The deflagration behavior of ammonium perchlorate (AP) with carbon black and copper chromite catalyst additives was studied over the pressure range from 0. 34 to 17 MPa (50 to 2500 psig) using light transmission and emission measurements in a window bomb as well as burn rate measurements in a conventional strand burner. It was found that a maximum value of the lower pressure limit P//D//L exists at intermediate values of carbon black concentration similar to that which has already been reported for copper chromite catalyst. It was also found that sufficiently high concentrations of carbon black augment the steady deflagration rate of AP. Since carbon black is not a catalyst of AP decomposition it is postulated that particle radiative feedback is more likely to be the cause of the observed behavior than catalyst effects as previously suggested. To quantify the amount of radiative heat feedback, flame temperature and emissivity values were calculated from light emission/transmission measurements.
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