repeated flat tires..??

i have a 91 voyager 3.3 v6
i have had 3 flats in 2 weeks on the same front drivers side tire...what could be causing this? i dont see anything rubbing on the tire and i dont hear anything..just all of a sudden i'll get a flat..same spot the first one was when i hit the curb and busted the tire and dented the rim..i replaced that rim but i still got 2 more flats since then....any ideas?? thanks

It is possible that the rim you purchased is not sealing well causing the tire to leak down. Try removing the tire and cleaning the surface around the bead. If the rim is new you may end up replacing the tire as the sealing surface at the bead is probably damaged and will not seal properly.