Turbulent effects on the chemical reaction for a jet in a nonturbulent stream and for a plume in a grid-generated turbulence

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Abstract
Effects of turbulent mixing on a moderately slow second‐order chemical reaction between nitric oxide contained in a primary jet or plume and ozone being entrained from the ambient stream are experimentally investigated in low‐speed wind tunnels. The experiments are conducted both for a nonpremixed free jet injected into a nonturbulent, coflowing stream and for a nonpremixed plume emitted from a fixed source into a grid‐generated turbulent stream. In each flow, mean concentrations of NO and O3 are measured. In addition, eddy diffusivities are calculated from the measured values of turbulent momentum and heat flux in a nonreactive, slightly heated jet or plume. Numerical predictions of the mean concentrations of the reactive species, based on the eddy diffusivities, are compared with the measured ones. The results show that for moderately slow chemical reactions the turbulence effects on reaction rate become significant. The mean products of the concentration fluctuations are estimated to be 1.5 and 20 times as large as those of the products of the mean concentrations for a reactive jet and for a reactive plume, respectively.

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