In this study the thermal oxidative stability of a kerosene-type Jet A-1 commercial aviation fuel has been investigated by using a three-dimensional (3-D) excitationemission matrix fluorescence (EEMF) method. The fuel was thermally stressed in flow test conditions over a range of temperatures in the autoxidative regime. To determine the effect of dissolved oxygen on aviation fuel thermal stability, the measurements were conducted for both air-saturated and fully deoxygenated fuel samples. The increase in fuel temperature results in a large red-shift of the fluorescence signals for the air-saturated fuel; however, fully deoxygenated fuel showed no difference in the fluorescence spectra with respect to neat fuel. The observed increase in the emission wavelengths of the collected spectra may be attributed to the formation of high-molecular mass compounds within the liquid fuel. These species are formed as a consequence of the chemical reactions activated during the thermal stress. The use of 3-D fluorescence spectra for aviation fuel analysis is shown to be a fast, suitable and easily implementing tool to establish a fuel quality verification procedure. Also, the level of fuel thermal degradation may be ascertained using this method and may be of great interest in the aim of better thermal managing control of turbine engines.
EXPERIMENTAL INVESTIGATION OF AVIATION FUEL THERMAL OXIDATIVE STABILITY
M Commodo;
2011
Abstract
In this study the thermal oxidative stability of a kerosene-type Jet A-1 commercial aviation fuel has been investigated by using a three-dimensional (3-D) excitationemission matrix fluorescence (EEMF) method. The fuel was thermally stressed in flow test conditions over a range of temperatures in the autoxidative regime. To determine the effect of dissolved oxygen on aviation fuel thermal stability, the measurements were conducted for both air-saturated and fully deoxygenated fuel samples. The increase in fuel temperature results in a large red-shift of the fluorescence signals for the air-saturated fuel; however, fully deoxygenated fuel showed no difference in the fluorescence spectra with respect to neat fuel. The observed increase in the emission wavelengths of the collected spectra may be attributed to the formation of high-molecular mass compounds within the liquid fuel. These species are formed as a consequence of the chemical reactions activated during the thermal stress. The use of 3-D fluorescence spectra for aviation fuel analysis is shown to be a fast, suitable and easily implementing tool to establish a fuel quality verification procedure. Also, the level of fuel thermal degradation may be ascertained using this method and may be of great interest in the aim of better thermal managing control of turbine engines.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
