AN A320 CREW RPTS SEVERAL ACOUSTIC LINER PANELS AFT OF ENG FAN CAME OFF AND BLOCKED NORMAL AIR FLOW DURING TKOF. AN EMER WAS DECLARED WITH RETURN TO LNDG.

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DEPARTING ZZZ FO WAS PF AND CAPT WAS PNF. DEP RWY 30; FLAPS 2 DEGS AT REDUCED PWR. ACFT GROSS WT WAS APPROX 160000 LBS. TKOF CLRNC WAS L TURN 230 DEG CLB TO 3000 FT MSL. TKOF WAS NORMAL WITH L TURN TO 230 DEGS. PASSING 1200-1400 FT MSL; WE HEARD VERY LOUD AIRFLOW TYPE NOISE. MY INITIAL THOUGHT WAS THAT WE HAD A GEAR DOOR PROB. TOOK QUICK SCAN AT GEAR INDICATOR AND ENG SCREEN BUT NO IRREGULAR INDICATIONS. ABOUT THAT TIME WE HEARD A LOUD POPPING NOISE; BUT WE HAD NO ASSOCIATED YAW OR AIRFRAME VIBRATION. WE DECIDED TO BRING #1 ENG TO IDLE TO CLR POPPING NOISE; THINKING WE HAD A POSSIBLE COMPRESSOR STALL. WITH ENG AT IDLE PWR ALL ABNORMAL NOISES STOPPED. AT THIS TIME WE NOW HAD AN EPR MODE FAILURE ECAM. CAPT PERFORMED ECAM PROCS AND SAID WE COULD ATTEMPT TO ADD PWR ON #1 ENG. AS THIS WAS GOING ON WE CONTINUE CLB TO 3000 FT AND STARTED NBOUND TURN TO SET UP FOR ILS RWY 19R AT ZZZ. WHEN WE ATTEMPTED TO ADD PWR ON #1 ENG NOISE/POPPING RETURNED SO WE PULLED ENG BACK TO IDLE. ENG INDICATIONS ON SCREENS NEVER SHOWED ANY SIGNIFICANT ABNORMAL INDICATIONS THROUGHOUT ENTIRE ABNORMAL OP. CAPT AND FO DECIDED TO OPERATE ENG AT IDLE THROUGH LNDG UNLESS WE GOT ANOTHER INDICATION THAT WOULD MAKE US WANT TO SHUT ENG DOWN. WE CONTINUED NBOUND UNTIL CAPT HAD COMPLETED CHKLISTS AND COORD WITH CABIN CREW AND DISPATCH. REQUESTED A BASE TURN FROM APCH WHEN CAPT SAID HE WAS READY. APCH VECTORED US TO JOIN RWY 19R ILS AT 3000 FT MSL. STARTED TO CONFIGURE ONCE GS CAME ALIVE. LET AUTOPLT FLY ACFT WHILE I MANUALLY CTLED THRUST. DISCONNECTED AUTOPLT AT APPROX 200-300 FT AGL. NORMAL LNDG AND ROLLOUT ON RWY 19R. AFTER CLRING RWY 19R WE STOPPED ACFT; SHUT DOWN #1; AND ALLOWED FIRE CREW TO INSPECT ENG AND BRAKES. AFTER GETTING ALL CLR FROM FIRE CREW WE TAXIED TO RAMP. ABOUT 50 YARDS SHORT OF GATE FIRE CREW TOLD US THEY SAW RESIDUAL SMOKE FROM #1 ENG. WE STOPPED ONCE AGAIN AND ALLOWED THEM TO RE-INSPECT ENG AS THEY WERE ESCORTING US TO GATE. ONCE GIVEN THE ALL CLR AGAIN WE HAD MAINT TOW US INTO GATE. SUPPLEMENTAL INFO FROM ACN 743855: THE APPARENT CAUSE OF THE ENG FAILURE WAS VISIBLY EVIDENT. SEVERAL OF THE ACOUSTIC LINER PANELS AFT OF THE MAIN ENG FAN HAD COME OFF AND BLOCKED NORMAL AIRFLOW FROM THE FAN.