Abstract
Vortex shedding frequency generated by bluff body is proportional to flow velocity even in three dimentional flow.
By means of this hydrodynamic phenomenon-so-called karman vortices, vortex flowmeter went on sale approximately ten years ago, but generally not were used as industrial floweter.
In recent years, however, applications of vortex flowmeters are increasing widely.
That is because characteristic advantages of this flowmeter are acknowledged generally, and new approach to sensing vortex frequency makes this flowmeter possible to operate under severe flow conditions.
This paper describes “stress sensing system”-piezo electric element builtin vortex shedder senses internal stress in bluff body which results from the lift caused by vortex shedding. And measurements involving high-temperature and high-pressure gas, steam and liquid flow are all possible.
