Bell Boeing V-22

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7. Variation of rotational populations with temperature. 0 Wavelength (pm) Fig. 8. Spectra of target and background viewed from space. 9) where the spectral radiance (specific intensity) I, in a particular direction along a path s depends on the emission coefficient j(v,s) and the absorption coefficient k(v,s). Both of these are functions of the optical frequency v and the conditions, particularly the temperature, along the path, and of the local density of emitting and absorbing species p(s). For t+hespecial case of a nonscattering field in local thermodynamic equilibrium (LTE), such as a plume without particulate components,t the *Local thermodynamic equilibrium in a gas dynamic system prevails when the rates of distribution of internal energy by collisions are very rapid compared to the rates of change in the gas temperature caused by expansion or compression in the flow, and to the radiative lifetimes of the emitting species.

2,3. D. Y. (private communication, circa 1977). 4. J. S. AFRPL-TR-74-65 (1974). 1. *Sources of such data are discussed in Chapter 14. References 37 Fig. 19. Shock wave attached to vehicle. 1 Origin of Emission Rocket exhaust plume emission is generally thermal in character, arising from changes in the internal energy of the constituent molecules, the products of combustion. Those changes in the molecular energy levels are accompanied by the emission of radiation, provided certain quantum-mechanicalconditions are met.

Formed in part by pyrolysis of the fuel fragments, the resultant soot passes through the chamber and nozzle intact, because the stoichiometry of the highpressure combustion does not favor reaction of condensed carbon with the oxidizer. ) The usual methods for estimating the composition of exhaust products from a rocket engine as input to a plume code, discussed in Chapter 4,assume combustion of well-mixed reactants under conditions of thermal and chemical equilibrium. Those assumptions are quite inappropriate for a real rocket engine in which the vaporization, mixing, and combustion processes are characterized by unsteadiness and local inhomogeneity.

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