Experimental Study on Performance of Standing-Wave Thermoacoustic Engine at Different Tilted Angles and Resonator Length

Besides the stack, the parameter can convert the heat energy into sound wave, the other parameters are tilted angles and resonator length which also have to be researched. The aim for the research is to obtain an acoustic intensity greater so that the performance of standing-wave thermoacoustic engine is increased. It is affected by tilted angles because the natural convection will be different every tilted angle within thermoacoustic core while the resonator length will mainly affect the frequency of the thermoacoustic engine. The heat transfer characteristics within it are investigated under 3 tilt angles including, 90 degrees, 0 degrees, and 90 degrees, and also resonator length 390, 780, and 1170 mm. In this study, the acoustic intensity is calculated by the two sensors method. It is found that the pressure amplitude tends to increase with decreasing tilted angles and resonator length. The frequency increases when the resonator length is extended. Nevertheless, it is only has little affected by different tilted angles. Therefore, the acoustic intensity is increased when the tilted angles and resonator length are decreased.