Premixing burner

A premixing burner comprising:

• two hollow conical partial bodies disposed to form a conical burner interior having a flow direction respective longitudinal center lines of the bodies being offset relative to one another to form longitudinally extending gaps for a tangential flow of combustion air into the interior, gas inlet openings being distributed in the longitudinal direction in the region of the tangential gaps in walls of the two partial bodies;
• and
• a plurality of vortex generators disposed on the walls of the partial bodies in the gaps and arranged adjacent to one another without intermediate spaces over the width or the periphery of the gap through which flow occurs, each vortex generator having three surfaces around which flow takes place freely, the surfaces extending in the flow direction, and forming a top surface and two side surfaces, the side surfaces each abutting a wall and enclosing a V-angle between them, a top surface edge extending transversely to the inlet gap through which flow occurs being in contact with the same gap wall as the side walls, and longitudinally directed edges of the top surface which abut longitudinally directed edges of the side surfaces protruding into the flow gap extending into the gap at an angle to the gap wall, a height of the vortex generators being at least 50% of a height of the gap through which flow occurs,
• wherein fuel is introduced into the gaps in the immediate region of the vortex generators.