Experimental study of the burner for FAA fire test: NexGen burner

Abstract

Summary The NexGen (Sonic) burner is the new burner developed by the Federal Aviation Administration, FAA, to replace old oil burners used for the required fire certification tests on power plant‐related materials, as it provides the capability to control both air and fuel flow rates. During a fire test, the burner is supposed to simulate a certain fire condition, so the flame properties should be robust and repeatable. The NexGen burner can achieve this due to the precise fuel and air controls. However, the current calibration criterion (ISO2685:1998 and AC20‐135) may not be good enough to ensure consistent flame properties. In the presented work, the sensitivity of the burner performance to air and fuel flow rate, as measured by the temperature and heat flux for calibration purposes, was studied. Additionally, the influence of the turbulator and the thermocouple size used for flame calibration was also studied. The impact of varying fuel/air ratio and thermocouple sizes was studied by conducting fire tests on aluminum samples, to show the inadequacies in the current calibration standards.

Fire behaviour of carbon fibre epoxy composite for aircraft: Novel test bench and experimental study

“…During the development of this new test bench, investigations of the influence on the propane flow rate, the quality and the temperature of propane gas at the input of the burner, and the temperature of the input air of the burner and of the cooling water have been done. These investigations are consistent with the study at the University of Cincinnati 7 on the ISO2685:1998(E) burner showing that the heat flux can be influenced mainly by the temperature of the fuel, the flow rate of the fuel and the flow rate of the air. That is why in our new test bench, the temperature and flow rate of the propane gas are maintained constant by a flowmeter and a thermocontroller.…”

Investigation of the flame properties and fire behavior of carbon‐reinforced PEKK, BMI and phenolic composites impacted by Jet‐A1/air flames

“…These trends are essential for understanding the combustion behavior and optimizing the combustion process in various applications, including those in aircraft engines and other combustion systems. 19 F I G U R E 5 Effect of equivalence ratio on the gas emission species.…”

“…There are many studies on the combustion behavior of kerosene flames at both small and medium scales, but there is still a need for research on the fire response properties of large oil burners (the criteria for defining the scales of thermal and fire facilities used for testing materials are based on the test conditions such as the generated maximum flame temperature, heat flux, etc., and the specimen dimension impinged by the flame), particularly with the specific burner type being considered. 19,20 This is important for gaining a deeper understanding of how these burners behave and identifying ways to optimize their performance (in terms of maximum flame temperature, heat flux, and gas emission concentration). 20 Aviation test standards have been the subject of in-depth investigations and analyses since they are essential to assuring the safety and dependability of airplanes.…”

Effects of Al, Zn, and rare earth elements on flammability of magnesium alloys subjected to sonic burner–generated flame by Federal Aviation Administration standards

“…The testing burner is the NexGen oil burner by GovMARK, USA, in compliance with the FAA standards for Mg-alloy flammability test. 27,30,31 The burner system works as follows: the air supplied by a compressor is ducted through a cylindrical draft tube containing stators (diffusing air) to a bell-shaped cone, and the pressurized aviation kerosene is introduced into the same cone by a fuel tube and atomized. The air and atomized fuel mix in the cone, and their mixture is ignited by a spark plug, creating an intense jet flame.…”