This study is attempted to establish a prediction model of turbulent burning velocity for hydrogen mixtures as a reference of the mean local burning velocity S_L estimated by taking account of the preferential diffusion effect, instead of the laminar burning velocity S_<L0>. The S_L is estimated for the specific mixtures having the same S_<L0> by adding nitrogen to hydrogen-air mixtures, where S_<L0> as well as the equivalence ratio are varied extensively, in order to confirm the effect of u'/S_<L0> on S_L. It is found that accuracy of the proposed simple mode can be improved by using S_L with respect to u'/S_<L0>.
