Showing papers on "Afterburner published in 1982"

Afterburner flameholder ion probe

Abstract: An ion/electrostatic probe for an afterburning gas turbine jet engine comprises an afterburner flameholder (24) electrically insulated from other engine parts by means of non-electrically-conductive support rods (30, 45) or by means of electrically conductive rods (30) insulated (50, 52) from the engine case (12) An electrical connection (54) may be brought through the engine case The flameholder (24) may be insulated (70) from an attached igniter

Electrostatic afterburner light-off detector

Abstract: A light-off detector for an afterburner of a gas turbine jet engine comprises an afterburner flameholder (24) electrically insulated (70) from an attached igniter (38) and insulated from other engine parts by means of non-electrically-conductive support rods (30, 45) or by means of electrically conductive rods (30) insulated (50, 52) from the engine case (12) and insulated (70) from an attached igniter (38). An electrical connection (54) brought through the engine case connects the flameholder to a resistor (57) through a bias battery (56). Ionic current flow resulting from flame causes a Schmidt trigger (60) to provide a light-off signal, A/B LIT (62).

Evaluation of a simplified gross thrust calculation method for a J85-21 afterburning turbojet engine in an altitude facility

Abstract: A simplified gross thrust calculation method was evaluated on its ability to predict the gross thrust of a modified J85-21 engine. The method used tailpipe pressure data and ambient pressure data to predict the gross thrust. The method's algorithm is based on a one-dimensional analysis of the flow in the afterburner and nozzle. The test results showed that the method was notably accurate over the engine operating envelope using the altitude facility measured thrust for comparison. A summary of these results, the simplified gross thrust method and requirements, and the test techniques used are discussed in this paper.

Controlling method of air fuel ratio

Abstract: PURPOSE:To control the ratio of fuel and air to be supplied to a main burner by a method wherein ambient gas within a furnace body is induced in an afterburner to be re-burnt by supplying the predetermined amount of combustion air and the controlling of said ratio is performed in accordance with the measured result of the oxygen concentration in the resultant combustion gas. CONSTITUTION:A part of the ambient gas within the furnace body 1 is induced in the afterburner 14 by means of a proportioning feed pump 13 and burnt by constantly supplying the combustion air with a proportioning feed pump 15. The measuring signal, which is generated by the value of oxygen concentration in the combustion exhaust gas measured with an O2 analyzer 16, is compared with the set signal of a fuel air ratio setter 11 by means of an O2 regulator 12 in order to input the difference signal between the two signals just mentioned above to a ratio setter 10 so as to automatcially control the set ratio of the ratio setter 10 in proportion to the oxygen concentration.

Refuse incinerator with feed heat and afterburner - has furnace indirectly heated by afterburning cell running through it

Abstract: The refuse incinerator is based on a conventional furnace with feeding, oil-gas fired heating and afterburning arrangements. The heater (4) is an ignition and back-up burner for a burning-out cell (3), pressure-fed with furnace gas and secondary air (5) heating the furnace (1) indirectly. A flue-gas cooling arrangement (6) doubles as an ejector and secondary-air heater (7). The air lines to furnace and cell embody flow controllers (8,9). The burner modulates to keep cell temp. constant, its air supply being proportioned to that of furnace gas. Secondary air to the furnace is controlled first at sub-stoichiometric then at stoichiometric level.