Study of Combustion Properties of a Solid Propellant by Highly Time‐Resolved Passive FTIR

Abstract

With a time resolution of 0.125 s and a spectral resolution of 4 cm−1, emission spectra of the combustion process of a solid propellant were recorded by highly time‐resolved passive FTIR. Some gaseous combustion products, such as H2O, CO, CO2, NO and HCl, were distinguished by the characteristic emission band of each molecule. The equation for flame temperature calculation based on the diatomic molecule emission fine structure theory was improved through judicious utilization of the spectral running number ‘m’ which makes the temperature measurement simpler and faster. Some combustion information of the solid propellant had been given including the characteristic spectral profile, the distribution of the absolute spectral energy, the distribution of the combustion flame temperature, and the concentration distributions of HCl and NO versus burning time. The results will provide theoretical and experimental bases for improving the formula and raising combustion efficiency of solid propellant, and developing the design of rocket motor, infrared guidance and antiguidance systems.

Acute exposure to titanium dioxide (TiO2) induces oxidative stress in zebrafish gill tissues

“…These findings confirm the accumulation of nanotitania in gill tissues as observed in kidneys of rainbow trout (Scown et al, 2009). FTIR peak occurred at approximately 1400 cm-1 corresponding to the C-O stretch bonds as characterized in residual organics samples (Zhang et al, 2006). The peak at 1630 cm -1 and the broad band at 3000-3600 cm-1 are due to A c c e p t e d M a n u s c r i p t…”

2006–2008 Annual Review on Aerial Infrared Decoy Flares

“…Neutz and Weiser found that it is possible to separate the functional requirements for spectral flares in that they combined a high temperature payload with very little black body signature and a payload contributing in providing a selective emitter like carbon dioxide [17,18]. They combined thermites based on Al/Fe 2 O 3 , Sr(NO 3 ) 2 , and energetic organic binder to give the so-called "pyro-organic" flare [20] of propellant compositions containing nitrocellulose and nitroglycerin similar to the compositions described by Gaisbauer et al [4].…”

Direct Determination of Effective Spectral Emissivity of Hot Burnt Gas using Absolutely Calibrated Radiometric Spectrometer

“…Also, self-absorption phenomena make the determination of flame temperature and effective emissivity difficult by spectroscopic analysis [7]. In order to avoid the complexity of the problem, particularly in propellant combustion mentioned above, and for infrared radiation, spectra from product molecules in hot burnt gases of flame have been widely utilized to estimate flame temperature where thermodynamic equilibrium can be assumed [8][9][10].…”