The use of hydrogen as fuel in gas turbines is currently seen as a promising new technique for the production of clean, sustainable energy. To run entirely on hydrogen fuel, the geometry of a conventional CAN combustor is required to change and numerically tested. This study is in the same direction as other numerous studies that have been conducted on the decrease of NOx by hydrogen microjet combustion. Micro-mix combustion principle based on fuel jet-in-crossflow air (JICF) is utilized for mixing of hydrogen and air. Fuel is injected perpendicularly to an air flow. The purpose of this numerical simulation is to evaluate the impact of a hydrogen supply with varying momentum flux ratios and combustor emission characteristics. The momentum ratio is varied by changing the air inlet area and keeping fuel velocity constant. In order to meet the demands of high combustion efficiency, low emissions and improved pattern factor at the combustor’s outlet section, parametric study is carried out by changing the momentum ratio. The result shows that the increase in momentum ratio results in the stronger inner recirculation zone. For momentum flux ratios 1, 2 & 3 the main heat release zone is in the secondary zone while at 4 & 5 the main heat release zone is shifted to the dilution zone towards the outlet of the combustor. The optimum combustion efficiency of 55% was observed with a higher momentum ratio of 4. When momentum ratio increases, pattern factor decreases, and NOx emission increases at the outlet. At momentum flux ratio 4, NOx production is 1.71 ppm, while NOx emission with 15% O2 is 0.69 ppm. J = 4 momentum flux ratios outperform with little compromise in NOx emissions.