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The backflow region length in sudden-reduction oil tube is not only closely associated with its energy loss, but
is also closely related to the partition between orifice plate and plug. In this paper, the characteristics of backflow region
length in sudden-reduction oil tube are researched. The results illustrated that backflow region length decreases with the
increase in the contraction ratio. Moreover, when Reynolds number is more than 105, Reynolds number has little impact
on backflow region length. Empirical expression about backflow region length in sudden-reduction oil tube is also
discussed in this paper.