Abstract
In this research, a novel hybrid thermodynamic cycle with an asynchronous buffering heat recovery process is proposed to overcome the extremely difficult problem for micro swing engine, i.e. the far too low efficiency. Firstly, the 3-arm micro swing engine is presented, which is proven to hold a better performance than the original 2-arm one. Among the 3 chambers, two are isometric and operate in four-stroke cycle while the rest has a slightly larger volume and works in two-stroke cycle. Then, depending on the reasonable structural design, a novel asynchronous buffering recuperator suitable for the 3-arm structure was designed and the hybrid thermodynamic cycle with heat recovery process was introduced. That is, the gas in the four-stroke chambers recycle all the exhaust heat while the gas in two-stroke ones do not. In the recuperator, the cold flow is intermittent and the heat exchange process is asynchronous. But CFD simulations demonstrate that this buffering recuperation method is effective in settling the problems. Finally, the performance of the hybrid cycle was analyzed. The results indicate that the efficiency of the novel engine reached as high as 11.74%, which was increased by 40.77% in comparison with the one without a recuperator.
Published Version
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