基于氧耗散模型的燃气弹射内弹道仿真方法及验证  

Simulation method and verification of gas ejection interior ballistic based on oxygen dissipation model

作　　者：王金龙 余佳 周峤 王翔鹏 WANG Jinlong;YU Jia;ZHOU Qiao;WANG Xiangpeng(Beijing Institute of Space Launch Technology,Beijing 100076,China)

机构地区：[1]北京航天发射技术研究所,北京100076

出　　处：《固体火箭技术》2024年第5期745-750,共6页Journal of Solid Rocket Technology

摘　　要：在低温燃气弹射内弹道数值仿真中,由于经典零维模型未考虑一次富燃燃气在低压室内的二次燃烧,导致预示结果相比试验结果有较大偏差。针对上述问题,引入氧耗散模型描述低压室内一次燃气二次燃烧效应,建立了考虑二次燃烧影响的燃气弹射内弹道零维预示模型,对不同工况下燃气弹射内弹道过程进行数值仿真分析,并结合有限速率/涡耗散模型CFD仿真结果及试验测试结果进行对比分析。结果表明:富燃气体进入低压室后迅速与空气掺混发生二次燃烧,在涡流的卷吸作用下二次燃烧反应剧烈,0.2 t_(0)时刻低压室内O_(2)消耗殆尽,二次燃烧反应结束。基于氧耗散模型的零维弹射内弹道计算方法可以表征弹射过程中低压室压力变化规律,具有计算量小、时间短的优势,能够对不同结构及工况下的弹射过程进行较好的预示,仿真计算误差小于4.5%,为燃气式弹射内弹道设计提供了一种新的便捷式迭代计算方法。In numerical simulation of internal ballistic of low-temperature gas ejection,the predicted results have large deviation from the experimental results because the classical zero-dimensional model does not consider the secondary combustion of primary fuel-rich gas in the low-pressure chamber.In view of the above problems,the oxygen dissipation model was introduced to describe the secondary combustion effect of primary gas in low pressure chamber,and a zero-dimensional prediction model of gas ejection interior ballistics considering the influence of secondary combustion was established.The numerical simulation analysis of gas ejection interior ballistics process under different working conditions was carried out,and the CFD simulation results of finite rate/eddy dissipation model and experimental test results were compared and analyzed.The results show that the rich gas enters the low pressure chamber and quickly mixes with the air to undergo secondary combustion,and the secondary combustion reaction is violent under the entrainment of the vortex.At the moment of 0.2 t_(0),the secondary combustion reaction ends because the oxygen in the low-pressure chamber is exhausted.The zero dimensional ejection internal ballistic calculation method based on the oxygen dissipation model can characterize the pressure changes in the low-pressure chamber during the ejection process with the advantages of small computational complexity and short time.The model can effectively represent the pressure changes in low-pressure chambers of ejection devices with different structural forms,and the simulation calculation error is less than 4.5%.The research can provide a new convenient iterative calculation method for the interior ballistics design of gas-fired ejection.

关 键 词：燃气弹射 内弹道 氧耗散模型 二次燃烧 

分 类 号：V553[航空宇航科学与技术—人机与环境工程]