Afterburner

About: Afterburner is a research topic. Over the lifetime, 811 publications have been published within this topic receiving 5944 citations.

On the Dominant Noise Components of Tactical Aircraft: Laboratory to Full Scale

Abstract: This paper investigates the dominant noise components of a full-scale high performance tactical aircraft The present study uses acoustic measurements of the exhaust jet from a single General Electric F414-400 turbofan engine installed in a Boeing F/A-18E Super Hornet aircraft operating from flight idle to maximum afterburner The full-scale measurements are to the ANSI S1275–2012 standard employing about 200 microphones By comparing measured noise spectra with those from hot supersonic jets observed in the laboratory, the dominant noise components specific to the F/A-18E aircraft at different operating power levels are identified At intermediate power, it is found that the dominant noise components of an F/A-18E aircraft are essentially the same as those of high temperature supersonic laboratory jets However, at military and afterburner powers, there are new dominant noise components Their characteristics are then documented and analyzed This is followed by an investigation of their origin and noise generation mechanisms

General purpose incinerator/combustor

Abstract: An incinerator/combustor, comprising an elongated combustion chamber surrounded by an afterburner which is in turn surrounded by a housing, the afterburner and housing being coaxial with, and cooperating to provide redundant heating for, the combustion chamber, is disclosed. The combustion chamber is generally cylindrical with a horizontal axis, one end being adapted to receive materials to be burned. An ash chamber is spaced from the other end of the combustion chamber to define a circumferential opening which serves as an exhaust outlet. The two chambers are relatively movable to permit the flow of exhaust gases to be controlled. Air under controlled pressure is introduced to the combustion chamber to produce a cyclonic flow to enhance burning. A fuel supply may be provided to initiate combustion, but the system is designed to require no fuel other than the material being incinerated during normal continuous operation. The afterburner extends over both the exhaust outlet and a major portion of the combustion chamber. Air under pressure directed across the exhaust outlet produces a Venturi effect to draw exhaust gases out of the combustion chamber and direct them into the afterburner. The outer housing receives exhaust gases from the afterburner and directs them back over the outside surface of the afterburner in a second redundant flow, carrying them to an outlet stack.

Aerodynamic flow investigations in an isothermal model of an afterburner

Abstract: Experimental and numerical investigations of the three-dimensional flowfields in an isothermal model of an afterburner are presented Five-hole pilot probe measurements along the entire length of the model in three different azimuthal planes, allow the determination of three mean velocity components which provide comprehensive information to aid understanding of such complex flows The numerical calculations are performed using a SIMPLE based algorithm with staggered grid arrangement The standardk-ɛ model is used for physical modeling The numerical results agree quite satisfactorily with the time-mean velocity measurements The predicted turbulence kinetic energy contours have also been presented

Mobile incinerator for animal carcasses

Abstract: Animal carcasses are comminuted, minced or macerated and fed into a rotary furnace 1 for incineration Bone and charcoal leaves by exit chute 10 and smoke laden gas is further burnt in an afterburner 11 At start-up the furnace is preheated by a burner 8 Upon entry fat ignites and following this combustion is maintained by preheated combustion air Preheated combustion air and a burner are arranged tangentially in the afterburner to induce swirl and reduce the forward velocity of the gasses in the afterburner towards the exit This increases the reaction time and ensures good mixing with the preheated combustion air The combustion air is preheated by gasses exiting the apparatus via a heat exchanger 16 The apparatus is mobile and is used for incinerating BSE infected carcasses