Laminar burning velocity is currently one of the metrics for differentiating refrigerant flammability risk per ANSI/ASHRAE Standard 34-2019, Designation and Safety Classification of Refrigerants. Several methods exist for determining laminar burning velocity, and the HVAC&R industry is currently evaluating whether the constant-volume method (CVM) is appropriate for measuring the burning velocity of refrigerants. This study focuses specifically on the different data reduction techniques that can be applied to yield the laminar burning velocity from the pressure rise in CVM experiments. More specifically, simple analytical expressions and more complex numerical models are applied to estimate the mass fraction of burned gas from the pressure rise x(P), which is a requisite for determining burning velocity from the measure pressure. When following the experimental and post-processing recommendations outlined in this paper, one of the simpler methods of estimating x(P) yields R32/air burning velocities that are within 5% of those deduced using the more complex methods of estimating x(P). The method presented can be applied to experimental pressure rise data obtained in both normal gravity and microgravity.

根据ANSI / ASHRAE标准34-2019，制冷剂的指定和安全分类，层流燃烧速度目前是区分制冷剂易燃性风险的指标之一。存在几种确定层流燃烧速度的方法，并且HVAC＆R行业目前正在评估恒定体积法（CVM）是否适合测量制冷剂的燃烧速度。这项研究专门针对可用于通过CVM实验中的压力上升产生层流燃烧速度的不同数据减少技术。更具体地说，简单的分析表达式和更复杂的数值模型被用于根据压力上升x（P），这是根据测量压力确定燃烧速度的必要条件。遵循本文概述的实验和后处理建议时，一种简单的x（P）估计方法得出的R32 /空气燃烧速度在使用更复杂的x（P）估计方法得出的速度的5％之内。。提出的方法可以应用于在正常重力和微重力下获得的实验压力升高数据。