A novel non-linear one-dimensional unsteady model for thermoacoustic engine and its application on a looped traveling-wave thermoacoustic engine

Sun, Dan; Luo, Kai; Zhang, Jie; Yang, Yu; Pan, Honghao

doi:10.1016/j.apacoust.2021.108136

Cited by 7 publications

(3 citation statements)

References 34 publications

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“…Sun et al [42] developed a nonlinear mathematical model of NSEs solved with the finite difference method for a three-stage traveling-wave engine. Different steady-state correlations of the friction factor and Nusselt number were used for the pipe (fully turbulent), regenerator (from the classical Stirling engine literature) and heat exchangers (rectangular channel).…”

Section: Lumped and 1d Time-domain Modelsmentioning

confidence: 99%

CFD Modeling of Thermoacoustic Energy Conversion: A Review

Meglio

Massarotti

2022

Energies

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In this article, a comprehensive review of the computational fluid dynamics (CFD)-based modeling approach for thermoacoustic energy conversion devices is proposed. Although thermoacoustic phenomena were discovered two centuries ago, only in recent decades have such thermoacoustic devices been spreading for energy conversion. The limited understanding of thermoacoustic nonlinearities is one of the reasons limiting their diffusion. CFD is a powerful tool that allows taking into consideration all the nonlinear phenomena neglected by linear theory, on which standard designs are based, to develop energy devices that are increasingly efficient. Starting from a description of all possible numerical models to highlight the difference from a full CFD method, the nonlinearities (dynamic, fluid dynamic and acoustic) are discussed from a physical and modeling point of view. The articles found in the literature were analyzed according to their setup, with either a single thermoacoustic core (TAC) or a full device. With regard to the full devices, a further distinction was made between those models solved at the microscopic scale and those involving a macroscopic porous media approach to model the thermoacoustic core. This review shows that there is no nonlinear porous media model that can be applied to the stack, regenerator and heat exchangers of all thermoacoustic devices in oscillating flows for each frequency, and that the eventual choice of turbulence model requires further studies.

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Section: Lumped and 1d Time-domain Modelsmentioning

confidence: 99%

CFD Modeling of Thermoacoustic Energy Conversion: A Review

Meglio

Massarotti

2022

Energies

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“…Researchers have explored various computational fluid dynamics (CFD) approaches to model thermoacoustic systems. This includes two-dimensional simulations of various travelling wave systems using commercial software [14,15,16], and onedimensional simulations [17]. However, reliable validation of the thermoacoustic system design still has to be carried out using experiments, as one-dimensional systems lack the necessary detail to capture the fluid mechanical losses of variable device geometries.…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of a looped travelling wave thermoacoustic engine

Cho,

Xu,

Hochgreb

2024

Preprint

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This article presents a two-dimensional axissymmetric computational fluid dynamics (CFD) simulation of a three-stage travelling wave thermoacoustic engine using ANSYS FLUENT. The model incorporates porous media submodels to represent heat exchangers and regenerators, operating at a heating temperature of 600 K and an ambient temperature of 293 K, with helium as the working fluid stabilised around 3 MPa mean pressure. In comparison to traditional network models (NM), CFD yields accurate results in solving the flow field and captures higher-order details in the fluid domain.

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“…In analysis six monitoring points are considered to analyze generation and transmission of acoustic wave. Daming Sun et al (2021) have investigate the working mechanism of thermoacoustic engine with the unsteady onset process as the primary focus using a unique nonlinear one dimensional unsteady model. The computational results showed that the acoustic oscillations in the transient onset process is greatly enhanced by thermal conduction.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of looped tube thermoacoustic power generator using cyclic analysis

Gaikwad,

Shinde,

Naidu

et al. 2024

Front. Mech. Eng.

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This paper focuses on the numerical and experimental investigation of the small-scale power generator. The travelling wave thermoacoustic power generator is numerically analyzed and experimentally tested. The cyclic analysis is used to carry out numerical analysis of the power generator. The system is operated on atmospheric pressure, which allows the manufacturing of an acoustic feedback loop using Polyvinyl chloride piping. The acoustic power generated inside the generator is harnessed by the low-cost linear alternator, i.e., loudspeaker. The effect of regenerator wire mesh on performance of the power generator is numerically analyzed and validated experimentally. The numerical analysis identifies the temperature variation, pressure fluctuation, volume flow rate inside the system, and acoustic power distribution. The maximum electric power experimentally generated by the small-scale power generator is around 45 W with overall efficiency 8.30%. The alternator generates the maximum electric power at the optimum location, i.e. 2.30 m away from the engine core.

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A novel non-linear one-dimensional unsteady model for thermoacoustic engine and its application on a looped traveling-wave thermoacoustic engine

Cited by 7 publications

References 34 publications

CFD Modeling of Thermoacoustic Energy Conversion: A Review

CFD Modeling of Thermoacoustic Energy Conversion: A Review

Numerical modelling of a looped travelling wave thermoacoustic engine

Performance evaluation of looped tube thermoacoustic power generator using cyclic analysis

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