A DC9-50 ON TKOF CLB DECLARED AN EMER AND DIVERTED DUE TO #2 ENG STALLING AND LOSS OF PWR.

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ON TKOF ROLL AT CRP; 10 KTS PRIOR TO V1; ACFT EXPERIENCED 3 LOUD BANGS. NO LOSS IN ENG PWR WAS OBSERVED. ACFT DEPARTED AND LIFTED OFF IN WHAT MIGHT HAVE BEEN SOME LOSS IN PWR. ACFT WAS 'CLEANED UP' AND PWR REDUCED. ALL SYS INST APPEARED NORMAL; HOWEVER; ENGS SOUNDED VERY LOUD; A 'WHINEY' SOUND. FLT ATTENDANTS CONFIRMED ENG NOISE AND BELIEVED WE BLEW OUT TIRES ON OUR TKOF ROLL. ADDITIONALLY; THE FORWARD CARGO DOOR LIGHT WAS ON. A COCKPIT JUMP SEAT RIDER WHO WAS IN THE PAX CABIN WAS BROUGHT ONTO THE FLT DECK TO ASSIST. HE WAS NOT SURE IF WE HAD ENG AND/OR TIRE PROBS. AN EMER WAS DECLARED AND BEGAN VECTORS FOR AN ILS BACK TO CRP. WE WERE NOT SURE IF WE HAD HAD 1) CARGO WHICH EFFECTED THE ENGS; 2) BLOWN TIES WHICH FOD'ED THE ENGS; OR 3) STRAIGHT ENE PROBS. WE ORDERED A RWY INSPECTION FOR CONTAMINATION CHK. ACFT WAS PRESSURIZING WHICH ELIMINATED THE CARGO LIGHT PROB. ON FINAL APCH; RWY WAS STILL BEING INSPECTED. A GAR WAS PERFORMED AND ENG'S COMPRESSOR STALLED ABOUT 3 TIMES. PWR WAS REDUCED AND ENGS STABILIZED. THERE WAS NO DEBRIS FOUND ON RWY AND ANOTHER APCH AND LNDG WAS PERFORMED. THE #2 ENG SUSTAINED SIGNIFICANT FAN BLADE DAMAGE NECESSITATING AN ENG CHANGE. NO INJURIES RPTED. ONLY DAMAGE WAS TO #2 ENG. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE FAN BLADES WERE EXTENSIVELY DAMAGED AND REQUIRED AN ENG CHANGE. THE RPTR SAID IT APPEARED TO BE FOD; BUT MAINT HAS NOT ADVISED THEIR FINDINGS.