「顺风顺水」英文怎么说？

on a roll 

好运连连，顺风顺水，鸿运当头

Don't stop me now, I'm on a roll. 

现在别阻止我，我正在鸿运当头呢 ！

He won two games in a row. It's obvious he was on a roll. 

他连赢了两盘游戏，很明显他的运气还不错。