Jet Mixings of Alternating-Lobe Nozzles under Pumping Air Intake and Stamping Air Intake Conditions
Jet Mixings of Alternating-Lobe Nozzles under Pumping Air Intake and Stamping Air Intake Conditions
复制标题
泵送进气和冲压进气条件下交替叶片喷嘴的射流混合
DOI：
10.3390/aerospace9110700
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发表时间：
2022-11
期刊：
影响因子：
2.6
通讯作者：
Bowen Zhong
中科院分区：
文献类型：
--
作者：
Zhiqiang Sheng;Yu Dan;Lan Zhang;Bowen Zhong
采用3种不同的远场速度对共面交替波瓣喷管（CoALN）、嵌接式交替波瓣喷管（ScALN）、剑形交替波瓣喷管（SwALN）和剑形与人字形交替波瓣喷管（SwChALN）的射流混合进行了数值模拟，模拟了泵送进气和冲压进气条件。结果表明，冲压进气道可用于直升机红外抑制器的冷空气掺混。研究发现，冲压进气道增加了混合管附近的冷气流量，可以有效降低混合管的温度，从而提高红外抑制性能。在这两种进气条件下，对于短混合管的普通红外抑制器，推荐使用SwALN和SwChALN;而对于长混合管的集成红外抑制器，则应采用CoALN和ScALN。纵向涡的形状与大尺度热质对流密切相关。较丰满的纵向涡可以使受影响区域的混合更快。
Jet mixings of a coplanar alternating-lobe nozzle (CoALN), scarfing alternating-lobe nozzle (ScALN), sword alternating-lobe nozzle (SwALN), and sword and chevron alternating-lobe nozzle (SwChALN) were numerically investigated using three different far-field velocities to simulate the conditions of pumping air intake and stamping air intake. It was confirmed that the stamping air intake can be introduced to increase the cool air involved in the mixing for an infrared suppressor of a helicopter. It was found that the stamping air intake increases the amount of cool stream near the mixing tube, which can effectively decrease the temperature of the mixing tube, thus improving the infrared suppression performance. Under the two intake conditions, for a normal infrared suppressor with a short mixing tube, SwALN and SwChALN are recommended; however, for an integrated infrared suppressor with a long mixing tube, CoALN and ScALN should be adopted. The shape of the longitudinal vortices is closely related to the large-scale heat and mass convection. The plumper longitudinal vortices can bring faster mixing to the affected region.
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