Performance characteristics of car alternator coupled directly to micro gas turbine (mgt)
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Date
2018-05
Authors
Lim, Ching Hock
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Abstract
Rural area of Malaysia are facing problem getting power and heat supply. They
have diesel engine but diesel have transportation problem and only supply energy not
heat. Although rural area are full of biomass, it is not suitable used in diesel engine.
Micro Gas Turbine (MGT) is smaller version of gas turbine which is the solution to
rural area problem where it can run with any fuel type while provide both energy and
heat but it is expensive. The current work is about developing a turbocharger MGT
coupled to a generator which is more affordable. Selection of poor transmission will
cause power loss to friction, high vibration and misalignment thus breakdown. Problem
in pinpoint the possible defect in setup and extracting power from generator. The
unsuitable extraction method will lead to most power used to overcome friction. A
direct coupling was develop to connect an alternator to MGT for electrical power
generation where the MGT was powered by a blower. The performance of the setup
was evaluated by conducting vibration analysis. A suitable method for electrical output
characterization was developed. There a total of three coupling developed for the setup
and the one which are suitable is friction coupling. The setup was able to run up to
maximum speed of about 12000rpm. For electrical output, alternator’s rotor was
externally excited and magnetic flux is induced by the rotation of rotor by MGT through
friction coupling. The suitable excitation power was determined experimentally.
Maximum output power of the setup and its relationship to the rotational speed were
determined by load characterization experiment with optimum excitation power.
Vibration analysis shows that friction coupling have lower vibration amplitude compare
to metal coupling from previous work. Parallel and angular misalignment become less
severe as speed increased for friction coupling. The best excitation power for the
alternator’s rotor is 0.81W with 18.33Ω. The maximum electrical output shows linear
relationship with the rotational speed thus it is not affected by other parameter.
Maximum output power with optimum power input is about 50W for current setup.