Record Display for the EPA National Library Catalog


Main Title Experimental and Theoretical Study of the Wake of a Block-Shaped Vehicle in a Shear-Free Boundary Flow.
Author Eskridge, Robert E. ; Thompson, Roger S. ;
CORP Author Environmental Sciences Research Lab., Research Triangle Park, NC.
Year Published 1982
Report Number EPA-600/J-82-109;
Stock Number PB83-188920
Additional Subjects Wakes ; Exhaust emissions ; Air pollution ; Motor vehicles ; Dispersions ; Wind tunnels ; Test chambers ; Atmospheric boundary layers ; Highways ; Profiles ; Reprints ; Numerical solution
Library Call Number Additional Info Location Last
NTIS  PB83-188920 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 18p
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. 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.