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首页> 外文期刊>Journal of Thermophysics and Heat Transfer >Influence of Turbulent Fluctuations on the Radiation Intensity Emitted from Exhaust Plumes
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Influence of Turbulent Fluctuations on the Radiation Intensity Emitted from Exhaust Plumes

机译：湍流涨落对废气羽流辐射强度的影响

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摘要

Measured and computed mean and fluctuating radiation intensities are reported for a subsonic exhaust plume and used to characterize the influence of turbulent fluctuations on mean radiation properties. Narrowband radiation intensity measurements were acquired using an infrared camera fitted with a narrowband filter (4.34 ± 0.1 μm). Unsteady three-dimensional calculations were used to estimate both time-dependent and mean temperature and partial pressure values of the exhaust species in the flow. From these scalar values the mean and root mean square of the radiation intensity were calculated using a narrowband radiation model. Axial distributions of the calculated intensities based on the time-dependent quantities show trends similar to those measured, but consistently overpredict the intensity by 40%. Intensity distributions based on mean scalars were in better quantitative agreement, but decay more rapidly downstream than experimental data. Turbulent fluctuations have little effect on the mean radiation intensity near the nozzle exit, but they become increasingly more important downstream in the flow. The influence of turbulent fluctuations on mean intensity values increases with radial distance from the centerline. This trend correlates to increases in normalized fluctuations in the temperature and radiation intensity.
机译：报告了亚音速排气羽流的测量和计算的平均辐射强度和波动的辐射强度，并用于表征湍流波动对平均辐射特性的影响。使用装有窄带滤光片（4.34±0.1μm）的红外热像仪获取窄带辐射强度的测量值。非稳态三维计算被用来估计时间相关的以及排气中物质的平均温度和分压值。根据这些标量值，使用窄带辐射模型计算辐射强度的均方根和均方根。基于随时间变化的量计算出的强度的轴向分布显示出与测得的趋势相似的趋势，但始终将强度高估了40％。基于平均标量的强度分布具有更好的定量一致性，但比实验数据在下游的衰减更快。湍流涨落对喷嘴出口附近的平均辐射强度影响不大，但在气流下游变得越来越重要。湍流波动对平均强度值的影响随距中心线的径向距离而增加。这种趋势与温度和辐射强度的标准化波动增加有关。

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