On a fluidic pump system with vortex diodes, the effects of the system parameters and the operating conditions on the pumping characteristics are studied theoretically and experimentally. In this system the delivery pipe is connected to the top of the upper tank, unlike in the previous study. The pump is equipped with Zobel-type diodes (chamber diameter: 6 and 12cm, height: 1 and 2cm) and driving cylinders (diameter: 15 and 22cm), and is tested under some delivery heads 1-10.7m.
The results obtained are as follows:
(1) The calculated results agree well with the experimental ones.
(2) There is an optimum mean liquid level in the driving cylinder, at which the timemean delivery flow rate Q takes the maximum.
(3) There is an optimum driving air supply pressure p⁺₀ for the given delivery head H, which maximize the pump efficiency η. The value is given by p⁺₀=ρgH/0.8.
(4) To increase η and Q, it is necessary that the discharge volume of the driving cylinder is reasonably large in comparison with the volume of the delivery pipe.
(5) There is an optimum diameter of delivery pipe, which maximize η and Q under given operating conditions.