Effect of Argon Concentration on Laminar Burning Velocity and Flame Speed of Hydrogen Mixtures in a Constant Volume Combustion Chamber

Abstract

Hydrogen combustion, coupled with the use of argon as a working fluid, is a promising approach to delivering clean and efficient energy from internal combustion engines. The use of hydrogen-oxygen-argon (H2/O2/Ar) mixtures in combustion aids in mitigating harmful environmental pollutants and enables a highly efficient energy conversion process. The use of argon as a working fluid decreases the NOx emissions and increases the thermal efficiency of internal combustion engines due to the high specific heat ratio of noble gases. In this study, premixed hydrogen combustion was investigated with the purpose of examining the effect of the full or partial substitution of argon for nitrogen in air on laminar burning velocity, flame speed, flame morphological structure, and instability. The experimental approach uses an optically-accessible constant volume combustion chamber (CVCC) with central ignition; the spherical flame development was studied using a high-speed Z-type Schlieren visualization system. Moreover, a numerical model was developed to convert the experimental dynamic pressure rise data to laminar burning velocity. Coupling the model to a chemical equilibrium code aids in determining the burned gas properties. Additionally, an image processing technique has been suggested to compute the flame propagation speed. The experimental and numerical investigations indicate that increasing the concentration of argon as the working fluid in the mixture increases the laminar burning velocity and flame speed while extending the lean flammability limit.

Effects of inert-gas addition on the dynamic behavior and propagation characteristics of spherically expanding hydrogen-air flames

“…To mitigate the influence of hydrogen explosion, the addition of inert gas is well-known to be one of possible approaches. We have several reports which experimentally studied the effects of inert-gas addition on the combustion characteristics of hydrogen premixtures (Qiao et al, 2007;Bane et al, 2011;Zhang et al, 2012;Cheikhravat et al, 2015;Duan and Liu, 2017;Li et al, 2018;Li et al, 2019;Yan et al, 2020;Gong et al, 2020;Katsumi et al, 2021;Morovatiyan, et al, 2021). The addition of inert gas has the effects of decreasing the burning velocity and reducing the maximum pressure in explosion.…”

A Study on Temperature and Pressure Characteristics in a Vessel as Charging Time of Helium Gas Changes

“…Particularly, regarding the measurement technology that uses helium gas, it is necessary to verify the expanding pressure characteristics, including particle mass fraction [2]. These physical changes can be seen in a hydrogen storage vessel, chamber, or tank that includes volume [3]. As much as hydrogen gas, helium gas is classified as an energy source that involves both input and output processes [4].…”

An Analytical Investigation of Magnetic Variable Valve Timing System in Internal Combustion Engines

“…Internal combustion engines are optimally designed for efficiency and performance [1]. Various zero dimension kinetic and computational fluid dynamics (CFD) models have been developed to maximize the efficiency and minimize the air prolusion of these engines [2,3].…”