how does turbo chef oven work and technology in it?
From a quick google: It looks to be a combination of 3 different technology, radiant heat, hot air and microwave.

From the turbo chef web site: Tubo Chef Bullet

"The Bullet oven uses radiant heat, high-speed air impingement, and side-launched microwave to cook food rapidly without compromising quality."

Air impingement seems to be high pressure, high temperature air jets: 

https://www.sciencedirect.com/topics/food-science/air-impingement

Video describing air impingement