摘要
无杆式高压气动弹射器因开口的固有结构决定其存在一定量的泄漏,为此设计并开展样机泄漏测试试验。基于由实验数据拟合的标准干空气热力学状态方程,分别按理想气体和真实气体对比计算泄漏率,并拟合泄漏率随压力、行程变化的经验公式。建立考虑动态泄漏、真实气体效应及真实开阀规律的精确内弹道模型,对考虑和不考虑泄漏两种工况的结果进行对比,并详细分析考虑泄漏的弹射过程中热力学参数与负载运动参数的变化规律,将其与弹射试验数据、流体仿真结果进行对比。研究结果表明:按理想气体计算的泄漏率比真实气体偏小约4%;泄漏率不超过4%/s;考虑泄漏的精确内弹道模型计算结果与弹射试验数据、流体仿真结果均基本一致,具有较高的计算精度。
The rodless high-pressure pneumatic catapult experiences a certain amount of leakage due to the inherent structure of the opening.In this study,a prototype leakage test is designed and conducted.Based on the standard dry air thermodynamic equation of state fitted by the experimental data,the leakage rate is calculated and compared under the hypothesis of ideal gas and real gas.The empirical formula of leakage rate varying with pressure and stroke is fitted.An accurate interior ballistic model considering dynamic leakage,real gas effects,and the real valve opening law is established.The two working conditions with and without leakage are solved numerically and compared.Then,the variation laws of thermodynamic parameters and load motion parameters in the ejection process with leakage are analyzed in detail and compared with the ejection test data and fluid simulation results.The results show that the leakage rate calculated under ideal gas assumption is about 4%lower than that under real gas assumption.Moreover,the calculated leakage rate shall not exceed 4%/s.The calculation results of the accurate interior ballistic model considering leakage are basically consistent with the ejection test data and the fluid simulation results,indicating high calculation accuracy.
作者
王雪琴
马吴宁
马大为
王尚龙
张震东
WANG Xueqin;MA Wuning;MA Dawei;WANG Shanglong;ZHANG Zhendong(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China;Engineering Design Institute,Army Academy,Nanjing 210016,Jiangsu,China)
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2023年第7期1867-1880,共14页
Acta Armamentarii
基金
国家自然科学基金项目(11902160)。
关键词
无杆式高压气动弹射器
真实开阀规律
内弹道
泄漏
真实气体效应
rodless high pressure pneumatic catapult
real valve opening law
internal ballistics
leakage
real gas effects
