Abstract Transporting hydrogen‐blended natural gas via existing pipelines is a viable large‐scale hydrogen delivery method. However, the high diffusivity of hydrogen increases the risk of dispersion after leakage. This study employed FLACS software to investigate the mitigation effects of baffle structures on leaked gas dispersion within a tunnel. The performance and mechanisms of sidewall baffle width, top baffle height, and their combinations were analyzed under varying hydrogen‐blending ratios. The results demonstrate that the combination of 20 cm sidewall baffles and 100 cm top baffles yields the optimal mitigation effect. For 5% hydrogen‐blended natural gas, compared to the no‐baffle scenario, suppression rates reached 67.52% at tunnel side walls and 42.85% at the centre. When hydrogen‐blending ratios increased to 15% and 25%, the maximum dispersion range increased by only 2.55% and 8.67%, respectively, relative to the 5% mixture. These findings demonstrate that the optimized baffle system provides robust and significant mitigation effects for natural gas with various hydrogen‐blending ratios in tunnel environments, effectively enhancing transportation safety.
Fan et al. (Wed,) studied this question.