The discussion revolves around understanding the notation and specifications related to turbine performance, specifically focusing on terms like GT12, 72 Trim, and 0.39 A/R. The context includes a post-graduate project involving turbine performance maps and data related to aircraft environmental control systems.
Participants do not reach a consensus on the meaning of "72 trim," and there is uncertainty regarding the ability to generate a performance curve without standard data. Multiple viewpoints and questions remain unresolved.
There is a lack of standard data noted at STP conditions, and the discussion includes references to external resources for clarification, which may not fully address the participants' questions.
Thanks a lot.. but what is 72 trim ?zAbso said: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.
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.zAbso said:http://turbobygarrett.com/turbobygarrett/wheel_trim
This should explain what trim is, I only briefly read over it but it should help.