Experiment Study On Characteristics Of Thermally Driven Thermoacoustic Engine

Thermoacoustic engine is a new type of engine which is based on the thermoacoustic effect, with no pollution, no moving parts, and high reliability. Based on previous work and the research of thermoacoustic engine, the study on fundamental theory, prototype manufacture and experimental research were carried out:1) According to the linear thermoacoustic theory, this article analyzed the impact of the rmoacoustic engine, and introduced structure wave, also proposed structure of sound produced by two main mechanisms, with vibration exciting and acoustic excitation;2) The structure of flat-plate regenerator in thermoacoustic engine was calculated while considered gas channel in regenerator as a rectangular ducting. Based on the derivation of waveguide theory, the structure of regenerator of the microminiaturize thermoacoustic engine was investigated. For the 50 KHz thermoacoustic engine, the maximum transverse size of regenerator in thermoacoustic engine is obtained; for the acoustic source with three kinds of frequency, the portrait length of the plates is calculated utilizing attenuation principle of higher-order mode wave; the regenerator network model utilizing fluid network theory, the impact of stack-type heat exchanger was set up plate spacing and heat recovery location of the acoustic device to calculate flow resistance;3) Based on the previous work, through re-designed and improved the experimental prototype, a standing wave thermoacoustic engine was established. When the pressure were 0.4 MPa,0.5 MPa,0.6 MPa,0.7 MPa and 0.8MPa, the experimental study of thermoacoustic engine in the heating power of 400W was carried out, and the changes of the frequency and amplitude were obtained. When the heating power was 1000W, sound wave of a frequency of 126Hz and amplitude 72000Pa was achieved under the pressure of 0.7MPa;4) The inadequacy of traditional heat exchanger applied in thermoacoustic energy for utilizing waste heat was analyzed, and heat exchanger made of honeycomb ceramic material was raised. Experiment proved the great thermal storage ability of honeycomb ceramic material. KEY WPRD:thermoacoustic engine, rectangular ducting, stand wave,...