What is the De Laval nozzle and how is it used in supersonic expansion?

[minchitthumg]

i am mechanical engineering students.
i need help in design and construction of supersonic expansion nozzle.
Please share me your Knowledge and Experience of supersonic expansion nozzle and technical hand books.

 

[Claws]

You'll want to look up De Laval nozzle for starters, here's the wiki link:
http://en.wikipedia.org/wiki/De_Laval_nozzle