RT Journal Article ID 66f031687d7cf59d A1 Wada, Yutaka A1 Seike, Yoshio A1 Nishioka, Makihito A1 Tsuboi, Nobuyuki A1 Shimada, Toru A1 Hasegawa, Katsuya A1 Kobayashi, Kiyokazu A1 Hori, Keiichi T1 COMBUSTION MECHANISM OF TETRA-OL GLYCIDYL AZIDE POLYMER AND ITS APPLICATION TO HYBRID ROCKETS JF International Journal of Energetic Materials and Chemical Propulsion JO IJEMCP YR 2009 FD 2009-12-01 VO 8 IS 6 SP 555 OP 570 AB A basic study to clarify the combustion mechanism of glycidyl azide polymer (GAP) has been conducted. Temperature during the strand burner and 60-mm diameter motor tests was measured. The strand tests were performed with 2.5-μm diameter S-type thermocouple, embedded in GAP samples, with pressure ranging from 1 to 10 MPa. The 60-mm diameter motor tests were done with end-burning grains and the temperature inside the motor was measured with a 1.0 mm diameter K-type thermocouple with a pressure range from 3 to 10 MPa. The motor tests show the gas temperatures to be approximately 80 K higher than the strand tests and both temperatures are significantly lower than adiabatic temperature. The efficiency of C*, ηC*, is in the range of 0.7 to 0.85 depending on pressure and L*. Combustion residue of GAP was investigated and it was found to be composed of soot (black in color), high viscosity residue, and a yellow powder, which was only observed at high pressures. These residues were analyzed by means of Scanning electron microscope (SEM) and Fourier transform infrared spectrometer (FTIR), and mass balance was also measured. One-dimensional three-phase mode combustion model of GAP has been constructed based on the Beckstead model. Modifications were made taking into account experimental observations. A blow-off mechanism was added in residue behavior and full kinetics chemistry was entrained in the bubbles at the two phase region. The burning rate and temperature profile were numerically simulated adjusting for kinetic parameters. The rapid temperature increase and final temperature are expressed well in this simulation and the calculated burning rate coincides well at medium pressures. PB Begell House LK https://www.dl.begellhouse.com/journals/17bbb47e377ce023,2812cf212d05a1a7,66f031687d7cf59d.html