NTRS - NASA Technical Reports Server

Back to Results
Model of ASTM Flammability Test in Microgravity: Iron RodsThere is extensive qualitative results from burning metallic materials in a NASA/ASTM flammability test system in normal gravity. However, this data was shown to be inconclusive for applications involving oxygen-enriched atmospheres under microgravity conditions by conducting tests using the 2.2-second Lewis Research Center (LeRC) Drop Tower. Data from neither type of test has been reduced to fundamental kinetic and dynamic systems parameters. This paper reports the initial model analysis for burning iron rods under microgravity conditions using data obtained at the LERC tower and modeling the burning system after ignition. Under the conditions of the test the burning mass regresses up the rod to be detached upon deceleration at the end of the drop. The model describes the burning system as a semi-batch, well-mixed reactor with product accumulation only. This model is consistent with the 2.0-second duration of the test. Transient temperature and pressure measurements are made on the chamber volume. The rod solid-liquid interface melting rate is obtained from film records. The model consists of a set of 17 non-linear, first-order differential equations which are solved using MATLAB. This analysis confirms that a first-order rate, in oxygen concentration, is consistent for the iron-oxygen kinetic reaction. An apparent activation energy of 246.8 kJ/mol is consistent for this model.
Document ID
Document Type
Conference Paper
Steinberg, Theodore A (Queensland Univ. Brisbane, Australia)
Stoltzfus, Joel M. (NASA White Sands Test Facility NM United States)
Fries, Joseph
Date Acquired
August 19, 2013
Publication Date
January 1, 2000
Subject Category
Inorganic, Organic and Physical Chemistry
Meeting Information
9th International Symposium on Flammability and Sensitivity of Materials(Paris)
Funding Number(s)
Distribution Limits
Work of the US Gov. Public Use Permitted.