Effect of Charge Size on Cook-off Characteristics of AP/HTPB Base Bleed Propellant

doi:10.3969/j.issn.1000-1093.2017.08.010

Abstract

Abstract: To investigate the effect of charge size on the cook-off characteristics of ammonium perchlorate (AP)/ hydroxyl-terminated polybutadiene (HTPB) base bleed propellant, a cook-off model of base bleed propellant grain is established based on the two-step decomposition reaction mechanism of AP/HTPB. The AP/HTPB propellant is 72 mm in charge length and 43-53 mm in grain diameter, as well as 43 mm in grain diameter and 72-90 mm in charge length. The cook-off characteristics of AP/HTPB base bleed propellant are simulated at the heating rates from 1.0 K/min to 10.0 K/min. The results show that the cook-off time is shortened with the increase in the grain diameter of charge. As the charge length of AP/HTPB propellant with same grain diameter is added to 90 mm, the cook-off time is shortened remarkably. The charge size has little influence on ignition position. At the medium heating rates of 1.0-2.5 K/min, the ignition temperature rises with the increase in grain diameter and charge length. At the fast heating rates of 5.0-10.0 K/min, the charge has a less effect on the ignition temperature of AP/HTPB propellant. Key

Key words: ordnancescienceandtechnology, AP/HTPBbasebleedpropellant, chargesize, cook-off, numericalsimulation

CLC Number:

LI Wen-feng, YU Yong-gang, YE Rui. Effect of Charge Size on Cook-off Characteristics of AP/HTPB Base Bleed Propellant[J]. Acta Armamentarii, 2017, 38(8): 1532-1540.

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第38卷
第8期2017 年8月兵工学报ACTA
ARMAMENTARIIVol.38No.8Aug.2017

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