Open water curves - B-Series propeller
The calculator generate the open water curves for a Wageningen B-Series propeller. Input needed is the number of propeller blades, the pitch-diameter ratio and the expanded area and with that a plot and a table of the thrust coefficient, torque coefficient and the open water efficiency as function of the advance ratio is obtained.
\begin{align}
K_T &= \frac{T}{\rho n^2D^4}\\
K_Q &= \frac{Q}{\rho n^2D^5}\\
J &= \frac{V_A}{nD}\\
\eta _O &=\frac{K_T}{K_Q}\frac{J}{2\pi }
\end{align}
The open water curves for B-Series propellers are valid for Reynolds number Rn=2×106
hence adjustment is needed for higher if the Reynolds numbers.
Limitations are:
\begin{align}
2\leq & Z\leq 7\\
0.5\leq & P/D\leq 1.4\\
0.3\leq & A_E/A_O\leq 1.05
\end{align}
| Symbol | Description |
|---|---|
| KT | Thrust coefficient |
| KQ | Torque coefficient |
| J | Advance ratio |
| ηO | Open water efficiency |
