Typical Results
All results are for reference only. Actual results may differ slightly.
Table 5 Typical Results
All results gave fairly linear plots, showing that the force produced on the vanes is proportional to the rate of momentum. Table 6 shows the approximate gradients.
Table 6 Approximate Gradients
Actual results are very similar to theory, but overall slightly lower. This suggests that the measured forces were lower than expected or the momentum was higher than expected. A consistent measurement error would make the plots pass just above or below the 0,0 origin, so it is more likely to be due to other factors that the ‘ideal’ theory does not account for. For example, the theory assumes a uniform velocity distribution around the jet and on the vane, but a real jet has a parabolic distribution with a slightly higher velocity in the centre.