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• W1963636726 abstract "LDV measurements of spatial velocity correlations and integral length scales in a swirling jet and a swirling diluted hydrogen flame are described. The experimental setup consists of two conventional laser Doppler anemometers working in forward scattering mode, one fixed and the other moved by a special traversing system. From experimental observations, the validity of the assumption of self-preserving turbulence is analyzed. This assumption postulates that the two-point correlation of a physical quantity in a turbulent field can be expressed by one length scale and one timescale only. Thus, the ratio between the longitudinal and transversal length scales in a turbulent fløw field should not change within the field. This is a main assumption for all statistical turbulence models, as well as for the more elaborate second-order closure models. Also addressed is the question of whether the gradient of velocity changes strongly within the turbulent length scale, which concerns the rapid term model used for calculation of the pressure strain correlation in second-order closure. The main results are the following.o1.The length scale ratios near the nozzle change because of history effects.2.The recirculation zone diminishes these effects.3.Combustion alters the position of the recirculation zone and increases the length scales.4.There is a strong change of the velocity gradient with the turbulent length scales in front of the recirculation zone, which seems to be a main difficulty in the simulation of swirling flows. The length scale ratios near the nozzle change because of history effects. The recirculation zone diminishes these effects. Combustion alters the position of the recirculation zone and increases the length scales. There is a strong change of the velocity gradient with the turbulent length scales in front of the recirculation zone, which seems to be a main difficulty in the simulation of swirling flows." @default.
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• W1963636726 date "1996-01-01" @default.
• W1963636726 modified "2023-10-17" @default.
• W1963636726 title "Turbulent length scales in a swirling flame" @default.
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• W1963636726 doi "https://doi.org/10.1016/s0082-0784(96)80217-7" @default.
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