| Autor: |
Kenoyer, D. A., Salvador, I., Myrabo, L. N., Notaro, S. N., Bragulla, P. W. |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 10/8/2010, Vol. 1278 Issue 1, p689-698, 10p, 1 Black and White Photograph, 4 Diagrams, 1 Chart, 6 Graphs |
| Abstrakt: |
A twin Lumonics K922M pulsed TEA CO2 laser system (pulse duration of approximately 100 ns FWHM spike, with optional 1 μs tail, depending upon laser gas mix) was employed to experimentally measure both axial thrust and beam-riding behavior of Type [sharp/mesh/hash_synonym]200 lightcraft engines, using a ballistic pendulum and Angular Impulse Measurement Device (AIMD, respectively. Beam-riding forces and moments were examined along with engine thrust-vectoring behavior, as a function of: a) laser beam lateral offset from the vehicle axis of symmetry; b) laser pulse energy (∼12 to 40 joules); c) pulse duration (100 ns, and 1 μs); and d) engine size (97.7 mm to 161.2 mm). Maximum lateral momentum coupling coefficients (CM) of 75 N-s/MJ were achieved with the K922M laser whereas previous PLVTS laser (420 J, 18 μs duration) results reached only 15 N-s/MJ-an improvement of 5x. Maximum axial CM performance with the K922M reached 225 N-s/MJ, or about ∼3x larger than the lateral CM values. These axial CM results are sharply higher than the 120 N/MW previously reported for long pulse (e.g., 10-18 μs) CO2 electric discharge lasers. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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