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1 th MME’02, The 13 Micromechanics Europe Workshop, October 6-8, 2002, Sinaia, Romania 1 bar 0.8 bar 0.7 bar 0.6 bar 0.5 bar 0.2 bar Friction torque 3.5 3 2.5 2 1.5 The ‘dips’ in the characteristics at high speed are caused by the measurement method as they always occur at the maximal speed, even for different loads and pressures. In reality, power and efficiency increase further with speed to reach their maxima theoretically at 210,000 rpm (for 1 bar). These speeds can be reached using a smaller load. VI. ELECTRICAL OUTPUT To measure the electrical power output of the system, the generator is connected to a variable 3- phase load consisting of 3 potentiometers (range 2 kΩ, 10 turns). In contrast with the mechanical tests, the electrical tests are performed at constant speed. The speed of the turbine, which is measured from 0.5 0 Speed (rpm) x 10 Fig. 5. Torque as a function of speed and supply pressure. 30 25 20 0 20 40 60 80 100 120 3 18 16 14 12 10 1 bar 0.9 bar 0.8 bar 1 bar 0.8 bar 0.7 bar 0.6 bar 0.5 bar Friction loss 0.2 bar 15 8 10 6 4 0.6 bar 0.5 bar 52 0.4 bar 0.3 bar 0 20 18 16 14 12 10 8 6 4 2 0 0 0 20 40 60 80 100 120 140 160 0 20 40 60 80 100 120 Speed (rpm) 3 x 10 Speed (rpm) Fig. 6. Mechanical power of the turbine. 3 x 10 0.2 bar 0.7 bar 1 bar 0.8 bar 0.7 bar 0.6 bar 0.5 bar 0.4 bar 0.3 bar 0.6 bar 0.5 bar 0.7 bar 0.8 bar 1 bar 0.9 bar 0.2 bar 0 20 40 60 80 100 120 Fig. 8. Electrical power generated by the total system (turbine plus generator). 12 10 8 6 4 2 0 0 20 40 60 80 100 120 140 160 3 Speed (rpm) x 10 Fig. 9. Total efficiency (compressed air to electricity). Speed (rpm) Fig. 7. Efficiency of the turbine (compressed air to mechanical power). 3 x 10 277 Turbine efficiency (%) Mechanical power (W) Torque (Nmm) Total efficiency (%) Electrical power (W)PDF Image | A MICROTURBINE FOR ELECTRIC POWER GENERATION
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