摘要
以往在对枪管温度场进行分析计算时,均忽略了枪管膛线、散热槽等特殊结构及枪管对与其接触的零部件的传热对枪管温度场的影响,导致所采用的传统的枪管内、外边界条件均与实际情况有出入。针对此问题,本文引入两个修正系数,且采用非线性最小二乘法拟合了此修正系数与距枪口不同距离之间的关系式,分别对枪管内壁与火药气体之间的复合换热系数及枪管外壁与外界空气之间的复合换热系数进行修正。采用红外热像仪对枪管外壁瞬态温度场进行测试,测试结果分别与修正前后的模型所得的计算结果进行比较,修正后的模型准确可靠。采用修正后的模型对枪管温度场进行进一步的分析计算,得到了不同时刻枪管内、外壁温度沿枪管轴向分布规律。研究结果为深入研究枪管烧蚀机理、枪管结构设计和寿命预测提供了可靠的理论依据。
In the conventional analysis and numerical calculation of the temperature field of gun barrel,the effects of special structures such as barrel rifling,radiating ribs or fins,and the heat conduction between gun barrel and its adjacent parts were neglected,which difference of inner and outer boundary conditions for the calculation of gun barrel field.To this problem,two correction coefficients were introduced to modify the composite heat transfer coefficients between the propellant gas and inner wall and between the gun barrel outer surface and the ambient air.The two formulae of correction coefficients varying with the distance away from the gun muzzle were obtained by fitting with non-linear least square method.The test results of the temperature field of the gun barrel outer surface by thermal infrared imager were compared to the numerical calculation results by original and modified models,which demonstrated that the modified model was more accurate and reliable.The further analysis and numerical calculations of gun barrel temperature were conducted with the modified model,and the axial temperature distributions of both inner wall and the outer surface of gun barrel for some different fired rounds were obtained.The research results had great importance for the further studies of gun barrel erosion mechanism and provided the reliable theory basis for the structure design and the life prediction of gun barrel.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2017年第2期296-302,共7页
Journal of Engineering Thermophysics
基金
中国人民解放军总装备部瓶颈项目(No.30407)
关键词
修正系数
复合换热系数
枪管
枪管温度
枪管烧蚀
枪管寿命
correction coefficient
composite heat transfer
gun barrel
gun barrel temperature
gun barrel erosion
gun barrel life
