High-frequency thermoacoustic engines
Abstract/Contents
- Abstract
- Thermoacoustic engines are devices capable of converting external heat sources into acoustic power, which in turn can be converted to mechanical or electrical power. Thermoacoustic engines typically operate at frequencies of 100 Hz or lower; however, power density scaling suggests that arrays of smaller, high-frequency engines can be an attractive heat engine technology. This work presents several advances towards the design and optimization of high-frequency thermoacoustic engines. A 400 Hz piezoelectric-thermoacoustic engine is comprehensively modeled using Navier-Stokes and linear acoustics codes, with results in good agreement with experimental data. A piezoelectric diaphragm allows the complete thermoacoustic engine system to convert energy with no moving parts. A model for bulk viscosity is presented, and values from the model allow both Navier-Stokes and lattice Boltzmann solvers to accurately capture acoustic attenuation due to molecular relaxation effects across a broad range of frequencies. Molecular relaxation effects are the dominant attenuation source at higher frequencies; it is shown that relaxation has reduced effect in the thermoacoustic cycle, but can affect attenuation in other acoustic components. The geometry of a 25 kHz engine is presented, and optimization of the engine for geometry, pressure, bulk viscosity attenuation, and thermoacoustic core construction is performed using a combined Navier-Stokes and linear thermoacoustics framework. A 3D printed 3 kHz thermoacoustic engine is designed and constructed, with corresponding experimental results.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2017 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Lin, Jeffrey |
|---|---|
| Associated with | Stanford University, Department of Electrical Engineering. |
| Primary advisor | Hesselink, Lambertus |
| Thesis advisor | Hesselink, Lambertus |
| Thesis advisor | Khuri-Yakub, Butrus T, 1948- |
| Thesis advisor | Lele, Sanjiva K. (Sanjiva Keshava), 1958- |
| Advisor | Khuri-Yakub, Butrus T, 1948- |
| Advisor | Lele, Sanjiva K. (Sanjiva Keshava), 1958- |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Jeffrey Lin. |
|---|---|
| Note | Submitted to the Department of Electrical Engineering. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2017. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2017 by Jeffrey Lin
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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