The present master’s Thesis was carried out in a collaboration between the Polytechnic of Turin and Ethos Energy Spa, both located in Turin, TO, Italy. The current state of power generation through natural gas cannot be abandoned or replaced without significant investment. This study arises from the need for redesigning a natural gas injector into one compliant with hydrogen-natural gas blends. Since the Paris Agreement of 2016, hydrogen has become of interest as an alternative fuel. Due to its efficient and clean combustion, hydrogen can be considered a valuable energy carrier in power generation. Considering the world's tendency to reduce emissions, the study is focused on NOx generation.