Investigation of heat-transfer coefficients in an afterburner

Koffel, William K., Kaufman, Harold R.

The relative importance of the heat-transfer modes in an experimental afterburner was evaluated. The convective heat-transfer coefficients near the combustion chamber outlet were determined and the effects of three radial distributions of afterburner fuel across the turbine-outlet annulus on the convective heat-transfer coefficient were examined. The combined heat-transfer coefficient for convection and radiation from the combustion gas to the combustion-chamber wall and the over-all heat-transfer coefficient were practically unaffected by the combustion-gas temperature level, but they varied, in similar manner, along the combustion chamber length. However, the convective heat-transfer coefficient without afterburning was practically constant along the combustion chamber length. The heat transferred from the combustion gas to the combustion-chamber wall by nonluminous radiation varied from about one-fifth to one-third of the total heat transferred by convection and radiation depending on the radial distribution of fuel across the turbine-outlet annulus.

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