Abstract
In order to build a thermo acoustic engine of high efficiency, the structure of the device needs to be decided so that it enables efficient energy exchange, by accurate calculation of the distribution of acoustic impedance, while the engine is in an excited state, and by feeding back the information. In this report we aim to derive critical point and distibution of acoustic impedance theoretically by applying thermo acoustic theory, and we also aim to achieve the realization of low-temperature excite by controlling distribution of acoustic impedance using a expended pipe. The theoretically calculated result shows approximately consistency with the actual experimental result, therefore confirming the validity of our method. Also, it is learned that exciting temperature can be largely reduced by installing the expended pipe right before the stack.
