HVOF gas flow field characteristics
- Idaho National Engineering Lab., Idaho Falls, ID (United States)
- Hobart Tafa Technologies Inc., Concord, NH (United States)
The effects of combustion chamber pressure and fuel/oxygen mixture ratio on the characteristics of a high pressure, supersonic HVOF gun are examined experimentally and theoretically. The measured temperature, velocity and entrained air fraction are obtained from an enthalpy probe/mass spectrometer system. Predictions of combustion chamber flame temperature and composition are calculated with an equilibrium combustion model. Nozzle and barrel exit conditions are calculated using a one-dimensional rocket performance model. The calculations are bounded by the assumption of frozen and equilibrium compositions. Comparisons between measurements and the predictions indicate that the flow field is far from chemical equilibrium. The aerodynamic force available for accelerating a particle is primarily controlled by the chamber pressure while the composition and temperature of the gas surrounding the particles is controlled by the mixture ratio.
- DOE Contract Number:
- AC07-76ID01570
- OSTI ID:
- 160464
- Report Number(s):
- CONF-940684--; ISBN 0-87170-509-5
- Country of Publication:
- United States
- Language:
- English
Similar Records
On the gas dynamics of HVOF thermal sprays. [HVOF (High-Velocity Oxy-Fuel)]
HVOF: Particle, Flame Diagnostics and Coating Characteristics