  In this contribution, velocity and its dissipation spectra in turbulent
non-premixed jet flames are investigated by using two Direct Numerical
Simulation (DNS) databases of temporally evolving jets with different bulk jet
Reynolds numbers. In the DNS differential diffusion and flame dynamics effects
have been accounted for and the flames experience high levels of extinction
followed by re-ignition. It turns out that the spectra extracted from different
statistically homogeneous planes across the jets and selected times
corresponding to various occurring flame regimes (extinction and re-ignition
phases) collapse reasonably when normalized by Favre averaged turbulent
quantities. Especially (1) in the inertial range, the $\kappa^{-5/3}$ power law
is observed with the constant of proportionality of $C_{K}=2.3$. (2) In the
dissipation range $\exp(\beta\kappa)$ scaling exists with $\beta=7.2$ (instead
of $\beta=5.2$). (3) The location of the peak of the normalized 1D dissipation
spectra is in a lower normalized waver number ($\approx 0.08$) compared to the
peak of non-reactive model spectrum ($\approx 0.11$). (4) Finally, an adapted
3D dissipation model spectrum proposed which peaks at a normalized waver number
$\approx 0.19$ (instead of $\approx 0.26$).
