Vortex generator

1. A vortex generator apparatus for mixing of fluids comprising:

a fluid intake duct;

a fluid tank comprising:

a first fluid inlet port in fluid communication with the fluid intake duct,

a second fluid inlet port, and

a fluid outlet port;

a turbine provided

outside of the fluid tank

in fluid communication with the fluid outlet port;

wherein the vortex generator apparatus comprises a fluid outlet duct in fluid communication with the fluid outlet port and wherein the turbine is located within the fluid outlet duct; and

wherein the fluid outlet duct has a divergent wall section surrounding the turbine.

2. The vortex generator apparatus as claimed in claim 1 wherein:

the fluid tank defines a substantially cylindrical swirl chamber,

centred on a fluid rotational axis;

the second fluid inlet port,

fluid outlet port; and

turbine

also being centred on the fluid rotational axis.

3. The vortex generator apparatus as claimed in claim 2 wherein:

the second fluid inlet port; and

the fluid outlet port

are centred on the fluid rotational axis at opposite sides of the fluid tank; and

the fluid outlet port is spaced between the second fluid inlet port and the turbine.

4. The vortex generator apparatus as claimed in claim 2 , wherein:

the fluid intake duct is:

provided substantially on a tangent to a side wall of the fluid tank; and

aligned to deliver fluid to an internal surface of the fluid side wall to thereby induce swirl about the fluid rotational axis.

5. The vortex generator apparatus as claimed in claim 2 , wherein

the fluid outlet port comprises an extended mouth which extends towards an inlet of the turbine; and

the extended mouth comprises an outlet having a diameter which is smaller than the diameter of the turbine inlet.

6. The vortex generator apparatus as claimed in claim 5 , wherein

a vent hole is provided in the wall of the duct downstream of the extended mouth outlet and upstream of the turbine inlet.

7. The fluid working system comprising a fluid working apparatus as claimed in claim 6 , comprising:

a first fluid reservoir;

the fluid pump being in fluid communication with the first fluid reservoir to thereby extract fluid from the fluid reservoir;

a second fluid source; and

the second fluid inlet port being in fluid communication with the second fluid source.

8. The fluid working system as claimed in claim 7 , wherein

the swirl chamber outlet duct exit is submerged beneath the surface of the first fluid in the first fluid reservoir

to thereby deliver a mix of the first fluid and second fluid to the first fluid reservoir.

9. The fluid working system as claimed in claim 8 , comprising:

a support structure which maintains the swirl chamber above the level of the surface of the fluid in the first fluid reservoir.

10. The vortex generator apparatus as claimed in claim 1 , wherein:

the fluid outlet duct further comprises, in series with the divergent wall section:

a parallel wall section; and

a convergent wall section terminating at a duct exit.

11. The vortex generator apparatus as claimed in claim 1 , wherein

a shaft extends from the turbine.

12. The vortex generator apparatus as claimed in claim 11 wherein:

the shaft extends from the turbine,

through the fluid outlet port,

through the fluid tank, and

through the second fluid inlet port.

13. A fluid working apparatus comprising a vortex generator as claimed in claim 1 .

14. The fluid working apparatus as claimed in claim 13 further comprising:

a fluid delivery apparatus in flow communication with the fluid intake duct;

the fluid delivery apparatus comprising a fluid pump.

15. The vortex generator apparatus as claimed in claim 1 wherein:

the turbine comprises one or more turbine blades, and

the divergent wall section encircles the one or more turbine blades.

16. A vortex generator apparatus for mixing of fluids comprising:

a fluid intake duct;

a fluid tank comprising:

a first fluid inlet port in fluid communication with the fluid intake duct,

a second fluid inlet port, and

a fluid outlet port;

a turbine provided outside of the fluid tank in fluid communication with the fluid outlet port; wherein

the vortex generator apparatus comprises a fluid outlet duct in fluid communication with the fluid outlet port and the turbine is located within the fluid outlet duct;

the fluid outlet duct has a divergent wall section around the turbine; and

a shaft extends from the turbine, through the fluid outlet port, through the fluid tank, and through the second fluid inlet port.

17. A vortex generator apparatus for mixing of fluids comprising:

a fluid intake duct;

a fluid tank comprising:

a first fluid inlet port in fluid communication with the fluid intake duct,

a second fluid inlet port, and

a fluid outlet port;

a turbine provided outside of the fluid tank in fluid communication with the fluid outlet port; wherein

the vortex generator apparatus comprises a fluid outlet duct in fluid communication with the fluid outlet port and wherein the turbine is located within the fluid outlet duct;

the fluid outlet duct has a divergent wall section around the turbine;

the fluid tank defines a substantially cylindrical swirl chamber centred on a fluid rotational axis;

the second fluid inlet port, the fluid outlet port, and the turbine also are centred on the fluid rotational axis;

the fluid outlet port comprises an extended mouth which extends towards an inlet of the turbine;

the extended mouth comprises an outlet having a diameter which is smaller than the diameter of the turbine inlet; and

a vent hole is provided in the wall of the duct downstream of the extended mouth outlet and upstream of the turbine inlet.