密闭爆发器实验中发射药燃烧全过程压力曲线的修正方法

分析了造成密闭爆发器实验时压力损失的两个因素,从造成压力曲线损失的理论关系式出发,无须测量密闭爆发器的壁温曲线,仅根据压力曲线得到了一种适用于火药燃烧的全过程的压力修正方法.该方法能反映出燃气热力参数及余容对压力损失的影响.通过爆发器实验,与传统的修正方法比较,不仅能修正得到火药力和余容,还能修正燃烧全过程的压力曲线以及燃速曲线.新建立的修正方法简单,更具有实用价值.

A New Correcting Method for Pressure Curve in the Whole Burning Process of Propellants in Closed Bomb Test

Two factors resulting in pressure loss in closed bomb test were discussed. A new correcting method for pressure loss was established in light of theoretical equation used for pressure loss correcting and the pressure-time curves measured in closed bomb tests, and the temperature- time curve of vessel wall is unnecessary. Established method can interpret the effects of gas thermodynamical parameters and covolume on pressure loss in closed bomb. Compared with the conventional correcting methods for pressure loss, the new method can obtain not only the propellant force and covolume, but also the pressure curves and burning rate curves in the whole burning process of propellants. Results of closed bomb tests show that the new established method is simple and practical.