CFD modelling of the effect of oscillating jets on streaming heat losses in a torus-shaped thermoacoustic engine

Nijeholt, J.A. Lycklama à; Tijani, Michel; Siccama, N.B.

doi:10.3990/2.297

Cited by 2 publications

(4 citation statements)

References 1 publication

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“…Scalo et al also [69] carried out 3D high-fidelity numerical simulations of the same traveling-wave engine and calculated its overall efficiency. Lycklama à Nijeholt et al [84] later realized a 2D and 3D torus-shaped traveling-wave engine closer to reality compared to the previous model, whose geometry cannot be constructed practically. Furthermore, they introduced an "asymmetric factor" to remove the Gedeon streaming and a purely inertial resistance in a specific porous zone of the resonator to simulate the acoustic load.…”

Section: Microscopic Modelsmentioning

confidence: 93%

“…Lyklama a Nijeholt [84] introduced a "directionality factor" in the regenerator porous zone to model a membrane used to block the DC flow in the experimental setup of a thermoacoustic engine. This additional viscous resistance, when the working fluid moves from the cold to the hot heat exchanger, was tuned to obtain a net-zero mass flow rate.…”

Section: Minor Lossesmentioning

confidence: 99%

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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: Microscopic Modelsmentioning

confidence: 93%

Section: Minor Lossesmentioning

confidence: 99%

CFD Modeling of Thermoacoustic Energy Conversion: A Review

Meglio

Massarotti

2022

Energies

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“…Besides the simulations of the thermoacoustic couple, simulations of entire engines have also been performed. Lycklama à Nijeholt et al performed simulation of a coaxial traveling wave thermoacoustic engine with ANSYS CFX [41], from which they concluded that CFD can be used for the prediction and optimization of thermoacoustic devices, as the agreement between the simulations and the experiments was satisfactory [42]. In their work they did not geometrically resolve the heat exchanger and the regenerator, but modeled it with help of volume sources in order to reduce the computational resources need.…”

Section: Cfd Modeling In Thermoacousticsmentioning

confidence: 99%

“…Simulations of traveling wave engines in a configuration like Backhaus and Swift [14] proposed are rare. Lycklama à Nijeholt et al [42] conducted CFD simulations of an entire engine, but the numerical mesh used does not fulfill the requirements derived in Chapter 4.1. For this reason the general validity of the results are suspect.…”

Section: Thermal Buffer Tubementioning

confidence: 99%

Towards numerical simulation of components of thermoacoustic devices with commercial CFD software : implementation of impedance boundary conditions and application to four different studies

Bühler¹

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Uit de vier in het kader van dit proefschrift verrichte onderzoeken kan worden geconcludeerd dat het simuleren van componenten van thermoakoestische apparaten met commerciële CFD mogelijk is en dat dit kan bijdragen aan een beter begrip van de stromingsverschijnselen binnen de desbetreffende componenten. Dit onderzoek maakt de weg vrij voor verder onderzoek naar overige thermoakoestische componenten met behulp van CFD. Contents v Contents SUMMARY .

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CFD modelling of the effect of oscillating jets on streaming heat losses in a torus-shaped thermoacoustic engine

Cited by 2 publications

References 1 publication

CFD Modeling of Thermoacoustic Energy Conversion: A Review

CFD Modeling of Thermoacoustic Energy Conversion: A Review

Towards numerical simulation of components of thermoacoustic devices with commercial CFD software : implementation of impedance boundary conditions and application to four different studies

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