NOVELTY - A reformer (100) comprises a housing (10) having an inner surface (14), an outer surface (12), and an inlet (26); an ignition housing (16) with an inner surface (20), an outer surface (18), and a turbulent flow generator (28) bordering a portion of an opening (30); a chamber (24) defined by the housing inner surface and the ignition housing outer surface in fluid communication with inlet and opening; and catalytic substrate (22). The ignition housing is disposed in housing.    USE - For processing fuels (claimed) in system such as solid oxide fuel cell (SOFC) system, proton exchange membrane, and proton exchange membrane (PEM) system where hydrocarbon fuel e.g. methane, propane, natural gas, gasoline and diesel to hydrogen or to less complex hydrocarbon.    ADVANTAGE - The turbulent flow generator allows better mixing in the mixing zone of the reformer compared to designs without turbulent flow generators. The length of the mixing chamber can be reduced compared to traditional reformer designs. Thus reformer achieves better mixing in a smaller volume compared to reformer designs without turbulent flow generator. The improved mixing of fuel with an oxidant allows a more controlled combustion and/or reaction within the reformer, thus avoiding thermal aging or instability of the reformer, which can damage the catalyst, catalyst support material(s), and/or substrate(s) of the reformer. This extends the useful life of the reformer. The controlled combustion can be accomplished with or without the use of a flame arrestor over the face of the substrate. The reformer does not employ a flame arrestor, thus decreasing time to reaching operating temperatures compared to reformers employing a flame arrestor. The reformer achieves a greater than or equal to80 (preferably greater than or equal to 90) % of mixing of fluid stream with the fuel.    DETAILED DESCRIPTION - The catalytic substrate is disposed within the ignition housing in fluid communication with the opening. An INDEPENDENT CLAIM is included for making the reformer.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of the reformer.    housing (10)    housing outer surface (12)    housing inner surface (14)    ignition housing (16)    ignition housing outer surface (18)    ignition housing inner surface (20)    catalytic substrate (22)    chamber (24)    inlet (26)    opening. (30)