不同气压音速射流氢气火焰温度与辐射

Experimental investigation on the temperature field and radiation feedback of sonic hydrogen jet flames under different pressure conditions

为分析不同气压条件下氢气射流火焰的危险性并提出预防措施建议,在0.06 MPa和0.10 MPa条件下进行音速射流氢气火焰的热特性实验研究。采用内径1.0 mm的焊枪作为喷嘴,研究火焰热特性对压力和质量流量的依赖关系。16个热电偶沿火焰轴向排成两排,2个辐射计设置在喷嘴上部和下部,分别用于记录温度场和辐射反馈。结果表明,近距离区域内0.10 MPa时上部和下部热电偶温度高于0.06 MPa,而远距离区域则处于相反状态。低气压条件下分隔间距应设计得更宽。0.10 MPa时上部和下部辐射反馈数值都大于0.06 MPa。建议低海拔区域需采用具有更强耐热性的输气管道。

In order to analyze the danger of hydrogen gas jet flame under different pressure conditions and propose preventive measures,an experimental study on thermal properties of hydrogen jet flames was performed under 0.06 MPa and 0.10 MPa.The injector was welding torch with internal diameter of 1.0 mm,and the relations between thermal features of flame and pressure or mass flow rate were studied.Sixteen thermocouples arranged in two rows along the flame axis and two radiometers set up and down to the nozzle were used to record temperature field and radiation feedback respectively.It was found that the temperatures of the near region of both upper and lower points under 0.10 MPa were higher than those under 0.06 MPa while the far region had the opposite state.The separation distance should be wider under low pressure.All values of the upper and lower radiometers under 0.10 MPa were larger than those under 0.06 MPa.It was suggested that the gas pipeline with stronger heat resistance should be adopted in the low altitude area.