制导炮弹尾翼膛内工作异常现象分析

Abnormal Phenomenon Analysis of Fins' Work in Bore for the Guided Projectile by Gun

在某型制导炮弹试验过程中发生了多次尾翼片磨损、气缸气孔烧蚀现象,为分析尾翼张开异常的原因,研究了气缸张开式尾翼膛内工作过程,建立了高温高压火药气体作用下的气孔烧蚀模型,并与内弹道一维两相流模型进行了联立求解,得到了气孔直径、活塞气缸内压力的变化规律。仿真计算结果表明,受火药气体烧蚀作用的影响,气孔直径不断扩大,气缸压力明显增大,尾翼受到气缸内活塞的推动在炮膛内部张开,从而使尾翼片与膛线剧烈碰撞而使尾翼损坏,出炮口后尾翼无法正常工作。研究结果对该型制导弹药气缸张开式尾翼的设计和改进有重要参考价值。

To study mechanism of abnormal opening of the guided proj ectile ’s fins,the performance process of fins in bore was analyzed with the phenomenon that the guided proj ectile＇s fins were attrited and the air holes were ablated during many experiments.The ablation model of cylinder air hole was established in the effect of the high temperature and high pressure gunpowder gas and the law of diameter of air hole and pressure within the piston cylinder were obtained combining the ablation model with the one-dimensional two-phase flow model.The calculation results show that the diameter of air hole is expanded continually in the ablative effect of gunpowder gas and the pressure of the piston cylinder is enlarged obviously.The fins are opened during the gun bore in the cylinder piston role and collided with artillery rifling violently so that the fins can not work properly out of the muzzle.The results provide an important refer-ence value for designing and improving the cylinderopen fin of the guided proj ectile.