The aim of this work is to investigated the performance of the Axial Flow Turbine prototype integrated with the Permanent Magnet Generator (PMG). The integration of this turbine is to mounted the permanent magnet ring to the propeller tip as a generator rotor, and resulted a simple construction and no need couple between turbine and rotor generator shaft. The stator is located on external of stationary part of the turbine, immediate to the turbine casing. The design of axial flow turbine for this purpose used the non conventional approach, due to the low head (less than 2 meter) and very view information available on the low head axial turbine. Non conventional turbine design, using the principle of radial balance, minimum pressure criteria and inverse design.
The power output is however limited by flow of water which is sufficient to keep generate a suitable number of revolutions per minutes. The designed turbine parameters are based on the available water flow laboratory facility with flow rate of 128 liters/s and available head of 0.3 meters. The Axial Flow Turbine has number of blade for stator and rotor are 24 and 8 blades respectively. The tip and hub diameters of turbine are 600 mm and 360 mm respectively. Turbine will be operated on the rotating speed of 90 rpm. The specification of single phase permanent magnet generator as follow power output of 300 W at 220 V, rotational speed of 90 rpm using the skewing magnet on the rotor. Numerical studies of optimized turbine has successfully demonstrated with a very good performance and the PMG has been tested before put to the system. The result of axial flow turbine with Permanent system test has power of 439 Watt at 219.7 V, 50 Hz and rotational speed of 83 rpm. Efficiency total maximum system achieving of 87% at condition power maximum of 820 Watt, 149.1 V, 50 Hz and rotational speed of 83 rpm. System operate at average effective head 0.3 m and average water flow in canal 0.3 m/s.
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