AIR FLOW CHARACTERISTICS OF PARACHUTE FABRICS AT SIMULATED HIGH ALTITUDES

The air flow characteristics of parachute canopy cloth were measured over an unusually wide range of test conditions. High altitude simulated tests (up to 150,000 feet) have shown the cloth to have markedly low flow rates, as may be predicted from a nozzle flow analogy. A method of predicting high a...

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Bibliographic Details
Main Authors: SESHADRI, C V, BROWN, G A
Format: Report
Language:English
Subjects:
GAS FLOW
HIGH ALTITUDE
MATHEMATICAL ANALYSIS
PARACHUTE FABRICS
PARACHUTES
STRESSES
Textiles
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Summary:The air flow characteristics of parachute canopy cloth were measured over an unusually wide range of test conditions. High altitude simulated tests (up to 150,000 feet) have shown the cloth to have markedly low flow rates, as may be predicted from a nozzle flow analogy. A method of predicting high altitude behavior was proposed. Permeabilities of four cloths were shown to be significantly dependent on their state of stress AT THE TIME OF AIR FLOW MEASUREMENT. The magnitude of this relationship was observed to be determined by the biaxial stress-strain behavior of each fabric. The air stream deflection tendency of thick canopy material was verified and its cause investigated. The role of pore geometry in influencing cloth permeability was explored. Report for 1 Jul 58-30 Jun 1959 on Air Force textile materials.