Chemistry associated with hypersonic vehicles

Hypersonic and High-Temperature Gas Dynamics, Second Edition

“…The temperature range of the data listed in Table 13.1 is approximately from 800 to 6000 K. Also, the preceding values of C 1 are C 2 are different if the O 2 , N 2 , or NO are in a mixture of different gases. For example, if O 2 is in a bath of N 2 molecules, then the vibrational relaxation time for O 2 caused by collisions with N 2 is quoted in [158] as given by C 1 ¼ 1.36 Â 10 -4 atm-ms and C 2 ¼ 2.95 Â 10 6 K.…”

“…Such a mechanism, along with the appropriate rate constants, is given in Table 13.2. These data were compiled by Dunn and Kang in [162], and the table is readily found in [158]. In this table, a form of the rate constant similar to that given in Eq.…”

“…(13.46). Tables 13.4 and 13.5 are obtained from [158], based on data supplied by C. Jachimowski frorn the NASA Langley Research Center. In Table 13.5 are some third-body efficiencies for several reactions where H 2 and H 2 O are the third bodies, that is, the collision partner denoted by M in some of the chemical equations.…”

“…An interesting study of equilibrium properties behind normal and oblique shock waves for velocity-altitude points following trajectories for a transatmospheric vehicle was recently given by Bussing and Eberhardt in [158]. The trajectories are shown on the velocity-altitude map in Fig.…”

“…This introduces a dimensional scale in such flows. For example, Bussing and Eberhardt [158] define a nonequilibrium length scale (or relaxation distance) as the distance downstream of the shock front required for the flow properties to reach 95% of their equilibrium values. For any given flow, the relaxation distances are different for different variables.…”