CFD help

[teone]

Good morning, i am new to this forum.
I work for a company we do spare parts.
I am talking about injectors for diesel engines.

I shoud admit i don't have knoledge about CFD.



American customer sent us a table of common rail nozzles (bosch type DLLA ecc...)

One column of the table have a value "Cd" ... serching the web it shoud be "discharge coefficent" I tried to understand what it is but I am not able.

I send 3 lines from the table:

INJ. NOZZLE HOLES SPRAY HOLE DIAMETER FLOW Cd

*** ****** 7 0.195 1814 0.94
*** ****** 7 0.198 1879 0.94
*** ****** 7 0.163 1211 0.9


Flow is 100bar pressure value is in ml/min

HANY HELP WELLCOME

[Ivaylo Katev]

well, i can't see the relationship to phoenix, but as a good men will try to help you- the discharge coefficient measures the quality of the nozzle, the maximal possible value is 1, this is the coefficient of an ideal nozzle, coefficient 0.9 means that with the given nozzle you can reach 90% of the ideal nozzle flow.