A Computational Fluid Dynamics analysis of the influence of the regenerator on the performance of the cold Stirling engine at different working conditions

Buliński, Zbigniew; Kabaj, Adam; Krysinski, Tomasz; Szczygieł, Ireneusz; Stanek, Wojciech; Rutczyk, Bartłomiej; Czarnowska, Lucyna; Gładysz, Paweł

doi:10.1016/j.enconman.2019.04.089

Cited by 18 publications

(5 citation statements)

References 32 publications

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“…They reported an error of 15.15% in predicting the experimental engine's power output. Several other recent studies, where the thermal modelling of different configurations of Stirling engines using the 3-D CFD approach were implemented, have been reported in the literature [56][57][58][59][60][61]. Although the 3-D CFD analysis provided more insight about the flow fields in the engine, and the distribution of the losses, results obtained from this approach were not significantly better than that of existing second order models.…”

Section: Introductionmentioning

confidence: 94%

A new non-ideal second order thermal model with additional loss effects for simulating beta Stirling engines

Udeh

Michailos

Ingham

et al. 2020

Energy Conversion and Management

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In this paper, comprehensive governing differential equations of Stirling engines have been developed by coupling the effect of gas leakage through the displacer gap, gas leakage into the crank case and the shuttle loss rate into the traditional model. Instantaneous pressures and temperatures of the working fluid in the engine were evaluated at same time step.The present model was deployed for the thermal simulation of the GPU-3 Stirling engine and the obtained results were robustly compared to experimental data as well as results from previous numerical models. Then, parametric studies were conducted to assess the impact of geometrical and operating parameters on the performance of Stirling engines working with helium or hydrogen. Results suggest that the modifications made in this model led to better accuracy and consistency in predicting the experimental data of the prototype engine at all speeds, compared with most previous models. It was found that there exists a minimum dimensionless gap number, for every engine pressure below which mass leakage into the compression volume may not impact the brake power and energetic efficiency of the engine.In addition, an optimum mean effective pressure was found for maximum energetic efficiency of the engine. This optimum value is higher for helium gas than for hydrogen gas. Further results indicated that the brake power and energetic efficiency of the prototype Stirling engine can be significantly improved by 30% and 18%, respectively, provided that the heater temperature is raised to 850 ℃ while the cooler temperature is reduced to 0 ℃.

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Section: Introductionmentioning

confidence: 94%

A new non-ideal second order thermal model with additional loss effects for simulating beta Stirling engines

Udeh

Michailos

Ingham

et al. 2020

Energy Conversion and Management

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“…Results presented in Figure 7 were used to carry out verification of the numerical solution. First of all for three consecutively refined meshes the observed discretisation order was computed (2) [35,36]: f ∆x,i -numerical solution at i-th refinement level, average mesh refinement ratio, Having a value of the observed discretisation order, the Grid Convergence Index (GCI) can be computed, which is interpreted as an estimation of the relative discretisation error (3): f e -exact solution to the problem, E -relative discretisation error, The results of the solution verification procedure are presented in Tab. 3.…”

Section: Grid Sensitivity Studymentioning

confidence: 99%

Numerical Analysis of the Impact of the Use of Personal Protective Equipment on the Face in the Process of Pollutants Spreading Emitted During Breathing

Bulińska

Kocik

Buliński

2023

Architecture, Civil Engineering, Environment

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The study presents the results of a numerical analysis of the effectiveness of the use of personal protective equipment of various designs on the spread of pollutants marked with CO2 emitted during human breathing. In the study of 3D geometry the upper part of the human torso and head was developed. The simulated person was supplied with different personal protective equipment covering the human face (PPE). Two types of face shields worn at a different distance from the face and one fabric face mask was analysed. The reference geometry with no personal protective equipment was also analysed. Transient calculation with full breathing model including breath-in and breath-out and species transport were simulated. The results showed that different PPE generates different airflow patterns in the vicinity of the human face. The most efficient in reducing infection risk is by wearing a face mask or face shields at a small distance from the face, as they most effectively reduce CO2 concentration in the surrounding air. However, they also increase the re-inhalation risk of high CO2 concentration which affects human well-being.

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“…Based on the professional commercial CFD (computational fluid dynamics) analysis software Fluent, the method of numerical simulation technology [6] is adopted to study the influence of grille structure parameters on vehicle wind resistance and engine compartment heat dissipation [7]. The detailed data of the flow field outside the cabin are compared and analyzed.…”

Section: Research Framework Of Active Air Intake Grillementioning

confidence: 99%

Analysis of the Heat Transfer Efficiency of an Automobile Engine under Different Grille Opening and Closing Conditions

Song¹

2022

Fluid Dynamics &Amp; Materials Processing

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Computational Fluid Dynamics is used to assess the thermal (heat transfer) performances of an automobile engine considering different grille opening and closing degrees. For this purpose the entire vehicle is modelled and three fundamental aspects are examined, namely, the open area of the air intake grille, the position of the upper and lower grilles and their shape. The results show that the opening area and position of the grille have some influence also on the aerodynamic characteristics of the automobile. With an increase in the opening angle of the grille, the C D (Drag Coefficient) value of the whole vehicle becomes higher. When the air intake grille of the car is fully open or closed, the C D value is 0.35434 or 0.31777, respectively, that is, the flow resistance in the engine compartment accounts for 10.32% of the C D value for the whole automobile.

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A Computational Fluid Dynamics analysis of the influence of the regenerator on the performance of the cold Stirling engine at different working conditions

Cited by 18 publications

References 32 publications

A new non-ideal second order thermal model with additional loss effects for simulating beta Stirling engines

A new non-ideal second order thermal model with additional loss effects for simulating beta Stirling engines

Numerical Analysis of the Impact of the Use of Personal Protective Equipment on the Face in the Process of Pollutants Spreading Emitted During Breathing

Analysis of the Heat Transfer Efficiency of an Automobile Engine under Different Grille Opening and Closing Conditions

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