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Feldman mentioned in his related review that a convective air current through the pipe is the main inducer of this phenomenon. [8] The oscillations are strongest when the screen is at one fourth of the tube length. Research performed by Sondhauss in 1850 is known to be the first to approximate the modern concept of thermoacoustic oscillation.
The most efficient thermoacoustic devices have an efficiency approaching 40% of the Carnot limit, or about 20% to 30% overall (depending on the heat engine temperatures). [11] Higher hot-end temperatures may be possible with thermoacoustic devices because they have no moving parts, thus allowing the Carnot efficiency to be higher. This may ...
Diagram of an RTG used on the Cassini probe. A radioisotope thermoelectric generator (RTG, RITEG), sometimes referred to as a radioisotope power system (RPS), is a type of nuclear battery that uses an array of thermocouples to convert the heat released by the decay of a suitable radioactive material into electricity by the Seebeck effect.
Philips MP1002CA Stirling generator of 1951. During the early part of the 20th century, the role of the Stirling engine as a "domestic motor" [32] was gradually taken over by electric motors and small internal combustion engines. By the late 1930s, it was largely forgotten, only produced for toys and a few small ventilating fans. [33]
NASA patented a type of solar-powered Stirling engine on August 3, 1976. It used solar energy to pump water from a river, lake, or stream. [1] The purpose of this apparatus is to “provide a low-cost, low-technology pump having particular utility in irrigation systems employed in underdeveloped arid regions of the earth…[using] the basic principles of the Stirling heat engine“.
1962 – Nikolaus Rott reopened the topic.of thermoacoustic engines described by Lord Rayleigh in 1887 and produced a full theoretical analysis which led to technological development and a working device carried on the Space Shuttle in 1992. 1992 – The first practical magnetohydrodynamic generators are built in Serbia and the USA.
This concept can be more conceivable by imagining it in analogy to laser theory. Theodore Maiman operated the first functioning LASER on May 16, 1960 at Hughes Research Laboratories, Malibu, California, [6] A device that operates according to the central idea of the "sound amplification by stimulated emission of radiation" theory is the thermoacoustic laser.
In 2005, when TAI was initiated, P&W, following standard NDT industry practice, categorized the TAI as a new and emerging technology that allowed TAI to be performed without establishing a formal training program and certification requirements.
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