speed to produce a uniform, shear-free, approach flow. This simulates an automobile traveling along a straight highway under calm atmospheric conditions. Vertical and lateral profiles of mean and fluctuating velocities and Reynolds stresses in the wake of the vehicle were obtained using a hot-film anemometer with an X-probe. Profiles were taken at distances of 10 to 80 model heights downwind. A momentum type wake was observed behind the block-shaped vehicle. The wake does not have a simple self-preserving form. However, it is possible to collapse the velocity deficit with one length and one velocity scale. Two new theories for the velocity deficit are compared to the theory of Eskridge and Hunt (1979). A theory which considered a height-dependent eddy viscosity was found to fit the data best. Length and velocity scales were found for the longitudinal variation of the turbulent kinetic energy. The lateral variation is described by a two-dimensional numerical fit of the crosswind variation of the data. |
| Notes |
"January 1982." Includes bibliographical references (p. 24-25) "EPA-600/3-82-007." |
| Place Published |
Research Triangle Park, N.C. |
| Access Notes |
Also available online. Location last verified 11/09/10. |
| Corporate Au Added Ent |
Environmental Sciences Research Laboratory. Meteorology & Assessment Division. |
| NTIS Title Notes |
Fluid modeling rept. no. 13 for 1 Jan 79-1 Oct 81. |
| PUB Date Free Form |
Mar 82 |
| Category Codes |
13F; 1A; 85H; 51A |
| NTIS Prices |
PC A06/MF A01 |
| Primary Description |
600/09 |
| BIB Level |
m |
| Cataloging Source |
OCLC/T |
| Control Number |
323813922 |
| OCLC Time Stamp |
20110204124650 |
| Language |
eng |
| Origin |
OCLC |
| Type |
MERGE |
| OCLC Rec Leader |
01339nam 2200301Ka 45020 |
