Please enable JavaScript.
Coggle requires JavaScript to display documents.
Hull Efficiency - Coggle Diagram
Hull Efficiency
Quasi-propulsive coefficient
\(\eta_D=\dfrac{Effective power}{Delivered Power}=\dfrac{P_E}{P_D} \)
se \(P_D=\dfrac{TV_A}{\eta_B} \)
Deselvonvendo
"Dinheiro"
\( \eta_D=\eta_H \eta_R \eta_0 \)
Quasi propulsive eff = Hull eff x Relative Rotative Efficiency x Open Propeller eff
Work
move ship of Speed \(V\) against Resistance \(R_T\)
Proportional to
\( P_E=R_TV \)
done by propeller delivering Thrust \(T\) at Speed \(V_A\)
\( P_T=TV_A \)
Hull Efficiency
Ratio of Work done on ship to the Work done by the screw
\( \eta_H=\dfrac{P_E}{P_T}=\dfrac{R_TV}{TV_A}\)
Taylor Notation
\(\eta_H= \dfrac{1-t}{1-w}\)
Froude Notation
\(\eta_H=(1+w_F)(1-t)\)