Abstract

An experimental investigation was conducted to characterize the strand combustion of pure isopropyl nitrate (IPN) blended with a known de-sensitizer dibutyl sebacate (DBS). The blend was prepared with 75% IPN mixed with 25% DBS by weight so as to mimic the composition of Otto fuel II. Quartz tubes of 3, 5, 7.5, and 9 mm in diameters were utilized to create the strands of various diameters. The experiments were conducted in a quiescent atmosphere of air and the ambient pressure was varied from 5 to 40 bar in steps of 5 bar. Ignition of the strands was achieved by using a heated 60 μm Nichrome wire dipped in the liquid. The dependence of the linear burning rate of IPNDBS blends on ambient pressure as well as the strand diameter was elucidated. The temperatures in the flame zone were measured with K-type thermocouples of 250 μm diameter. The ambient pressure variation was investigated for a strand diameter of 5 mm while, the tube diameter variation was studied at 5 and 40 bar pressure. The linear burning rate of IPN-DBS blends in 5 mm diameter tube was found to rise with pressure. The gas phase temperature above the tip of the tube was measured using 250 μm K-type thermocouple. The burning rate of IPN-DBS blends was found to be lower than that of pure IPN as well as Otto fuel II.

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