a good possibility that the deflagration is initiated in an off-center way (e.g., Woosley et al. 2004, Kuhlen et al. 2006). In the pure-deflagration model, such an explosion cannot account for normal SNe Ia, because the small burning surface area should result in inefficient production of $^{56}$Ni (see, e.g., Röpke et al. 2007d). However, this can be possibly overcome in the delayed detonation scenario, as the detonation can potentially produce a large amount of $^{56}$Ni.

The paper is organized as follows. In §2, we present methods and models, in §3, we present our results. Discussion of these results from a view point of the chemical evolution is given in §4. The paper is closed in §5 with concluding remarks.

[ccccccc]{} $M_{\rm burn}$ & 1.21 & 0.61 & 1.01 & 1.25 & 0.522 & 0.393\
$E_{\rm nuc}$ & 1.78 & 0.91 & 1.46 & 1.80 & 0.767 & 0.522\
$E_{\rm K}$ & 1.28 & 0.41 & 0.96 & 1.30 & &\
$E_{\rm K}$ (hyd) & 1.30 & 0.41 & 0.93 & 1.27 & &

Methods and Models
==================

Explosion Models
----------------

In this paper, we concentrate on two-dimensional models. Although some results might be affected by the imposed symmetry (e.g., Travaglio 