Shock-Tube Study of the Kinetics of Nitric Oxide at High Temperatures

Abstract

A shock-tube program was carried out in which the NO concentration was followed as a function of time behind the shock front by absorption of 1270 A radiation, where ground vibrational state O2 and N2 are essentially transparent. The absorption coefficients of the species NO, O2, and N2 as functions of the respective vibrational temperatures were determined by measuring the absorption by the shock-heated gas at a point in the time history corresponding to complete vibrational relaxation but before the onset of dissociation. Time history analyses were made on a total of 42 shock-tube runs covering a temperature range of 3000°—8000°K on the following six mixtures: ½% NO, ½% NO+¼% O2, 10% NO, 50% NO, 20% air, and 100% air—the diluent in all cases being argon. An IBM 704 computer was programmed to integrate the vibrational and chemical rate equations as a function of time behind the shock front, subject to the constraints of the conservation equations. The pertinent rate constants were varied in a systematic trial-and-error manner in order to get the best fit to all the data.

Combustion Chemistry of Nitrogen

“…The subsequent measurements of Thielen and Roth (1984) are quite close to the earlier work of Wray and Teare (1962) (Figure 2.2). While the higher values of Koshi et ai.…”

A Shock Tube Study of the Thermal Decomposition of Nitric Oxide

“…The only two reported rates for k.; are based mainly on the results on either reaction (I) or (2). Wray and Teare (1962) calculated k_ l from the Downloaded by ["Queen's University Libraries, Kingston"] at 22:12 03 February 2015 equilibrium constant and the k 1 reported by Freedman and Daiber (1961); they found that this rate gave an adequate fit of their data (NO/AI' and air/AI' mixtures). Camac and Feinberg (1967), on the other hand, from their studies on shock heated air in which an induction period was observed before the NO increase and on pure NO decomposition deduced that k_ 1 should be at least 10 times lower than the value proposed by Wray and Teare (1962).…”

“…The list is not exhaustive but contains most of those reported in studies on NO decomposition and formation. Baulch et al (1970) and Lipkea et al (1973) Kistiakowsky et al (1969) Fishburne and Edse (1966 Wray and Teare (1962) Wray and Teare (1962) Wray and Teare (1962) Watt and Myerson (1969) Wray and Teare (1962) In the absence of actual experimental results, the rate constant chosen is generally the most recently reported for conditions as close as possible to those in the simulation. This criterion was used in assigning the rate reported by Wagner et al (1966) for reaction (4) since it has been confirmed in the recent shock tube study of N.O decomposition (Ne diluent) by Kistiakowsky et al (1969).…”

Simulation of hypersonic flows using a detailed nitric oxide formation model

“…However, the emphasis of the paper is mostly on the implementation of an advanced model for reaction ͑1͒ in a computational fluid dynamics ͑CFD͒ code. The first Zeldovich reaction ͓reaction ͑1͔͒, although much studied experimentally [6][7][8][9][10][11] in the combustion temperature range ͑TϽ5000 K͒, has not been investigated at higher temperatures and under nonequilibrium conditions. Recently, an extensive quasiclassical trajectory ͑QCT͒ study of this reaction was completed by the authors, 12-14 based on accurate ab initio potential energy surfaces.…”