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HEAT TRANSFER AT HIGH PULSATING FREQUENCIES IN A PULSE-JET ENGINE.
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA
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A review of the recent literature on enhancing forced-convection heat transfer by imposing a pressure pulse indicated that if the changes in pressure were great enough or at high enough frequencies materially higher coefficients could be expected than for the same mass flow rates in steady flow. No experiment was known which used sufficiently high pressures or frequencies to give real advantages. Tests were made on a small pulse-jet engine which showed increases in heat transfer by a factor of about 4. Further, the engine proved to be a uniquely good burner in that no auxiliaries beyond a starting spark were needed. Several possible practical applications of pulse-jet burners for purposes other than propulsion are suggested. Author
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