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DYNAMIC PERFORMANCE OF A STRAIGHT-BL...

NATTUVETTY, VISWAMBHARAN RAMAN.

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DYNAMIC PERFORMANCE OF A STRAIGHT-BLADED VERTICAL-AXIS CYCLOTURBINE UNDER VARIOUS OPERATING CONDITIONS.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	DYNAMIC PERFORMANCE OF A STRAIGHT-BLADED VERTICAL-AXIS CYCLOTURBINE UNDER VARIOUS OPERATING CONDITIONS./
Author:	NATTUVETTY, VISWAMBHARAN RAMAN.
Description:	228 p.
Notes:	Source: Dissertation Abstracts International, Volume: 42-10, Section: B, page: 4125.
Contained By:	Dissertation Abstracts International42-10B.
Subject:	Engineering, Agricultural. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8129676

DYNAMIC PERFORMANCE OF A STRAIGHT-BLADED VERTICAL-AXIS CYCLOTURBINE UNDER VARIOUS OPERATING CONDITIONS.
NATTUVETTY, VISWAMBHARAN RAMAN.

DYNAMIC PERFORMANCE OF A STRAIGHT-BLADED VERTICAL-AXIS CYCLOTURBINE UNDER VARIOUS OPERATING CONDITIONS. - 228 p.

Source: Dissertation Abstracts International, Volume: 42-10, Section: B, page: 4125.

Thesis (Ph.D.)--Cornell University, 1981.

The purpose of this investigation was to develop a theoretical model to predict the performance parameters of a vertical-axis cycloturbine when both the wind velocity and angular speed of rotation are time dependent. Presented in this thesis is the development of such a model and also the computer programs to solve for the performance parameters under a given operating condition. The various operating conditions studied are: the operation under constant speed of rotation, the operation with a linear load, the operation with a water-heating agitator and the operation at constant tip speed ratio. It has been observed that the performance of the system is highly dependent on the operating mode chosen. The water-heating agitator which develops a resistive torque proportional to the square of its angular speed of rotation matches the wind turbine very well giving maximum efficiency of power conversion under steady wind conditions. Under time-variant wind conditions, the inertia of the rotating parts adversely affects the performance of the system. The system efficiency is found to be the lowest in the case of the operation at constant angular speed and the highest in the case of the operation at constant tip speed ratio. It is also shown that the operation at constant tip speed ratio requires an active load, i.e., a load that can feed energy into the system sometimes and take energy out at other times. Among various other findings of this investigation are the effects of the amplitude of the angular pitch variation on the performance. The lower the amplitude, the higher is the performance curve. The best desirable operation can be achieved if the angular pitch is varied both with respect to the position of the blade and the tip speed ratio. An experimental verification of the theoretical predictions was done with the data collected on a 3.65m x 2.4m Pinson Cycloturbine installed in Harford, New York.Subjects--Topical Terms:

1019504
Engineering, Agricultural.

DYNAMIC PERFORMANCE OF A STRAIGHT-BLADED VERTICAL-AXIS CYCLOTURBINE UNDER VARIOUS OPERATING CONDITIONS.
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100 1 $a NATTUVETTY, VISWAMBHARAN RAMAN. $3 1271198
245 1 0 $a DYNAMIC PERFORMANCE OF A STRAIGHT-BLADED VERTICAL-AXIS CYCLOTURBINE UNDER VARIOUS OPERATING CONDITIONS.
300 $a 228 p.
500 $a Source: Dissertation Abstracts International, Volume: 42-10, Section: B, page: 4125.
502 $a Thesis (Ph.D.)--Cornell University, 1981.
520 $a The purpose of this investigation was to develop a theoretical model to predict the performance parameters of a vertical-axis cycloturbine when both the wind velocity and angular speed of rotation are time dependent. Presented in this thesis is the development of such a model and also the computer programs to solve for the performance parameters under a given operating condition. The various operating conditions studied are: the operation under constant speed of rotation, the operation with a linear load, the operation with a water-heating agitator and the operation at constant tip speed ratio. It has been observed that the performance of the system is highly dependent on the operating mode chosen. The water-heating agitator which develops a resistive torque proportional to the square of its angular speed of rotation matches the wind turbine very well giving maximum efficiency of power conversion under steady wind conditions. Under time-variant wind conditions, the inertia of the rotating parts adversely affects the performance of the system. The system efficiency is found to be the lowest in the case of the operation at constant angular speed and the highest in the case of the operation at constant tip speed ratio. It is also shown that the operation at constant tip speed ratio requires an active load, i.e., a load that can feed energy into the system sometimes and take energy out at other times. Among various other findings of this investigation are the effects of the amplitude of the angular pitch variation on the performance. The lower the amplitude, the higher is the performance curve. The best desirable operation can be achieved if the angular pitch is varied both with respect to the position of the blade and the tip speed ratio. An experimental verification of the theoretical predictions was done with the data collected on a 3.65m x 2.4m Pinson Cycloturbine installed in Harford, New York.
590 $a School code: 0058.
650 4 $a Engineering, Agricultural. $3 1019504
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710 2 $a Cornell University. $3 530586
773 0 $t Dissertation Abstracts International $g 42-10B.
790 $a 0058
791 $a Ph.D.
792 $a 1981
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