Affecting factors and numerical value calculation relating to vacuumizing time in Evacuated Tube Transportation

Zhang, Yaoping; Yu, Jianyue; Shen, Maoxing; Oster, Daryl; Chen, Chen

doi:10.1109/ifost.2011.6021014

Cited by 3 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, in the 1970s and the 1980s, United States researchers developed and refined the concepts of the ETT-Maglev transport like "Planetran", "StarTram", and "ET3" (Mossi and Sibilla, 2002;Jufer et al, 2006). Limited by the development of maglev technology at that time, the ETT-Maglev researches were mainly in the stage of theoretical research, and there were no substantial test lines in the world (Oster et al, 2011;Zhang et al, 2011;Jiang et al, 2012). In June 2014, the HTS Maglev research team in Southwest Jiaotong University successfully developed an evacuated tube HTS Maglev test platform "Super-Maglev" (Deng et al, 2017), as shown in Figure 1, which strongly demonstrates the feasibility and potential merits of the ETT-HTS Maglev transportation concept.…”

Section: Introductionmentioning

confidence: 97%

Aerodynamic load analyses of less-emission HTS maglev train in evacuated tube transport system

et al. 2023

View full text Add to dashboard Cite

An evacuated tube transport (ETT) system is proposed by combining evacuated tube technology and high temperature superconducting (HTS) maglev technology in this paper. It can be predicted that this future transport mode can own the advantages of less emission, low noise, high efficiency, and suitable for high-speed or super-high-speed application. The train running at a high speed will inevitably cause complex aerodynamic load behaviors in an enclosed low-pressure tube. It further affects the real energy consumption and the fatigue life of the components. In order to explore how the aerodynamic load behaves in an ETT-HTS Maglev system, we established a three-dimension numerical calculation model based on ANSYS FLUENT software. The steady aerodynamic loads on the train’s surface and the tube’s inner surface are investigated under different pressures and different operation speeds. It is found that the aerodynamic load on the surface of the train and tube is significantly affected by the pressure inside the tube and the running speed of the train. The aerodynamic load fluctuations at the rear of the train are relatively more violent than those at the head. We also found that the impact of compression wave and expansion wave on aerodynamic loads at different positions of the tube is related to the size of the flow field space between the tube and the train. These results can provide some reference for the less-emission train body design and the whole ETT-HTS Maglev system structural strength in the near future.

show abstract

Section: Introductionmentioning

confidence: 97%

Aerodynamic load analyses of less-emission HTS maglev train in evacuated tube transport system

et al. 2023

View full text Add to dashboard Cite

show abstract

“…It badly increases the launch cost and decreases the launch efficiency, furthermore restricting the course for probing and exploiting the space. In order to solving these problems in space launch, it is prospective to construct the evacuated tube, pump out air from the tube [1][2][3][4][5], have the maglev loaded with the spacecraft run in it, accelerate the maglev up to a high speed over 3km/s, even 7km/s, then have the spacecraft fly out the tube at the end. Because the spacecraft has reached a high speed on ground, the first class of rocket could be saved.…”

Section: Introductionmentioning

confidence: 99%

Route Length, Curve Radius and Layout of Evacuated Tube Maglev Space Launch System

Zhang

2013

AMM

View full text Add to dashboard Cite

Current space launch is expensive and low-efficient because the invalid load----rocket and fuel in it occupies over 80% of the total launch weight. A solution to reduce the space launch cost and increase the launch efficiency is to construct the evacuated tube, pump air out from the tube and have the maglev vehicle loaded with the spacecraft run in it; the spacecraft fly out the tube when the maglev is accelerated to ultra-speed, e.g. 5km/s even 8km/s in the tube. By this way, the first class of the rocket could be saved, so that the launch cost would be low and lead the large scale space exploitation to become reality in the soon future. As for the tube construction, the route layout should be concerned on at first. Because of the engineering restriction, the height at the tube end wouldnt be very high, and the embedding depth wouldnt be very deep, practically about 8km. However, the tube length will be 700km at least, a completely straight tube or a completely curve tube (on a single circle) would lead a too small launch angle. Thus both of them are not feasible. Reasonable tube routes in vertical section will include two or more than two segments, for example, a straight tube segment and a curve tube segment, or two or more than two curve segments in different radius or different curve direction.

show abstract

High-speed vacuum pipeline pumping system power consumption estimation

Kalinkin

Belova

Nesterov

et al. 2020

International Conference on Science and Applied Science (Icsas2020)

View full text Add to dashboard Cite

Affecting factors and numerical value calculation relating to vacuumizing time in Evacuated Tube Transportation

Cited by 3 publications

References 0 publications

Aerodynamic load analyses of less-emission HTS maglev train in evacuated tube transport system

Aerodynamic load analyses of less-emission HTS maglev train in evacuated tube transport system

Route Length, Curve Radius and Layout of Evacuated Tube Maglev Space Launch System

High-speed vacuum pipeline pumping system power consumption estimation

Contact Info

Product

Resources

About