The cyclone leading to precipitation and flooding in the United Kingdom on 1 February 2002 is a secondary cyclone
(labeled "2") forming on the trailing cold front of a preexisting primary cyclone (labeled "1").
The gas leaving the combustor passes by the primary and secondary cyclones
, a flue gas distributor and a coaxial conduit leading to the gas turbine.
However, if the cyclone is operating with a high of secondary cyclones
separating middlings and refuse, this ratio may be as high as 8:1.