Arc-heater as an Atomic Oxygen Generator

The Review of Laser Engineering

Komurasaki

et al. 2008

Self Cite

A continuous wave laser driven wind tunnel has been developed to produce high enthalpy flows to simulate atmospheric reentry environment. As a result of preliminary operation tests, high enthalpy argon/oxygen flows were successfully generated with the input laser power of 800 W, the plenum pressure of 950 kPa and the plume diameter of 15 mm. Next, plume characteristics were diagnosed by laser absorption spectroscopy. Consequently, the radial distributions of the specific enthalpy were measured. It was found that the specific enthalpy of flow was around 4 MJ/kg at the radial position r < 3 mm.

Section: Principle Of Laser Absorption Spectroscopymentioning

confidence: 99%

Generation of Plasma Flows by 2 kW-class Continuous Wave Laser Driven Wind Tunnel

Shinmi

The Review of Laser Engineering

Komurasaki

et al. 2008

Self Cite

“…Details of the arc-heater and laser absorption spectroscopy measurement are described in the reference [4][5][6].…”

Section: Input Conditionsmentioning

confidence: 99%

“…In our previous research 4- 6) , number density of meta-stable atomic oxygen in the University of Tokyo arc-heater plume was measured by laser absorption spectroscopy as shown in Fig.1. As a result, the number density was found in the order of 10 16 m -3 .…”

Section: Introductionmentioning

confidence: 99%

Estimation of Atomic Oxygen Concentration by Semi-Empirical Collisional-Radiative Model in High Enthalpy Flow

37th AIAA Thermophysics Conference

Takayanagi

Oda

et al. 2004

Self Cite

Collisional-radiative model for atomic oxygen was applied to arc-heater plumes to clarify a mechanism of population density. The model with input parameters obtained by laser absorption spectroscopy and a single probe measurement shows consistent results with that of emission spectroscopy. As a result, the population density was found not to obey the Boltzmann distribution. The number density of ground level was estimated 20% lower than that in Boltzmann distribution.

“…For the enhancement of oxygen dissociation, a hollow cathode arc-heater was developed to supply oxygen through the cathode tip into the high temperature cathode-jet region as shown in Fig.2. 9 Consequently, the degree of dissociation in oxygen increased. However, the severe cathode erosion up to 1.5x10 -3 g/s limited the operation time shorter than twenty minute.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Zirconium Cathode Arc-Heater Plume by Laser Absorption Spectroscopy

25th AIAA Aerodynamic Measurement Technology and Ground Testing Conference

Ikemoto

Takayanagi

et al. 2006

Self Cite

An arc-heater with pre-mixed gas injection system of argon and oxygen has been developed and its performances were characterized. To reduce the cathode erosion zirconium was used as a cathode material. Consequently, stable discharge was maintained for more than three hours with small cathode erosion rate of 1.7x10-5 g/s, which corresponds to the erosion speed of the cathode surface of 0.27 mm/hour. From LAS diagnostics, oxygen was found fully dissociated in the center of plume at the radial position less than 6 mm. The atomic oxygen flux and the total specific enthalpy around the centerline were estimated at 3.1x10 19 atom/cm 2 s, 4.5±0.1 MJ/kg, respectively.