In the variable temperature cryogenic mode, nitrogen is the test gas. Liquid nitrogen is sprayed into the circuit. The heat of vaporization and latent heat cools the tunnel structure while removing the fan heat. In this mode, the NTF tunnel provides full-scale flight Reynolds numbers without an increase in model size. In the ambient temperature air mode, air is the test gas.
Water flows through the cooling coil to remove fan heat.
NTF tunnel circuit arrangement. Dimensions in feet. Type of Testing Alpha Jet model. The NTF staff can model the customer s test objectives and test priorities utilizing a computerized test process simulator to design the most efficient test plan strategy with respect to cost, duration, and consumables. The NTF can accommodate various types of internal 6-component strain gage balances.