Results with
Loads
offering Resistance to Flow 
For
analysis of the accelerator models efficiency, with loads offering
resistance to flow, several graphs were plotted:

Characteristic
of the ratio Vt/Vc between the flow velocity Vt
measured before the load (for Loads L1, L2, and L3) in the
narrower channel zone and the stream velocity Vc, as a function of the stream velocity
Vc.

Characteristic
of the pressure P measured transversaly to the flow
direction before the load (for Loads L1, L2, and L3) in the
narrower channel zone,
as a function of the stream velocity Vc.

Characteristic
of the pressure P measured transversaly to the flow
direction before the load (for Loads L1, L2, and L3) in the
narrower channel zone,
as a function of the velocity Vt at the same point.

Characteristic
of the available Head DH
before the turbine, as a function of the flow velocity Vt, given
by the expression DH
= (Vt^{2}/2g) + P/g
.


Load
L1
58%
obstruction
Load
L2
72%
obstruction
Load
L3
82%
obstruction


Load
L1
58%
area obstruction 




Load
L2
72%
area obstruction 




Load
L3
82%
area obstruction 




Analysis of Results with Loads offering Resistance to Flow


Model
A1 causes for a considered stream velocity Vc, higher flow velocity
Vt and transversal pressure P before a specific Load
than Model A2. Consequently the available head DH
before a specific Load is higher for Model A1 than for Model A2.
The results confirm that Model A1 is more efficient than Model A2.

For
a specific stream velocity Vc, the flow velocity Vt is
as more higher as less obstructing is the Load located in the
narrower channel zone.

As
more obstructing is Load, higher is stream velocity Vc
beyond which starts flowing through the channel. The results show,
that with 82% channel area obstruction (Load L3), the stream
velocity Vc beyond which starts flowing is 1 m/s (2 knots) with
Model A1 and 1,25 m/s (2,5 knots) with Model A2. The stream velocity Vc
beyond which starts flowing tends to 0,75 m/s (1,5 knots) or to 0,5
m/s (1 knots) for Model A1 respectively with 72% channel area obstruction
(Load L2) or 58% channel area obstruction (Load L1).

For
a specific stream velocity Vc, the available head DH
before the Load, is almost independent of the used Load (L1, L2
or L3), being equivalent to the available head through this zone in
the absence of any flow constraints. This is only valid for not
extremelly obstructing Loads that do not imply rejection of energy flow
through the channel. The following table resumes the results obtained with Model
A1, for stream velocities of 1,25 m/s (2,5 knots) and 1,75 m/s (3,5
knots).
