Axial Backflow

The conical inner wall KW (shaded in grey) needs to be attached to the outer parts of the housing G (also shown shaded grey) with spike-rods C (shown in dark blue). The backflow-conduit is positioned all the way around the turbine, and it has a ring-shaped cross-sectional area. The water in this conduit flows with a rotational angle of about 60 degrees, so these cross-beams should be shaped like fins to push the flow into a somewhat greater angular flow of about 75 degrees, towards the right.

The cross-sectional area of the ring-shaped backflow-conduit D (light blue) is relatively large, so there is little friction at it's surface. Water will move relatively slowly towards the right when in that conduit. This area represents a 'buffer' for the water flow as water there can move towards the right, adjusting it's rate of rotation as it flows along.

Another new constructional element here are the fins E (shown in dark blue), which function like a stator. Unlike the previous examples, here the flow is directed into a straight axial flow direction (from left to right without any rotation). In the backflow-conduit D, the water is still moving with a more or less spiral track. Consequently, the left hand ends of fins E should be rounded to avoid any frictional losses, while the right hand edges of these fins should end sharply.

Unlike the few cross-beams C, about 12 to 18 cross-beams E should be installed. The cross-sectional area of the conduits becomes less, so the water accelerates accordingly. Unlike the previous enlargement of the cross-sectional area, this narrowing does not affect resistance. Water is now directed parallel to the system axis by these fins E. The water there is not rotating around the system axis and so does not have any centrifugal force acting radially outwards from the system axis.

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