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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 past in the analysis and calculation of the barrel temperature field, are ignored the barrel rifling, cooling grooves and other special structure and the barrel on the contact with the parts of the heat transfer on the barrel temperature field, resulting in the use of the traditional Barrel, the outer boundary conditions are different from the actual situation. In order to solve this problem, two correction coefficients are introduced in this paper, and the relationship between the correction coefficient and different distance from the muzzle is fitted by nonlinear least square method. The heat transfer between the barrel wall and gunpowder gas Coefficient and the outer wall of the barrel and the outside air compound heat transfer coefficient be amended. The infrared temperature camera was used to test the transient temperature field of the barrel outer wall. The test results were compared with those obtained before and after modification respectively. The corrected model was accurate and reliable. The modified model was used to further analyze and calculate the temperature field of the barrel. The distribution of the temperature inside and outside the barrel along the barrel was obtained at different times. The results provide a reliable theoretical basis for further research on barrel ablation mechanism, barrel structure design and life prediction.