Aeroheating and aerodynamic performance of a transonic hyperloop pod with radial gap and axial channel: A contrastive study

Zhou, Kangyi; Ding, Guofu; Wang, Yueming; Niu, Jiqiang

doi:10.1016/j.jweia.2021.104591

Cited by 27 publications

(7 citation statements)

References 62 publications

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“…However, in the context of the present paper, amongst these proposed solutions, the most interesting one is the proposal of using a compressor [20,21]. It shows that by implementing an air bypass system such as a compressor that crosses the pod, the air passing through the area between the pod and the tube will be reduced, and therefore the velocity of the pod could be increased [22,23]. Moreover, the larger the flow that the compressor is able to handle, the greater the drag reduction.…”

Section: Introductionmentioning

confidence: 88%

“…Moreover, the larger the flow that the compressor is able to handle, the greater the drag reduction. However, within the found literature, the problem of the adaptation of a compressor in the internal aerodynamic system has not been addressed, as these works [20][21][22][23] consider the compressor and the nozzle by means of a simple model in which some mass flow is swallowed at the vehicle front and discharged at its rear part. The current work therefore predicts for the first time the flow field in the compressor and the downstream geometry in the framework of a hyperloop system.…”

Section: Introductionmentioning

confidence: 99%

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Methodology for a Numerical Multidimensional Optimization of a Mixer Coupled to a Compressor for Its Integrationin a Hyperloop Vehicle

et al. 2022

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The current environmental concern has led both the industry and researchers to look for alternate means of transport. Amongst them, the hyperloop has become a quite promising idea. In order to overcome some of its limitations, including a compressor in its propulsive system has been investigated. In this paper, a strategy to improve the design of the mixer, which will blend the bypass and core streams coming out of the compressor, was addressed. Due to the lack of ad hoc compressors and the impossibility of experimental testing, a multidimensional optimization methodology with CFD tools was developed. A Taguchi DOE was employed for a preliminary 2D optimization from an initial geometry, whereas a numerical adjoint method was explored for the whole 3D mixer. By using this method, an initial decrease in the pressure drop of 16% was obtained with the 2D stage, whereas an additional 10% reduction was achieved in the 3D optimization. With this, the propulsive efficiency of the whole hyperloop system will be improved.

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Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Methodology for a Numerical Multidimensional Optimization of a Mixer Coupled to a Compressor for Its Integrationin a Hyperloop Vehicle

et al. 2022

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“…Far-field boundary conditions are applied at the tube ends. Several studies have used this type to eliminate reflections from the boundary Niu [15,16].…”

Section: Boundary Conditionsmentioning

confidence: 99%

Application of Adjoint Aerodynamics Optimization for a High-Speed Vehicle Moving in a Tube

Abdulla,

Alzhrani,

Juhany

et al. 2024

J. Phys.: Conf. Ser.

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This work explores the application of adjoint-based optimization for a self-propelled vehicle moving in a tube at a low-pressure of 10 KPa with a small suspension gap (d) between the vehicle and the tube. The objective is to minimize the drag force for air-ingested vehicles. The thrust was a design constraint to maintain the cruise conditions. The nose and tail parts of the model were parametrized using elliptical approximation. Gradient-based optimization was utilized in the adjoint-based optimization to deform the vehicle’s external shape. The optimization remarkably enhanced the aerodynamic vehicle’s performance by eliminating of shock waves and flow separation observed in the baseline design. As a result, a reduction of ~13% in drag force was achieved. The study shows that adjoint-based optimization provides a robust tool for enhancing the performance of the vehicle-tube system.

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“…The 3-D steady Reynolds Averaged Navier-Stokes (RANS) equations [23] were solved with turbulence modeled using the k-𝜔 Shear Stress Transport (SST) model [24]. The 𝑘 − 𝜔 SST model was used in almost all numerical studies of vehicles in a closed environment [25]- [27]. The second-order upwind scheme is applied to discretize convective terms.…”

Section: Numerical Simulationmentioning

confidence: 99%

“…The blockage ratio is 0.36. The Mach number is defined as the relative flow Mach number [25], [26], [29], [30]. Pressure far-field condition is applied at the upstream and downstream boundaries to avoid reflections.…”

Section: Boundary Conditionsmentioning

confidence: 99%

Effect of Maglev Suspension on the Aerodynamics of Multiple Vehicles Moving in a Low-Pressure Tube

Alzhrani,

Abdulla,

Juhany

et al. 2024

J. Phys.: Conf. Ser.

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The concept of high-speed vehicles traveling in a low-pressure closed system has attracted global attention as an innovative, efficient, and safe mode of transport. So far, most the studies on Hyperloop aerodynamics has considered a single vehicle moving in a confined space, but limited work has been devoted to the succession of vehicles system. This paper deals with the analysis of vehicle suspension gap for multiple vehicles system running in a low-pressure environment. The vehicle’s system is traveling at Mach number = 0.7 in a low operating pressure of 10,000 Pa and blockage ratio of 0.36. Each vehicle is equipped with a compressor and jet exit to provide the thrust force. Three running vehicles at various vehicle-to-vehicle distances, Xv (0.25, 0.5, 1, 2Lv), were numerically investigated using RANS. The analysis was carried out at a gap distance of 75 mm. The obtained results showed that the suspension gap significantly impacts the aerodynamic performance of the entire system. The flow structure behind each vehicle was investigated, and its influence on thrust was presented. It was observed that the drag on the trailing vehicle is approximately six times the drag on the leading vehicle. The high drag on the trailing vehicle is attributed to the development of shock waves at its rear part.

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Aeroheating and aerodynamic performance of a transonic hyperloop pod with radial gap and axial channel: A contrastive study

Cited by 27 publications

References 62 publications

Methodology for a Numerical Multidimensional Optimization of a Mixer Coupled to a Compressor for Its Integrationin a Hyperloop Vehicle

Methodology for a Numerical Multidimensional Optimization of a Mixer Coupled to a Compressor for Its Integrationin a Hyperloop Vehicle

Application of Adjoint Aerodynamics Optimization for a High-Speed Vehicle Moving in a Tube

Effect of Maglev Suspension on the Aerodynamics of Multiple Vehicles Moving in a Low-Pressure Tube

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