  In this paper we present some results of numerical simulations concerning the
development of galactic winds in starburst galaxies. In particular, we focus on
a galaxy similar to IZw18, the most metal-poor galaxy locally known. We compute
the chemio-dynamical evolution of this galaxy, considering the energetic input
and the chemical yields originating from Supernovae (SNe) of Type II and Ia and
from intermediate-mass stars. We consider both single, instantaneous starburst
and two starbursts separated by a quiescent period. In all considered cases a
metal enriched winds develops and in particular the metals produced by Type Ia
SNe are ejected more efficiently than the other metals. We suggest that two
burst of star formation, the first being weaker and the last having an age of
some tenth of Myr, can satisfactorily reproduce the abundances and abundance
ratios found in literature for IZw18
