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Records 561 to 565 of 733
| Title: |
Ablative Thermal Protection at Low Heating Rates |
| Author: |
Ronald B. Pope |
| Abstract: |
Evaluation of ablative materials for thermal protection at low heating rates is discussed. Initially, 21 different materials with densities between 255 and 2200 kg/m were evaluated by performing convective heating tests in arc heated nitrogen streams and observing the backface, temperature rise and surface recession. Modified polyurethane foam composite, which has characteristics desirable for ablative thermal protection, was evaluated and excellent insulative performance was demonstrated. Ablative performance of the foam materials is compared with the performance of �state-of-the-art� materials and with analytical predictions. |
| Report: |
FSR-0201 |
Pages: |
12 |
Size: |
821 KB |
| Title: |
Characteristics Of Aircraft Fire Detection Systems |
| Author: |
Julius J. Gassmann |
| Abstract: |
The purpose of this project was to study the characteristics and evaluate the performance of the fire detection systems used on present day jet aircraft or proposed for use in the immediate future and to provide information with respect to tendencies to produce false fie warnings. |
| Report: |
FSR-0035 |
Pages: |
26 |
Size: |
1.78 MB |
| Title: |
Evaluation of a Polyurethane Foam for Ablative Protection at Low Heating Rates |
| Author: |
Ronald B. Pope |
| Abstract: |
The surfaces of many entry vehicles, such as the cone frustum afterbody of the Apollo vehicle are exposed to heating rates that do not exceed 200 w/m. Proposed missions where entry vehicles will have similar low heating environments include �out-of-orbit� probes into Mars and the upper surfaces of some lifting entry bodies. Nevertheless, these heating environments are sufficiently severe that ablative heat protection is attractive, provided that the ablative material 1) produces a char for radiating energy from the surface, 2) has a low thermal conductivity to minimize heat conducted to the vehicle structure, 3) has a low density to minimize heat shield weight, and 4) is sufficiently strong to preclude damage before entry and can resist surface remodel by oxidation of shear during entry. Many available ablative materials satisfy all but the low-density requirement (e.g. see Ref 1). |
| Report: |
FSR-0202 |
Pages: |
3 |
Size: |
215 KB |
| Title: |
Foam and Dry Chemical Application Experiments |
| Author: |
George B. Geyer |
| Abstract: |
Full-scale tests were conducted under fixed fire conditions employing air-aspirating foam and dry powder dispensing equipment in which six different foam agents and three different dry chemical powders were evaluated, both alone and in combination. The time required to control circular pool fires of 40, 60, and 80 feet in diameter, containing an obstacle and a three-dimensional fire, was determined. |
| Report: |
RD-68-55 |
Pages: |
55 |
Size: |
3.6 MB |
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