Magnetohydrodynamic Generator Driven by a Thermoacoustic Engine
Artūrs Brēķis

19.04.2023. 10:00, Rīgas Tehniskās universitātes Elektrotehnikas un vides inženierzinātņu fakultāte, Āzenes iela 12/1, 212. auditorija.

Agris Gailītis, Andrejs Podgornovs

Jānis Dainis Dirba, Andris Jakovičs, Valdis Bojarevičs

Present Doctoral Thesis is devoted to a new type of energy converter for Deep Space applications. It consists of a unique alternating current magnetohydrodynamic generator with liquid sodium as a working body, and thermoacoustic engine, which drives the generator, by forcing the liquid metal to oscillate in the magnetic field. The main novelty of this work is that both technologies – MHD generator and thermoacoustic engine – are coupled in one device, that is called “SpaceTRIPS”, which has not been done anywhere in the world before. In the PhD thesis an analytical, numerical and experimental investigation is performed to study present technology, as well as construction and building of the whole facility itself. Focus of the research is aimed mostly on “SpaceTRIPS” part of the AC MHD generator and on the questions related to them. There are developed mathematical models of the generator that are based on electrical transformer equivalent circuit approach, and also on the basis of the Maxwell equations. Developed models are used, to assess and to study different parameters of the electrical machine in the wide range of values. There have been laboratory experiments performed with each of the machines, both, separately and coupled, and measurement results are compared with theoretical calculations. It is shown that by using possibilities, that thermoacoustic technologies offer, it is possible to obtain liquid metal vibration type movement that is capable of generating consumer suitable 50 Hz sinusoidal alternating voltage without any mechanically wearing and moving parts. So, this facility is characterized as highly reliable and maintenance free, which is especially important for long term Deep Space flights. Experimental modeling mockups are constructed to study aspects and phenomena related to generator liquid metal free surface. An original method for potential electrically conducting liquid free surface electromagnetic stabilization is offered. The work is performed in the Institute of Physics of the University of Latvia and also in the Riga Technical University. Dissertation consists of 4 main paragraphs and it’s volume is 143 pages, that has 188 equations, 98 figures, 4 tables and 2 appendixes. There are references to 97 literature sources.

Magnetohidrodinamika, MHD ģenerators, šķidrs metāls, nātrijs, termoakustika

Brēķis, Artūrs. Magnetohydrodynamic Generator Driven by a Thermoacoustic Engine. PhD Thesis. Rīga: [RTU], 2023. 143 p.

Publication language
Latvian (lv)
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