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Title: Aerodynamics of electrically driven freight pipeline system

Abstract

This paper examines the aerodynamic characteristics of a freight pipeline system in which freight capsules are individually propelled by electrical motors. The fundamental difference between this system and the more extensively studied pneumatic capsule pipeline is the different role played by aerodynamic forces. In a driven system the propelled capsules are resisted by aerodynamic forces and, in reaction, pump air through the tube. In contrast, in a pneumatically propelled system external blowers pump air through the tubes, and this provides the thrust for the capsules. An incompressible transient analysis is developed to study the aerodynamics of multiple capsules in a cross-linked two-bore pipeline. An aerodynamic friction coefficient is used as a cost parameter to compare the effects of capsule blockage and headway and to assess the merits of adits and vents. The authors conclude that optimum efficiency for off-design operation is obtained with long platoons of capsules in vented or adit connected tubes.

Authors:
;
Publication Date:
Research Org.:
Univ. of Minnesota, Minneapolis, MN (US)
OSTI Identifier:
20080359
Alternate Identifier(s):
OSTI ID: 20080359
Resource Type:
Journal Article
Journal Name:
Journal of Transportation Engineering
Additional Journal Information:
Journal Volume: 126; Journal Issue: 3; Other Information: PBD: May-Jun 2000; Journal ID: ISSN 0733-947X
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 42 ENGINEERING; PIPELINES; CARGO; LAND TRANSPORT; ELECTRIC-POWERED VEHICLES; ELECTRIC MOTORS; AERODYNAMICS; ENERGY EFFICIENCY; SAFETY

Citation Formats

Lundgren, T.S., and Zhao, Y. Aerodynamics of electrically driven freight pipeline system. United States: N. p., 2000. Web. doi:10.1061/(ASCE)0733-947X(2000)126:3(263).
Lundgren, T.S., & Zhao, Y. Aerodynamics of electrically driven freight pipeline system. United States. doi:10.1061/(ASCE)0733-947X(2000)126:3(263).
Lundgren, T.S., and Zhao, Y. Thu . "Aerodynamics of electrically driven freight pipeline system". United States. doi:10.1061/(ASCE)0733-947X(2000)126:3(263).
@article{osti_20080359,
title = {Aerodynamics of electrically driven freight pipeline system},
author = {Lundgren, T.S. and Zhao, Y.},
abstractNote = {This paper examines the aerodynamic characteristics of a freight pipeline system in which freight capsules are individually propelled by electrical motors. The fundamental difference between this system and the more extensively studied pneumatic capsule pipeline is the different role played by aerodynamic forces. In a driven system the propelled capsules are resisted by aerodynamic forces and, in reaction, pump air through the tube. In contrast, in a pneumatically propelled system external blowers pump air through the tubes, and this provides the thrust for the capsules. An incompressible transient analysis is developed to study the aerodynamics of multiple capsules in a cross-linked two-bore pipeline. An aerodynamic friction coefficient is used as a cost parameter to compare the effects of capsule blockage and headway and to assess the merits of adits and vents. The authors conclude that optimum efficiency for off-design operation is obtained with long platoons of capsules in vented or adit connected tubes.},
doi = {10.1061/(ASCE)0733-947X(2000)126:3(263)},
journal = {Journal of Transportation Engineering},
issn = {0733-947X},
number = 3,
volume = 126,
place = {United States},
year = {2000},
month = {6}
}