Flight Crew Air Transport Pilot (ATP)
Inflight Event / Encounter Wake Vortex Encounter
General None Reported / Taken
Environment - Non Weather Related; Procedure
DescriptionWhile on visual approach to 36L at CLT; just after glideslope intercept at CANUK (4000 feet) aircraft encountered wake turbulence from the preceding aircraft approximately 3-4 miles ahead of us.  ATC had just assigned a speed of 160KIAS and we were decelerating through 170KIAS.  Airspeed was 165-170KIAS during the event with flaps at 20 degrees.  The aircraft rapidly rolled to the left; right; left; right.  Or; it may have been right; left; right; left.  The autopilot kicked off and the stall warbler briefly sounded.  As quickly as it started; it ended; and the aircraft automatically returned to stable flight.  The entire event may have lasted 2-4 seconds.  Airspeed remained 165-170KIAS.  IdentificationThe rolling.The autopilot disconnecting.The stall warbler sounding.CauseWake turbulence encounter from preceding aircraft.  My guess is that buffeting; swirling winds from the wake vortices briefly buffeted the aircraft and the AOA sensors just enough to set off the stall warning system.  ResponseThe aircraft quickly returned to stable flight.  The event ended so quickly that we were still on the glideslope with no perceived loss of altitude or heading.  We resumed the approach and landing with no further incident.  Just to make sure though; the remainder of the approach was flown approximately 1 dot high and slightly upwind of the centerline.  We queried ATC (approach) on the type of preceding aircraft and were told that it was an Airbus 321.  SuggestionsBetter separation from A-321 aircraft.
CRJ-200 Captain reported wake turbulence in trail of an A321 on a visual approach to CLT.