As the frequency of the vortex street
in a vortex meter and of the secondary rotation in a swirl meter are each directly proportional to the volumetric flowrate of the fluid, there is no need to compensate for changes in pressure, temperature or density.
It indicates that the Strouhal number of the unsteady flow is 0.1956, which is very similar to that of the Karman vortex street
In the lab, I used a cylinder to simplify turbulence and generate an organized pattern of eddies, called a Karman vortex street
. This vortex street
is the name given to the consistent pattern of eddies that spin off in a line downstream of a cylinder.
The noise of rotation is due to the adhesion of the air and leafs, resulted in velocity gradient, formed on turbulent boundary layer noise by the vane's surface boundary layer pulse, and it will decline gradually with in increase of the fan speed; The vortex noise is a kind of strong noise which is made by the local pulse power (SHEN & XIE, 2004) with a more narrow frequency characteristics, and the power is made by the Karman Vortex Street
of vane trailing.
Formulation vortex street
, Journal of AppliedPhysies, 24, No.
In addition, a series of vortices known together as a vortex street
will be shed in the wake of the tower.
Further, in the instance of the stadium with all its structural appurtenances, and deformities, when the winds swirl about they create the eddies and whorls of what is also known in fluid mechanics as a von Karman vortex street
. This would account for winds coming from every conceivable direction during the course of a ballgame, contributing to erratic ball trajectories by batters and quarterbacks, not to mention the discomfiture of fans in the stands.
This characteristic vortex pattern is known as the Karman vortex street
, after the great Hungarian-born American aerodynamicist, Theodore von Karman.
My overwhelming first thought was to try and produce a work with movement to mimic the von Karman vortex street
. That said, how to end up with such a work seemed like a huge if not impossible task.
The frequencies of the vortex street
in a vortex meter and of the secondary rotation in a swirl meter are each directly proportional to the volumetric flow rate of the fluid.
There is no independent vortex street
between two cylinders.