热沉定值系统不确定度评定

热沉是表征吸热型碳氢燃料吸热能力的特性参数,准确高效地计量热沉是吸热型碳氢燃料在高超声速飞行器中工程应用的前提和关键技术。根据功能模块划分设计理念,研建了一套高精度、集成自动化的热沉定值系统。在此基础上,依据JJF 1059《测量不确定度评定与表示》的相关规定,分析了热沉定值系统的不确定度主要分量并进行了不确定度评定。结果表明,热沉定值系统的扩展不确定度为2.48%(k=2)。热沉定值系统的建立不仅为吸热型碳氢燃料的吸热能力提供了计量保障,而且也为后续热沉标准物质的研制奠定了基础。

The Evaluation of Uncertainty of Valuing System for Heat Sink

Heat sink is the characteristic parameter weighing the heat absorption capacity of endothermic hydrocarbon fuels (EHFs). Measuring the heat sink with high efficiency and accuracy is the premise and key technology for the engineering application of EHFs to hypersonic aerocrafts. A high accurate and automated valuing system for heat sink was developed according to the functional modularity design philosophy. On this basis, main uncertainty contributions were analyzed and then the uncertainty of the valuing system for heat sink was evaluated referring to JJF1059 Evaluation and Expression of Uncertainty in Measurement. The results showed that the expanded uncertainty of the valuing system is 2.48% (k=2). The valuing system for heat sink provides a strong support to the metering of the heat absorption capacity of EHFs as well as a basis for the subsequent development of the reference material of heat sink.