Identification of a purple flower
It closely looks like Tibouchina urvilleana* or any other Tibouchina species. You can have a look here.



[Source:Wikimedia common]


  Tibouchina urvilleana is a species of flowering plant in the family Melastomataceae, native to Brazil. Growing to 3–6 m (10–20 ft) tall by 2–3 m (7–10 ft) wide, it is a sprawling evergreen shrub with longitudinally veined, dark green hairy leaves. Clusters of brilliant purple flowers up to 10 cm (4 in) in diameter, with black stamens, are borne throughout summer and autumn.[Source]


*Credits to @RHA for suggesting the right species.