Acoustic characteristics of bi-directional turbines for thermoacoustic generators

doi:10.1007/s11708-020-0702-3

Front. Energy

2022, Vol. 16

Issue (6) : 1027-1036 https://doi.org/10.1007/s11708-020-0702-3

RESEARCH ARTICLE

Acoustic characteristics of bi-directional turbines for thermoacoustic generators

Dongdong LIU¹(

), Yanyan CHEN²(

), Wei DAI², Ercang LUO²

¹. University of Chinese Academy of Sciences, Beijing 101408, China; Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
². Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China

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Abstract

Bi-directional turbines combined with rotary motors may be a feasible option for developing high power thermoacoustic generators with low cost. A general expression for the acoustic characteristics of the bi-directional turbine was proposed based on theoretical derivation, which was validated by computational fluid dynamics modeling of an impulse turbine with fixed guide vanes. The structure of the turbine was optimized primarily using steady flow with an efficiency of near 70% (the shaft power divided by the total energy consumed by the turbine). The turbine in the oscillating flow was treated in a lumped-parameter model to extract the acoustic impedance characteristics from the simulation results. The key acoustic impedance characteristic of the turbine was the resistance and inertance due to complex flow condition in the turbine, whereas the capacitance was treated as an adiabatic case because of the large-scale flow channel relative to the heat penetration depth. Correlations for the impedance were obtained from both theoretical predictions and numerical fittings. The good fit of the correlations shows that these characteristics are valid for describing the bi-directional turbine, providing the basis for optimization of the coupling between the thermoacoustic engine and the turbine using quasi-one-dimensional theory in the frequency domain.

Keywords thermoacoustic power generator acoustic characteristics bi-directional impulse turbine energy conversion

Corresponding Author(s): Dongdong LIU,Yanyan CHEN

Online First Date: 21 October 2020 Issue Date: 17 January 2023

Cite this article:

Dongdong LIU,Yanyan CHEN,Wei DAI, et al. Acoustic characteristics of bi-directional turbines for thermoacoustic generators[J]. Front. Energy, 2022, 16(6): 1027-1036.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-020-0702-3
https://academic.hep.com.cn/fie/EN/Y2022/V16/I6/1027

Fig.1 Axial-flow impulse bi-directional turbine.

Fig.2 2D CFD model of the impulse turbine with fixed guide vanes.

Fig.3 Velocity and pressure for a single cycle of the incoming flow oscillation.

Fig.4 Impulse bi-directional turbine performance.

Fig.5 Flow friction for the turbine in steady flow.

Fig.6 Inertia of turbine.

Fig.7 Verification of nondimensional inertia expression (Eq. (14)).

Fig.8 Nondimensional resistance of turbine.

Fig.9 Verification of the nondimensional resistance expression (Eq. (13)).

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