| 摘要 |
A vortex-shedding mass flowmeter which includes a shedding body mounted in a pipe containing a flowing fluid, a first detecting element that responds to the vortices generated when the fluid flows past a surface of the shedding body for producing a velocity signal proportional to the flow rate of the fluid, a second detecting element for sensing in a measuring plane that includes the surface of the shedding body where vortices are generated a moving fluid characteristic dependent on the product of fluid density and the square of the fluid flow rate, and electronic circuitry coupled to the outputs of the first and second detecting elements for producing therefrom a mass flow rate signal. In one preferred embodiment, the second detecting element is a pitot-type head device which senses a pressure differential between static and dynamic pressures existing at two locations on the measuring plane. In another preferred embodiment of the present invention, the second detecting element includes a drag body flow device which responds to the force being applied thereto by the flowing fluid. |
