12th Mar, 2021

NED University of Engineering and Technology, Karachi

Question

Asked 9th Jun, 2015

Hi there! I am trying to find out the optimal rotor speed and power coeficiente. southwest windpower manufacturer: Air 40 .Data: Rated power- 160 watts @ 12.5 m/s wind speed ,diameter - 1.17 m. How can I calculate the power coefficient(cp) and optimal tip speed ratio. Is there any reference study about it?

Use Qblade software, it will give you Cp, TSR, and other required parameters.

Hello;

You have two cases:

1. You have the equation of power coefficient Cp = f ( Vwind ) .

In this case you can directly calculate the value of the Cp for each value of wind speed Vwind ( For each value of the wind speed, there is an optimum rotor speed for which the power coefficient Cp will be optimal).

So you can get the optimum power coefficient Cp and the optimum rotation speed directly from the Cp equation.

2. You do not have the equation of power coefficient.

In this case you must use power optimization algorithm ( MPPT ) as P & O , PSO ...

5 Recommendations

**Get help with your research**

Join ResearchGate to ask questions, get input, and advance your work.

You could try to model the wind blade a a propeller, except that the rotation is generated by the wind (and not the other way round).

You will find the needed equations under "Propeller theory" in a helicopter dynamics textbook

Hello;

You have two cases:

1. You have the equation of power coefficient Cp = f ( Vwind ) .

In this case you can directly calculate the value of the Cp for each value of wind speed Vwind ( For each value of the wind speed, there is an optimum rotor speed for which the power coefficient Cp will be optimal).

So you can get the optimum power coefficient Cp and the optimum rotation speed directly from the Cp equation.

2. You do not have the equation of power coefficient.

In this case you must use power optimization algorithm ( MPPT ) as P & O , PSO ...

5 Recommendations

11th Jun, 2015

Calculation of Cp vs tip-speed-ratio relation is not straight forward. Consult a standard wind energy text such Wind Power Handbook or Wind Energy Explained. If the turbine is commercial, the manufacturer should provide its performance curve (determined experimentally).

3 Recommendations

Article

Full-text available

- Aug 2000

A general method is shown here to model wind loads and responses for reliability applications. This method characterizes the short-term loads and responses by a few summary statistics: specifically, by a limited number of statistical moments. A suite of moment-based models are derived and applied here, illustrating how this statistical moment infor...

Get high-quality answers from experts.