Transient Subsonic Viscous Flow in the Vacuum-Air Propulsion System

A general discussion of the vacuum-air propulsion system and its historic development and a nonsteady analysis of this system, which includes the losses due to viscous friction, inertial and acceleration effects besides other losses is given. This analysis consists in the simultaneous solution of th...

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Bibliographic Details
Main Authors: Rajan,Jai R. N, Kumar,Sudhir
Format: Report
Language:English
Subjects:
EQUATIONS OF MOTION
GUIDED MISSILE LAUNCHERS
Guided Missile Launching and Basing Support
MODEL TESTS
MOUNTAINWELL PROJECT
PASSENGER VEHICLES
PROPULSION SYSTEMS
SKIN FRICTION
SUBSONIC FLOW
Surface Transportation and Equipment
TUBE VEHICLES
VACUUM
VACUUM PROPULSION
VELOCITY
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Summary:A general discussion of the vacuum-air propulsion system and its historic development and a nonsteady analysis of this system, which includes the losses due to viscous friction, inertial and acceleration effects besides other losses is given. This analysis consists in the simultaneous solution of the equation of motion of the projectile and construction of the characteristic net with the aid of a digital computer. A nonsteady isentropic analysis is also developed prior to the viscous flow analysis. Experimental studies were conducted with two models: (1) A 105 ft long, 6 in. I. D. tube with projectiles of weights from 0.62 lb to 11.52 lb; (2) An 85 ft long, 2 in. I.D. tube with projectile weights from 0.033 lb to 1.7 lb. Highest projectile velocities recorded were 1145 ft/sec. Predictions of projectile velocity, entrance flow velocity and pressures behind and ahead of the vehicle made by the nonsteady viscous flow analysis agree well with experimental data. (Author) See also Interim technical rept. no. 6, AD-718 759. Report on Project Mountainwell.