Application of Thermochemical Modeling to Aircraft Interior Polymeric Materials. II. Multilayered Seat.
Final rept. Jun 81-May 82,
JET PROPULSION LAB PASADENA CA
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The use of fire-blocking layers between the foam cushion and the covering fabric has been studied extensively to minimize fire hazards from aircraft seats. The objectives of this work are to expand the thermochemical model for the multilayered materials and to experimentally verify theoretical predictions. First, the thermochemical model is extended to any number of multilayered materials, by applying the same analysis technique used in the previous work. The additional constraints of temperature and heat flux continuities at every interface are also applied. A computer program is developed to predict burning behavior of seat cushion systems with and without a fire-blocking layer. Second, a series of tests burning seat cushions with and without a fire-blocking layer are conducted in a modified NBS Smoke Density Chamber. The results indicate that the predicted temperature profiles are in very good agreement with the experimentally determined ones, and that the same effectiveness of the fire-blocking layers are predicted as those of actual weight loss measurements. It is, however, observed that the formation and presence of a void inside of the polyurethane foam seem to cause the over-prediction of the temperature profile and under-prediction of the weight loss compared to the case when the void is small or nonexistent.
- Safety Engineering