To address concentration stratification during pipeline transportation of hydrogen?blended natural gas and improve mixing efficiency over short distances, a multicomponent turbulent?flow model was established using computational fluid dynamics. The mixing characteristics, flow?field evolution, and pressure loss of three spiral static mixer structures?right?handed blades, crossed blades, and crossed perforated blades were compared. The coefficient of variation and mixing uniformity were used as quantitative indicators for comprehensive evaluation. The results show that the crossed perforated?blade structure satisfies industrial mixing requirements (uniformity≥95%) within 2 m through the synergistic effects of swirl, jet flow, and secondary flow. The mixing uniformity reaches 99.66% at 5 m, with a concentration?mixing influence factor of 9.14 and a pressure loss of 189.3 Pa. It is concluded that the synergy among swirl, jet flow, and secondary flow is the core mechanism for achieving efficient short?distance mixing. The crossed perforated?blade structure significantly improves mixing efficiency while maintaining low?loss transportation. The findings provide a reference for the selection of static mixer structures.