Thermochemical generation of CS for CO chemical lasers

Buonadonna, V. R.; Richardson, R. J.

doi:10.2514/3.7192

AIAA Journal

1976

DOI: 10.2514/3.7192

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Thermochemical generation of CS for CO chemical lasers

V. R. Buonadonna

R. J. Richardson

Abstract: The development of a thermochemical technique for generating large quantities of carbon monosulfide (CS) is reported. The CS is produced from the thermal dissociation of carbon disulfide (CS 2 ) in a cyanogen-oxygen-CS 2 combustor operating at 1 atm and temperatures in excess of 2500 K. The CS is extracted from the combustor through a Mach 4 supersonic nozzle. The supersonic flow stream was sampled and then analyzed with a quadrupole mass spectrometer, and the data were compared with the results of an equilibr… Show more

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Thermochemical generation of CS and S for CO chemical lasers

Richardson

Buonadonna

1977

Journal of Applied Physics

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A thermochemical equilibrium calculation is compared with the experimental results of active mass spectrometric sampling of a high-temperature NF3-CH4-H2-CS2 flame. The predicted flow rate of the products HF, CS, N2, and CS2 is found to agree with the experimental data. The presence of S among the product species is inferred from a second experiment, in which the flux from the high-temperature combustor was extracted through a supersonic nozzle and mixed with a second supersonic stream containing He and O2. The flow rate of the reaction product CO determined during the latter experiment is compared with the flow rate predicted by a kinetics model of the chain reaction between CS and O2 initiated by small amounts of S. It is suggested that such a CS and S generator coupled with a supersonic mixing nozzle could be utilized to construct a completely chemical CO laser of any desired output power.

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Thermochemical generation of CS and S for CO chemical lasers

Richardson

Buonadonna

1977

Journal of Applied Physics

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CO chemical laser utilizing combustor-generated reactants

Richardson

Ageno

Lilenfeld

et al. 1979

Journal of Applied Physics

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A CO chemical laser utilizing combustor-generated CS and S is described. The combustor is fueled with NF 3 -CH 4 -H 2 -CS 2 and produces CS and S and the side products HF and N 2 . A common supersonic expansion mixing nozzle is used to extract the CS find S from the combustor and mix O 2 and diluent (N2 or He) into the flow stream. A chain reaction between CS and O 2 in the mixed flow stream, initiated by S atoms, produces vibrationally excited CO. The maximum power obtained from the laser was 700 W operating with He in a free expansion. Pressure and temperature measurements of the supersonic flow stream are compared with the results of a onedimensional fluid-dynamics model, and the results of mass-spectrometric sampling are presented. It is concluded that the power extraction efficiency could be greatly improved by operation of the laser with either a combustor fuel-oxidizer combination that does not produce HF or an improved supersonic mixing nozzle. Nevertheless, it has been demonstrated that the output power of this device scales with mass flowrate.

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Combustor-driven CO chemical laser

Richardson¹,

Wiswall²

1978

Applied Physics Letters

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Operation of the first supersonic combustor-driven purely chemical CO laser is reported. The combustor is fueled with NF3-CH4-H2-CS2 and produces a mixture of HF, N2, CS, CS2, and S which is mixed with dry air and N2O during a supersonic expansion into the laser cavity. A chain reaction involving CS and O2 is initiated by the S atoms and produces CO with a non-Boltzmann vibrational-rotational energy-level population distribution. The laser produces 450 W of closed-cavity power as determined by mirror calorimetry.

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Thermochemical generation of CS for CO chemical lasers

Cited by 3 publications

References 10 publications

Thermochemical generation of CS and S for CO chemical lasers

Thermochemical generation of CS and S for CO chemical lasers

CO chemical laser utilizing combustor-generated reactants

Combustor-driven CO chemical laser

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