CIR/ACME (Combustion Integration Rack/Advanced Combustion via Microgravity Experiments): In support of the continuing s-Flame investigation, the crew exchanged the ACME Bypass Controller and the ACME Fuel Controller.  These controllers allow different flow regimes to be used for the experiment.  The purpose of s-Flame is to advance our ability to predict the structure and dynamics, including …

Source: ISS Daily Summary Report - 12/24/2019