CR4 - Thread: Tip Speed Ratio of Wind Turbine Blades

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Guest	Tip Speed Ratio of Wind Turbine Blades 07/03/2009 3:32 AM
	is there any method or formula for calculating tip speed ratio of wind turbine prop.there r three blades which r at 120 degree to each other it is made up of PVC pipe the average wind speed is 10-9 mph.Length of one blade is 0.5m
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Guest	#1 Re: tip speed ratio 07/03/2009 3:38 AM
	http://www.mh-aerotools.de/airfoils/jp_propeller_design.htm

nick name Guru Join Date: Mar 2007 Location: City of Light Posts: 1736 Good Answers: 40	#2 Re: Tip Speed Ratio of Wind Turbine Blades 07/03/2009 9:04 AM
	If you use the word "ratio" you should clearly indicate to what reference the ratio has to be done. There are differences between "propellers" which are active and wind turbine which are passive this means the propeller generates a flow using energy and the wind turbine rotor harvests energy from the wind. Conditions are not the same so that the equations for one function cannot be used for the second without analysis of compatibility.

Milo Guru Join Date: Jul 2006 Location: "Dancing over the abyss." Posts: 3204 Good Answers: 164	#3 In reply to #2 Re: Tip Speed Ratio of Wind Turbine Blades 07/03/2009 9:53 AM
	I agree with nickname that the term 'ratio' presupposes another factor for comparison. calculating the 'surface feet per minute of the tip" would be the same as for a tool, or a tire (rpm times diameter times pi) = surface feet travelled by the tip per minute times sixty = feet travelled per hour divided by 5280 = miles per hour. Ratio? compared to what? milo __________________ People say between two opposed opinions the truth lies in the middle. Not at all! Between them lies the problem, what is unseeable,eternally active life, contemplated in repose. Goethe

rajeshbhanushali123 Commentator Join Date: Jun 2009 Location: India-maharashtra-kalyan Posts: 56	#6 In reply to #2 Re: Tip Speed Ratio of Wind Turbine Blades 07/04/2009 6:21 AM
	the ratio is with respect to wind speed (tsr=tip speed/wind speed) i know wind speed but how to calculate tip speed of blade.the configuration is mention above.

nick name Guru Join Date: Mar 2007 Location: City of Light Posts: 1736 Good Answers: 40	#7 In reply to #6 Re: Tip Speed Ratio of Wind Turbine Blades 07/04/2009 9:48 AM
	You think "propeller" and not "turbine" ! The propeller can get a tip speed imposed by its motor/engine, the turbine will turn at a speed function of wind speed, rotor design and load so that you cannot impose a speed, the speed is a *resulting* parameter ! Depending on several factors there is an optimal speed ratio by which the power output is maximal but it is function of rotor design so that.... You will ask why an optimal ratio ? Let me explain why: 1-assume the rotor does not turn the wind will apply the highest torque but speed is zero so that the power output is nil. 2- assume you turn the turbine so that the wind force is zero although the speed is important the torque is zero since the wind torque depends on relative speed between turbine and wind. This means that either for speed zero or for speed maximal the power output is nil. It must be some speed in between giving the maximal power function of rotor design. This is the optimal ratio.

Bill Guru Join Date: Dec 2005 Location: Clemson, South Carolina Posts: 1606 Good Answers: 12	#4 Re: Tip Speed Ratio of Wind Turbine Blades 07/03/2009 3:15 PM
	Tip speed vs wind speed? Determined by propeller design, and it probably isn't linear. __________________ We have met the enemy and he is us . . . Walt Kelly

nick name Guru Join Date: Mar 2007 Location: City of Light Posts: 1736 Good Answers: 40	#5 In reply to #4 Re: Tip Speed Ratio of Wind Turbine Blades 07/03/2009 6:53 PM
	Linear or no linear with respect to what?

Bill Guru Join Date: Dec 2005 Location: Clemson, South Carolina Posts: 1606 Good Answers: 12	#8 In reply to #5 Re: Tip Speed Ratio of Wind Turbine Blades 07/07/2009 9:40 AM
	WRT wind speed __________________ We have met the enemy and he is us . . . Walt Kelly

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