A　two-zone　quasi-dimensional　model　is　developed　and　validated　for　predicting　the　performance　of　a　hydrogen-enriched　methanol　engine.　The　fractal-based　turbulent　entrainment　model　was　applied　to　hydrogen-enriched　methanol　combustion　simulations　with　a　laminar　flame　speed　correlation　of　hydrogen-methanol-air　mixtures.　The　model　accuracy　was　evaluated　under　different　hydrogen　volume　fractions,　equivalence　ratios,　loads　and　speeds.　Satisfying　agreement　between　numerical　and　experimental　results　was　achieved.　The　validated　model　was　applied　to　investigate　the　flame　propagation　speed,　exhaust　loss　and　brake　thermal　efficiency　of　hydrogen-enriched　methanol　engines.　The　results　showed　that　the　hydrogen　enrichment　could　improve　the　flame　propagation　speed,　reduce　the　exhaust　loss　and　enhance　brake　thermal　efficiency.　Moreover,　the　results　suggested　that,　for　the　actual　vehicular　engine　operation,　the　hydrogen　addition　should　be　coupled　with　the　lean　burn　strategy　under　low　speed　and　part　load　conditions.　(C)　2016　Hydrogen　Energy　Publications　LLC.　Published　by　Elsevier　Ltd.　All　rights　reserved.