Windmill SAMIRA: A Case Study of an Intermediate Technology Design

Tewari, SK (1987) Windmill SAMIRA: A Case Study of an Intermediate Technology Design. Project Report. National Aerospace Laboratories, Bangalore.

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Some experiments at prototype scale regarding design and development of small (under 5 kw) low cost windmills are described in this paper. The nature of the technology used in these designs is characterized as intermediate from the point of view of fabrication. A basic objective in these experiments has been that the design should be such that it should not require large production facilities. At the same time it should be possible to exercise a control on specifications and dimensions. A design discussed: in this paper has been aimed at replacing positive displacement pumps used in conventional windmills by centrifugal pumps which are more rugged in water lifting applications such as irrigation. The rotor and the transmission are then designed to suit such pumps. Initial experiments were conducted with triangular sail rotors and later with trapezoidal platforms incorporating an innovative regulation device called SATS. .Recent studies, carried out with medium solidity metal vane rotor provided with an innovative slat cum spoiler arrangement are discussed. This arrangement is self actuated. A simple and inexpensive implementation is being tested on a few prototypes. Justification for the choice of cambered plate in place of thick airfoils and for use of spar-rib framework in place of integral construction is offered as being appropriate in low cost small windmills.

Item Type: Monograph (Project Report)
Uncontrolled Keywords: Auxiliary airfoil, rotary transmission, rotodynarnic pump, slat, spoiler.
Subjects: RENEWABLE ENERGY > Wind Energy
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Ms Indrani V
Date Deposited: 09 Jan 2012 10:34
Last Modified: 09 Jan 2012 10:34

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