Effect of Experiment Environment on Calorimetric Value of Composite Solid Propellants
The calorimetric value (cal-val) of solid rocket propellants and explosives is determined in the presenceof inert atmosphere using industrial nitrogen gas. However, due to presence of trace amount of oxygen, the cal-val is not always correct. To avoid such inaccuracy in cal-val, a systematic study has been carried out by takingdifferent types of solid propellant samples having burning rate in the range of 5 mm/s − 30 mm/s at different pressures.The data obtained were acquired using industrial nitrogen, ultra high pure nitrogen (UHP-N2), ultra high pureargon (UHP-Ar), air and ultra high pure oxygen (UHP-O2). The data reveal that cal-val is highest in the case ofUHP-O2 due to complete combustion while in the case of air and industrial nitrogen it is found to be substantiallyless. Moreover, the cal-val in the presence of UHP-N2 and UHP-Ar meets the standard value with reproducibility.The results, further, confirm that for authentic cal-val, the most suitable environment is UHP-N2/UHP-Ar.
Defence Science Journal, 2013, 63(5), pp.467-472, DOI:http://dx.doi.org/10.14429/dsj.63.2896
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