Experimental investigation of dynamic hydrogen jet flame behavior and key parameters within an enclosed compartment
A series of experiments were conducted in an enclosed compartment to analyze the flame characteristics of dynamically released hydrogen jet flames.These experiments investigated the flame shape,height,oxygen volume fraction,centerline temperature above the flame,and sidewall gas temperature.A camera was utilized for capturing the flame's morphology,while oxygen volume fraction sensors and thermocouples were deployed to precisely measure the oxygen concentration and temperature at defined locations within the compartment.The experimental findings reveal two distinct patterns in the evolution process of hydrogen jet flames within the compartment:hydrogen-controlled jet flames and oxygen-controlled hydrogen jet flames.The evolution of hydrogen-controlled jet flames can be delineated into four stages:growth,decay,rise,and extinction.Meanwhile,oxygen-controlled hydrogen jet flames exhibit three distinct stages:growth,decay,and self-extinguishing.The declining trends of oxygen volume fraction differ significantly between the two types of hydrogen jet flames.In hydrogen-controlled jet flames,there is an approximate linear decrease in oxygen volume fraction,followed by a gradual decline.However,in oxygen-controlled hydrogen jet flames,there is an approximate linear decrease in oxygen volume fraction.Additionally,the minimum average oxygen volume fraction for both types of flames exhibits a linear decrease with jet pressure.While the overall temperature profiles above the flame centerline and near the sidewall exhibit similar trends,significant interruptions are observed during the temperature decrease process in the oxygen-controlled jet flame.The injection pressure exerts a notable influence on the maximum temperature increase induced by the hydrogen jet flame within the enclosed compartment.Leveraging the experimental conditions,a predictive model for the maximum temperature rise above the flame's centerline within the compartment was established.
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