Engineering topics

Zambrana, Horacio A.

Publications and source records attributed to Zambrana, Horacio A..

3 records

NASA NTRS1992

30 degree injectors at hypervelocity conditions

Results are presented of the first high-speed propulsion-related experiments performed in the NASA-Ames 16-Inch Shock Tunnel, designed to simulate combustor inlet conditions at approximately Mach 14. Results demonstrate the capability of the tunnel for high-speed propulsion testing and yield data on the performance of 30-deg flush wall injectors tested in the tunnel. The experimental results are compared with those of a CFD analysis.

Loomis, Mark P.↗

NASA NTRS1992

Flow characterization in the NASA Ames 16-inch Shock Tunnel

Flow characteristics of NASA's 16-Inch Shock Tunnel are determined for purposes of providing hypersonic propulsion simulation capability. The key tunnel operating parameters are the incident shock speed and reservoir pressure and enthalpy. Flow characteristics of concern are the nozzle exit pressure, temperature, Mach number, Reynolds number, chemical composition, and flow uniformity. Surface mounted gages (for pressure and heat transfer) and nonintrusive optical flow diagnostics (emission and absorption spectroscopy and holographic interferometry) are used to verify tunnel conditions. Experimental measurements are used to validate computational analysis for predicting facility performance, and CFD is used to interpret the free stream optical diagnostic measurements.

Cavolowsky, John A.↗

NASA NTRS1992

Reactivation and upgrade of the NASA Ames 16-Inch Shock Tunnel - Status report

The NASA Ames 16-Inch Shock Tunnel has been reactivated after seventeen years of inactivity. In the years before deactivating the facility, it was operated at enthalpies of 4,700 J/gm and pressures up to 260 atm or at enthalpies of 1900 J/gm over a wide pressure range. Since reactivating, the facility has been operated at enthalpies up to 12,000 J/gm and pressures up to 408 atm. The present paper describes the steps taken in upgrading the facility and summarizes the currently achievable conditions. The selection of the driver gas, the steps taken to improve the driver burn, and the diaphragm opening techniques are described. The pressure and heat flux instrumentation, the optical diagnostics and the data acquisition system are also described.

Bogdanoff, David W.↗