Five modifications of a standard 1D3D cyclone were tested and compared agai
nst the standard 1D3D design in the areas of particulate emissions and stat
ic pressure drop across the cyclone. The modifications to the 1D3D design i
ncluded a 2D2D inlet, a 2D2D air outlet, a D/3 trash exit, art expansion ch
amber with a D/3 trash exit and a tapered air outlet duct. The 1D3D modific
ations that exhibited a significant improvement in reducing both PM10 and t
otal suspended particulate (TSP) emissions were the designs with the 2D2D i
nlet and air exhaust combined with either the conical D/3 tail cone or the
expansion chamber. In reference to the standard 1D3D cyclone, the average r
eduction in PM10 emissions was 24 to 29% with a 29 to 35% reduction observe
d in TSP emissions. The modifications with the tapered air outlets did not
show any significant improvements in controlling PM10 emissions. However th
e modification with the tapered air outlet/expansion chamber combination ex
hibited statistical significance in reducing TSP emissions by 18% compared
to the 1D3D cyclone. All modifications tested exhibited lower static pressu
re drops than the standard 1D3D.