The decomposition of hydrazine on Shell 405 catalyst has been studied at pressures from 500 to 5050 psi. A novel laboratory apparatus was developed with which the propellant flow rate and reaction pressure could be remotely and independently varied and monitored. Virtually unlimited run times were possible.
The investigation of the decomposition of hydrazine on Shell 405 (iridium-on-alumina catalyst) was extended to a pressure of 9100 psi. The ammonia concentration in the products increased with increasing pressure in a manner consistent with the data reported earlier (Wood and Bryant, 1973) for lower pressures (500-5050 psi). Based on a two-step mechanism for the reaction N2H4 -%NH3 + 1/3n2; nH3 -*• (1 -X)NH3 + 1/2XN2 + %XH2, the fraction (X) of the ammonia dissociated decreased to a value of 0.532 at 9100 psi and was independent of bed loading.
561g Q '(t, oo) = (l/u e ) dwjdt ; 0 2 '({, (») = 0 0 0 K.°o)=l; 02(£oo) = 0 3 « f oo) = 0 and at the wall, /o'«. 0) =/ 2 '«, 0) =/,'«, 0) = 0 0o'«.0) = 0; 0 2 '(£,0)=1 0&.0) = TJT e ; 0 2 (£,0) = 0 3 (£,0) = 0
ExampleAs a numerical example Eqs. (4) and (6) were solved for a spinning 11-cm-diam tangent-ogive cylinder at a Mach number of 3.0 and at 4.0° incidence 5 by the techniques described in Ref. 6. Typical results for one axial body station are summarized in Figs. 1 and 2. The results indicate that there is very little modification of the tangential velocity profiles and the temperature profiles for spin parameters within the range of validity of perturbation analysis. This is in general agreement with the experimental results of Ref. 5.
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