Errata: GLInitial Temperature and Pressure Effects on Composite Solid Propellant Burning Rates: Comparisons with Theory"

Abstract

Pressure vs burning rate data are presented for an ammonium perchlorate composite solid propellant at four levels of initial temperature. For each level of initial temperature the data are fitted by least squares to the equation P/r = a + bPN. Three values of N are considered at each temperature level, N — 1, N = f and N = value for best fit to the data. These fits are then used to evaluate the relative merits of two burning rate laws, N = 1.00 corresponding to a law that includes the axisymmetric jet diffusion flame theory and N = f corresponding to the Summerfield granular diffusion flame theory. The relative variation of the parameters a and b with temperature is compared with the expectation of the Summerfield theory. It is concluded that although N = f gives a superior fit to N = 1.00, no law of the type P/r = a + bPN fits the data without systematic error and that the variation of best fit N with initial temperature casts doubt upon the physical model underlying both burning rate laws. The burning rate law suggested by Fenn, P/r = a + brPN also is tested. Its best fit is superior to that for N = 1 in the previous equation but it is inferior to the fit of that law for N = or N taken as the best fit value.