The cold-state dynamic field of a new-type low NOx swirl burner has been obtained through combination of FLUENT cold-state simulation with cold-state test.After analysis of axial velocity

air flow range

reverse flow area

and jet flow boundary etc.

the results obtained are as follows:under condition of the secondary air straight flow velocity v=20 m/s

the attenuation of axial velocity is gentle

and the jet range being the longest

the area of reverse flow being the largest

the length of reverse flow being the longest and narrowest

but the expansion angle is comparatively small

the flame isn't easily to stick onto the wall

and slagging isn't easily to occur.At the same time

the empirical formulae for attenuation of axial velocity and for boundary of jet flow in the new type low NOx swirl burner have been given.