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Design, construction and active control of a travelling wave thermoacoustic machine


L. Moser

Master Thesis, FS15 (10460)

In this master thesis the design, construction and experimental results of a one-wavelength travelling-wave looped-tube thermoacoustic machine are presented. The thermoacoustic machine is able to generate acoustic power through a temperature gradient which is imposed across a regenerator. The simulated device further consists of a cooler and an audio loudspeaker which is employed as an alternator to produce small amounts of electricity.
The design of the travelling-wave thermoacoustic machine is based on the linear thermoacoustic theory. To numerically calculate the optimal device, the so called design environment for low amplitude thermoacoustic energy conversion software tool was incorporated. Air at atmospheric pressure was employed. The simulated device has an acoustic frequency of 57.9 Hz. According to the simulation, at a temperature difference of 208_C it is possible to generate 20 W of acoustic power and to produce 1 W of electrical power. At this temperature difference a thermal-to-acoustic efficiency of 6.2% can be obtained which is very good considering the fact that air at atmospheric pressure is employed.
The mechanical parts were designed such that a modular system design could be achieved. This is important to guarantee experimental flexibility and to simplify the maintenance. Where possible, components out of polymer were used in order to simplify the manufacturing process and to reduce the costs.
The first experiments show that the TAM which so far only consists of the engine and the thermal buffer tube has a frequency of 58 Hz and can generate a maximum pressure amplitude of 4900 Pa at the location of the pressure measurement. Further the calculations show that a maximum acoustic power of 12.3 W can be reached at an electric power supply of 418.5 W. This corresponds to a maximum thermal-to-acoustic efficiency of 2.94 %.

Supervisor: Dr. Stanislaw Pietrzko, Prof. Dr. Roy Smith


Type of Publication:

(12)Diploma/Master Thesis

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% Autogenerated BibTeX entry
@PhdThesis { Xxx:2016:IFA_5472
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