Empirical cooling correlation for an experimental afterburner with an annular cooling passage

Koffel, William K., Kaufman, Harold R.
naca-rm-e52c13
1952


An empirical cooling correlation is established for an experimental high-performance afterburner. This correlation relates the average combustion-chamber wall temperature at a station near the combustion-chamber outlet to the temperatures of the cooling air and combustion gas, and to the mass flows of the cooling air and combustion gas. The correlation equation is a useful device for shortening the experimental investigation of afterburner cooling characteristics inasmuch as it provides a method for interpolating, or to a limited extent extrapolating, the critical wall temperatures for other combinations of the operating variables than those tested. For the experimental afterburner investigated, the circumferential average wall temperature could be correlated with a spread from the experimental data of plus or minus, +/-50 degrees R over a range of combustion-gas bulk temperature from 1810 degrees to 3500 degrees R. The results for this afterburner are believed representative of most high-performance afterburners.

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