B/KNO3燃烧性能参数计算

B/KN03点火药具有燃烧热值高、点火能力强以及安全钝感等特点，在直列式点火系统中有较广泛的应用。对B／KN0燃烧性能参数进行理论计算，有助于指导这类点火系统的设计。本文利用VLW状态方程和最小自由能原理对B/KN03的燃烧性能参数进行了计算。计算前，采用最小二乘法对JNNAF热力学函数表中的有关数据进行拟合，得到了硼系氧化产物的标准焓和标准熵的温度函数系数。计算得到装填密度为0.31 g／cm3的B/KN03火药力、余容以及最大燃烧压力为2.145×lo5 J/kg、4.47×10 -4 m3/kg和78.23 MPa，分别与密闭爆发器实验值2.116×105 J/kg、4.418×10 -4 m3/kg和76 MPa接近。

The Calculation of Combustion Characteristics of B/KNO3

B/KNO3 is a safe and inert kind of amorce, whose combustion releases high heat and can ignite insen?sitive secondary explosives, and is widely used in direct ignition systems. Theoretically calculating the combus?tion characteristics of B/KNO3 may benefit the design of such systems. In this paper, the VLW EOS and the minimum free energy theory were used to calculate the combustion characteristics of B/KNO3. Before calculation, JANAF thermochemical table was fitted to determine the thermodynamic function coefncients of boron oxide by method of the least square. The impetus, covolume and maximum constant volume pressure of 0.31 g/cm3 B/KNO3 were got by the calculation, which are 2? 145 X 1O5 J/kg, 4.47 X IO4 m3/kg and 78? 23 MPa, respectively. These results are close to the closed bomb test values 2.116 X IO5 J/kg, 4.418 X IO-4 m3/kg and 76 MPa individually.