To reduce live fire test and evaluation costs sub component testing is typically performed. Critical to fire testing is the need to ensure a proper airflow environment.
Since live fire testing is performed at full scale and the sources for external air flow are limited there is a need to properly place the component under test to obtain the desired flow conditions. To demonstrate the need for reliable placement the test article location was computationally examined by ESI.
To demonstrate the need for reliable placement the test article location was computationally examined by ESI.
This was initiated by first measuring the velocity field exiting the high speed air supply duct. Based on the results of the measured flow field a refined computational mesh of the duct was configured. This mesh consisted of 275,000 elements.
Once the computed flow field was determined to represent this existing duct flow a generic wing was inserted downstream of the duct and the flow field around the wing computed.
From the computation it became apparent the velocity field around an airfoil, when placed on the duct centerline was biased.
Vertically offsetting this generic wing a significant distance allowed an approximately uniform flow field to be achieved.
Two cases are presented to demonstrate the placement effect.