Resonance burning

The average burning rate for the proplnt during these oscillations is always higher than expected. This phenomenon of unstable burning is known as resonance burning [See under Burning, Unstable (in Rocket Motors)]... 

With DLE eombustors, the aim is to burn most of the fuel very lean to avoid the high eombustion temperature zones that produee NOx. So these lean zones that are prone to oseillatory burning are now present from idle to 100% power. Resonanee ean oeeur (usually) within the eombustor. The pressure amplitude at any given resonant frequeney ean rapidly build up and eause failure of the eombustor. The modes of oseillation ean be axial, radial or eireumferential, or all three at the same time. The use of dynamie pressure transdueer in the eombustor seetion, espeeially in the low NOx eombustors ensures that eaeh eombustor ean is burning evenly. This is aehieved by eontrolling the flow in eaeh eombustor ean till the speetrums obtained from eaeh eombustor ean mateh. This teehnique has been used and found to be very effeetive and ensures eombustor stability. 

Theoretical Analysis of Resonance Tube , The Singer Company, Final Report KD 72-82 (1972) 58) F.J. Valenta, The State of the Art of Navy Pyrotechnic Delays , Expls Pyrots (The Franklin Institute Research Laboratories) 5, Nos 11 12 (Nov-Dec 1972). See also Ref 144, pp 185—95. See also Some Factors Affecting Burning Rates and Variability of Tungsten and Manganese Delay Compositions , Ref 144, pp 157—83. See also Mil Spec for Tungsten Delay Compositions , MIL-T-23132A (June 1972) 59) C.F. Parrish et al, Radiation... 

BURNS c s, HEYERICK A, KEUKELEiRE D D and FOBES M D E (2001) Mechanism for formation of the light struck flavour in beer revealed by time-resolved electron paramagnetic resonance, Chem Eur J, 7, 4554-61. 

Hoyle successfully predicts existence of a 7.6 MeV resonance state of the carbon-12 nucleus on grounds that otherwise little carbon would survive further processing into oxygen during stellar nucleosynthesis by helium burning, whereas in fact the C/O ratio is about 0.5. Discovery of strange particles. 

This section will focus on the stmcture and energetics of chiral molecular complexes studied with Fourier-transform IR (FT-IR), microwave, LIF, hole burning (HB), IR fluorescence dip spectroscopy, resonance-enhanced multiphoton ionization (REMPl Fig. 5), and RET spectroscopy. 

Fig. 13.17 shows the structure and principle of a T-bumer, as used to measure the response function of propellants. Two propellant samples are placed at the respective ends of the T-burner. The burner is pressurized with nitrogen gas to the test pressure level. The acoustic mode of the burning established in the burner is uniquely determined by the speed of sound therein and the distance between the burning surfaces of the two samples. When the propellant samples are ignited, pressure waves travel from one end to the other between the burning surfaces of the samples. When a resonance pressure exists for a certain length of the T-bumer, the propellant is sensitive to the frequency. The response function is determined by the degree of amplification of the pressure level. 

Simon, I., C. P. Burns, and A. A. Spector. Electron spin resonance studies on intact cells and isolated lipid... 

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