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Study of thermoacoustic engine for automotive exhaust waste heat recovery
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0001-7898-8643
2019 (English)In: SAE technical paper series, ISSN 0148-7191, Vol. 2019-April, no AprilArticle in journal (Refereed) Published
Abstract [en]

In this paper, the travelling-wave thermoacoustic engine (TAE) and its application for recovery of waste heat from automotive exhaust systems is investigated. The aim is to give some insight into the potential, but also limitations of the technique for practical applications. This includes packaging, physical boundary conditions as heating and cooling available, but also system perspectives as influence of legislative drive cycles and degree of hybridization. First, the travelling-wave TAE is described as a low-order acoustic network in the frequency domain. Models, including non-linear effects, are set up for every component in the network to describe the propagation and dissipation of acoustic waves. For a TAE with looped structure, the continuity of pressure and volumetric velocity is employed to determine the saturation pressure, as well as the stable operating point. These models are validated against experimental data available in the literature [1]. This is an engine designed for high-temperature application, but is well documented and yields a good reference for the models and to further the understanding of the TAE. Next, an optimized design for a system to be adapted to the operating conditions typical for heavy-duty systems is studied and proposed. No actual physical prototype has been built and verified, but the design is based on, and is of the same efficiency, as machines that have been reported in the literature. The proposed design and the original TAE are then used to discuss the practical implementation for heavy- and light-duty vehicles on a system level. To improve the utilization of the available exhaust waste heat, a configuration of system heat exchangers combining a self-circulating loop with multiple TAE modules is preliminarily studied. Further research for this configuration is needed for practical implementation although current simulation results are encouraging.

Place, publisher, year, edition, pages
SAE International , 2019. Vol. 2019-April, no April
Keywords [en]
Acoustic wave propagation, Computer system recovery, Digital storage, Frequency domain analysis, High temperature applications, Thermoacoustic engines, Thermoacoustics, Waste heat, Waste heat utilization, Wave transmission, Automotive exhaust, Automotive exhaust system, Current simulation, Degree of hybridization, Heating and cooling, Light duty vehicles, Operating condition, Saturation pressure, Exhaust systems (engine)
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-255938DOI: 10.4271/2019-01-1257Scopus ID: 2-s2.0-85064680284OAI: oai:DiVA.org:kth-255938DiVA, id: diva2:1343377
Conference
9 April 2019 through 11 April 2019
Note

QC 20190816

Available from: 2019-08-16 Created: 2019-08-16 Last updated: 2019-08-16Bibliographically approved

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Karlsson, MikaelÅbom, Mats

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