WEST LAFAYETTE—Robbie Hummel scored 21 points to help Purdue defeat Northern Illinois 96-34 Friday night in the season opener for both teams.It was Hummel’s first regular-season game since he tore the ACL in his right knee in February 2010. He made 5 of 7 3-pointers in 20 minutes as Purdue rolled to the third-largest margin of victory in school history and the largest since 1911. It also was Purdue’s 18th straight home win.Purdue rededicated Mackey Arena during the first regular-season game since the facility was updated as part of a $100 million renovation project. It also was the first game on the new floor, which was replaced after flooding during the offseason.Purdue forced 28 turnovers and held the Huskies to 25 percent shooting.Tim Toler scored 11 points for NIU in coach Mark Montgomery’s debut at the school.