波瓣喷管红外抑制器红外辐射特性的数值研究

发布时间：2018-07-29 17:08

【摘要】：对具有不同尾缘形状的两种波瓣喷管红外抑制器的红外辐射特性进行数值研究。在流场计算结果的基础上,计算了不同探测方位角下,两种红外抑制器在3~5?m波段的红外辐射亮度和点源探测功率,对两种红外抑制器的红外隐身性能进行评估。研究结果表明,交变波瓣喷管的引射掺混性能较普通波瓣喷管好,明显降低了混合管壁面和尾焰气体的温度;在相同探测条件下,交变波瓣喷管红外抑制器在3~5?m波段的红外抑制效果优于普通波瓣喷管红外抑制器,前者比于后者,最大可分别降低固体壁面和尾焰气体探测功率15.7%和13.3%,整体探测功率降低14.5%,有利于红外隐身性能的提高。结果还显示,固体壁面辐射约占红外抑制器整体辐射的80%。因此,对红外抑制器进行优化时,应能有效降低固体壁面辐射。
[Abstract]:The infrared radiation characteristics of two kinds of wave-lobe nozzle infrared suppressor with different tail edge shapes are studied numerically. Based on the results of flow field calculation, the infrared radiance brightness and point source detection power of two kinds of infrared suppressor at different detecting azimuth are calculated. The infrared stealth performance of two kinds of infrared suppressor is evaluated. The results show that the mixing performance of the alternating lobe nozzle is better than that of the conventional valve nozzle, and the temperature of the wall and the tail flame gas of the mixing tube is obviously reduced under the same detection conditions. The infrared suppression effect of the alternating lobe nozzle infrared suppressor is better than that of the conventional wave lobe nozzle infrared suppressor in the band of 3 ~ 5 nm, and the former is better than the latter. The maximum detection power of solid wall and tail flame gas can be reduced by 15.7% and 13.3%, and the whole detection power is reduced by 14.5T, which is beneficial to the improvement of infrared stealthy performance. The results also show that the solid wall radiation accounts for about 80% of the total radiation of the infrared suppressor. Therefore, when the infrared suppressor is optimized, it can effectively reduce the solid wall radiation.
【作者单位】：南京理工大学能源与动力工程学院;
【分类号】：TN21

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