Turbine performance: understanding notation

[Rahul Mohan P]

Hi Guys. This is for my post graduation project. I came across a turbine performance map where the turbine specs are mentioned as GT12, 72 Trim, 0.39 A/R. Now what exactly these terms means. Please help.

 

[zAbso]

GT12 is the model (Galvanized Turbine), 0.39 Area/Radius
http://turbobygarrett.com/turbobygarrett/turbine_housing_AR_and_housing_sizing

I have family that works for a manufacturer, maybe this link will help you if I'm thinking of the right thing.

 

[Rahul Mohan P]

GT12 is the model (Galvanized Turbine), 0.39 Area/Radius
http://turbobygarrett.com/turbobygarrett/turbine_housing_AR_and_housing_sizing

I have family that works for a manufacturer, maybe this link will help you if I'm thinking of the right thing.

Thanks a lot.. but what is 72 trim ?

 

[zAbso]

http://turbobygarrett.com/turbobygarrett/wheel_trim

This should explain what trim is, I only briefly read over it but it should help.

 

[Rahul Mohan P]

http://turbobygarrett.com/turbobygarrett/wheel_trim

This should explain what trim is, I only briefly read over it but it should help.

Thank You. I have data for a two wheel bootstarp air cycle machine used in aircraft environmental control system for air-conditioning under working conditions. The data is for different flight conditions, different temperature and pressure. I want generate corrected mass flow rate vs pressure ratio curve of the turbine used in the system. I don't have the standard data noted at STP (standard pressure and temperature) conditions, and no manufacture provided performance curve, but can I generate a curve using the available values which is not taken under STP conditions.