Integral propeller turbine induction generator units for village hydroelectric schemes

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Demetriades, G.M., 1997. Integral propeller turbine induction generator units for village hydroelectric schemes. PhD, Nottingham Trent University.

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Abstract

Integral propeller turbine-induction generator units for village hydroelectric schemes By : Georgios Manoli Demetriades Stand alone micro - hydroelectric schemes, especially where grid extension is not feasible, have long been acknowledged as an appropriate way of village electrification in developing countries.

This thesis describes an investigation into propeller turbines that are suitable for low head micro hydroelectric schemes due to their high specific speeds and their compact design which allows them to be easily transported. In addition, their direct coupling to generator sets offers several advantages over belt drive systems and gearboxes such as improved system efficiency, increased turbine and generator bearing lifetime, reduced costs, lower maintenance requirements and simplicity of installation.

A review of existing low head turbine technology shows that no design is appropriate for use in developing countries, either because of high costs or the technology is unsuitable for local manufacture and/or maintenance.

The thesis presents the design, development and testing of an integral propeller turbine- induction generator unit, which utilises as much of the local skills and materials as possible. Pipe sections can be incorporated into the design as a result of tailoring turbine dimensions to standard sizes which therefore minimise fabrication costs. The runner blades are made of constant thickness metal sheets, bent and twisted. Test results show that the performance of the turbine is sensitive to the geometrical accuracy of the blades which were difficult to form to the design angles. Moreover, a systematic loss analysis using the experimental data pinpointed inaccuracies in the original design assumptions. Despite this, a turbine efficiency of 53% was achieved, which compares favourably with existing designs.

Based on the knowledge and experiences gained from this research project, the thesis includes proposals for use of criteria and procedures which are likely to lead to a more successful design of propeller turbines for village hydroelectric schemes.

Item Type:

Thesis

Creators:

Demetriades, G.M.

Date:

1997

ISBN:

9781369323610

Identifiers: