Here is a simple but very effective gasifier running a generator. The gasifier would appear to use a forced-draught as air input as there is a blower rather than a sucker.
The wood gas is taken from directly above the pyrolysis layer so it would make this an updraught gasifier rather than a downdraught gasifier, which takes gas from below the pyrolysis layer.
Normally, an updraught gasifier is not to be recommended but the use of charcoal rather than wood makes for a cleaner gas. Looking at the flame in the combustion chamber, there is certainly a blue flame there.
Later in the video, we see the wood gas being successfully ignited.
It is good to see such a simple but effective gasifier in operation.