Investigation of of the Hydrogen Increament to Natural Gas on Combustion Characteristics: Numerical Simulation

علوم کاربردی و محاسباتی در مکانیک

Articles in Press, Accepted Manuscript, Available Online from 13 September 2025   

Document Type: Original Article

DOI: 10.22067/jacsm.2025.94099.1338

Authors

Ebrahim Afshari^{* 1}; Mahdiye Haratin Aval¹; Nabi Jahantigh²

¹University of Isfahan

²University of Zabol

Abstract

Injecting green hydrogen into natural gas is considered a renewable energy storage method. It is a cost-effective option for providing heat and electricity to residential and commercial sectors while reducing the carbon content of natural gas networks. By injecting less than 10% hydrogen into natural gas, there is no need to change the combustion infrastructure. The aim of this study is to investigate hydrogen injection into the urban gas transmission network by numerically simulating the combustion chamber of a natural gas and hydrogen mixture and finding the appropriate natural gas/hydrogen ratio by examining the combustion characteristics. The conservation equations of mass, momentum, energy and chemical components have been solved numerically. The results show that adding hydrogen increases the temperature and flame elongation, reduces carbon dioxide emission, increases water and the amount of NOx produced. In the case of 2.5% hydrogen, the heat of reaction is reduced compared to pure methane, but gradually and with increasing hydrogen percentage, the heat of reaction increases.

Keywords

Numerical Simulation; Mixed Fuel; Hydrogen; Natural Gas; Produced NOx; Combustion Chamber

References