助燃条件下硼粉燃烧热测试不确定度分析

为提高硼粉燃烧热值测试的准确性,确定助燃条件下影响硼粉燃烧热值测量不确定度的主要因素,依据硼粉的点火、燃烧特性以及助燃条件下硼粉热值测试原理,采用直接评定法分析了影响硼粉燃烧热值测试的不确定度,进行了硼粉的燃烧热值测试。计算了各因素对硼粉燃烧热测试值不确定度的影响程度。结果表明:影响硼粉燃烧热测试不确定度的主要因素是量热体系的温升、助燃剂的热值、参与燃烧的硼粉的质量,降低系统热容量的不确定度可提高硼粉燃烧热值测量的准确度。助燃条件下测试硼粉燃烧热值的相对不确定度仅为0.95%。

Uncertainty Analysis of Combustion Heat Test for Boron Powder Under Combustion-supporting Condition

In order to improve the accuracy of the test for boron powders combustion heat and determine the main factors affecting the uncertainty of boron powders combustion heat test under the combustion-supporting condition,the direct assessment method was adopted to analyze the uncertainty based on boron powders ignition and combustion characteristics as well as the principle of boron powders combustion heat test under the combustion-supporting condition. The impact degree of various factors on uncertainty of boron powders combustion heat value testing were calculated. Results show that the main factors affecting the uncertainty for boron powders combustion heat test are the temperature rise of the calorimetric system,the calorific value of combustion-supporting agent,and the mass of boron powders involved in the combustion. Reducing the uncertainty of calorific capacity of the calorimetric system,can increase the accuracy of measurement for boron powders combustion heat value. The relative uncertainty of boron powders combustion heat value test using combustion-supporting agent is only 0.95%.