A 1D model for the unsteady gas dynamics of ejectors

Berghe, Jan Van den; Dias, Bruno; Bartosiewicz, Yann; Mendez, Miguel A.

doi:10.1016/j.energy.2022.126551

Cited by 5 publications

(4 citation statements)

References 34 publications

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“…Energies 2023, 16, 6196 2 of 16 Van den Berghe et al [8] developed a new 1D transient model for ejectors based on a pipeline analogy for gas-dynamic calculations. This model was based on the non-stationary Euler's equation.…”

Section: Introductionmentioning

confidence: 99%

An Increase in the Energy Efficiency of Abrasive Jet Equipment Based on the Rational Choice of Nozzle Geometry

Baha,

Mižáková,

Pavlenko

2023

Energies

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Permanently increasing requirements for the accuracy of abrasive jet machining (AJM) predetermine a need to increase requirements for the rational choice of the related energy-efficient technological equipment. Due to the relatively cheap and high-quality cleaning of materials from contaminants using AJM, the problem of increasing the energy efficiency of the corresponding equipment based on the rational choice of nozzle geometry becomes more topical. This is also because the working nozzle is a consumable part that requires periodic replacements. Therefore, this article deals with rational designing working nozzles as a reliable way to decrease the power consumption of the compressor equipment while engaging in AJM. For this purpose, experimental and numerical studies of the operating processes in the nozzle were carried out. The main idea of increasing the nozzle’s efficiency was to reduce the contact area between the working flow and the nozzle. Due to this, the friction of the abrasive material with its walls was decreased. As a result, the AJM was accelerated, and the energy consumption of the corresponding compressor equipment was reduced. The research showed that a decrease in the nozzle’s length up to 4 mm increased the flow ratio by 84% and decreased the energy consumption of the 40 kW compressor unit by 4.5 times.

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Section: Introductionmentioning

confidence: 99%

An Increase in the Energy Efficiency of Abrasive Jet Equipment Based on the Rational Choice of Nozzle Geometry

Baha,

Mižáková,

Pavlenko

2023

Energies

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“…A compromise consists of 1D models, which discretize the flow field in the axial direction. The mixing pipe can be modelled with a single domain [9], or with two interacting domains [10][11][12]. These models still require calibration, for example, for modelling wall friction and shear.…”

Section: Introductionmentioning

confidence: 99%

A Machine Learning-Based Calibration of a 1D Ejector Model from CFD

Berghe

Vemula

Bartosiewicz

et al. 2023

36th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 20

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Ejectors are devices that expand a primary flow through a nozzle to entrain and compress a secondary flow without moving parts. They can be modelled in 1D as two streams exchanging momentum. However, the engineering modelling of this exchange is based on closure parameters such as friction coefficients that must be calibrated against experimental or numerical data. This work proposes a general machine learning framework for calibrating engineering models governed by Ordinary Differential Equations (ODEs) and presents its application to the 1D modelling of an ejector. We combine a physics-separated approach with a physicsintegrated approach, with the first acting as an initial guess for the second. The first approach calibrates shear and friction coefficients from their counterpart extracted via post-processing of an axisymmetric CFD simulation. The second consists of calibrating these coefficients from the prediction of physical quantities (pressures, temperatures, and cross-sections), thus making the training process aware of the ODEs driving the forecast.

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“…Currently, a unified theory that generalizes the results of studying the processes in flows formed by ejectors is still being developed. Therefore, attempts are being made to study these processes using modern numerical analysis tools, mainly to optimize the structural parameters of ejectors and achieve the highest entrainment ratio [14][15][16][17][18][19][20][21][22][23][24][25]. In [14,15], the authors proposed Huang's model and Chen's model.…”

Section: Introductionmentioning

confidence: 99%

“…Further, a regression model was suggested that combines the operating and geometric parameters involving the entrainment ratio. In [19], a 1D unsteady model was proposed for supersonic single-phase ejectors based on a pipeline analogy having two inlets and one outlet. A characteristic-based junction model combined 1D gas-dynamic equations across computational domains.…”

Section: Introductionmentioning

confidence: 99%

Efficiency Optimization of an Annular-Nozzle Air Ejector under the Influence of Structural and Operating Parameters

Lysak

Konyukhov

et al. 2023

Mathematics

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The efficiency of annular-nozzle ejectors serving as components of complex technical systems interacting with high-temperature media in engines and in the field of energy technologies is not linearly related to the gas-dynamic characteristics of the flows formed in the device. In this paper, we have analyzed the results of numerical and experimental studies of gas jets in an annular-nozzle air ejector. The regression equations built according to the circumscribed central composite design described the relationship between a pressure drop and the structural parameters of the nozzle with the speed and mass flow rates of the airflows, including error rates of no more than 15 percent. A two-factor optimization based on Harington’s generalized desirability function was performed to obtain a relatively accurate estimate of the ejector efficiency under the influence of the structural and operating parameters. An optimization method based on the combination of response surface methodology and the desirability function approach, allowing simultaneous consideration of all responses, made it possible to simultaneously optimize multiple conflicting objectives.

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A 1D model for the unsteady gas dynamics of ejectors

Cited by 5 publications

References 34 publications

An Increase in the Energy Efficiency of Abrasive Jet Equipment Based on the Rational Choice of Nozzle Geometry

An Increase in the Energy Efficiency of Abrasive Jet Equipment Based on the Rational Choice of Nozzle Geometry

A Machine Learning-Based Calibration of a 1D Ejector Model from CFD

Efficiency Optimization of an Annular-Nozzle Air Ejector under the Influence of Structural and Operating Parameters

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