scope:

The AIAA GTTC Dual Flow Reference Nozzle Working Group developed recommended practices and aerodynamic definition for two types of reference nozzles used to verify the correct operation of thrust rigs measuring subscale exhaust nozzle system performance. The two nozzles defined are: Dual separate Flow Reference (DSFR) and Dual Mixed Flow Reference (DMFR). The recommended specification focus on defining reference nozzle aerodynamic loft lines (aero-lines) and features including flow conditioning, instrumentation, operational procedures, and data reduction procedures.

The intention of the work undertaken by the working group ha been to collect the best practices in use within the sub-scale testing community to develop an agreed upon approach for the topics outlined above. It is hoped that the adoption of these recommended practices will lead to a consistent method that approaches a standard type basis for assessing the status of testing rig functionality. The term "Standard" and its use within this document is meant to defines the method agreed upon by the working group.