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Research on the influence of integrated infrared suppressor exhaust angle on exhaust plume and helicopter infrared radiation

机译：综合红外抑制器排气角对排气羽流和直升机红外辐射影响的研究

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摘要

A numerical investigation is performed in the current study to illustrate the influences of exhaust angle of the integrated infrared suppressor on plume flow and helicopter infrared radiation, under the hover and cruise statuses. Three exhaust models are concerned, including the exhaust direction at 60 degrees, 45 degrees, and 18 degrees angles to the horizontal plane. The results show that the heating effect of the exhaust plume on the fuselage is modified with the decrease of the exhaust angle. However, the decrease in exhaust angle will reduce the pumping coefficient of the mixing duct to some extent, resulting in an increase of exhaust temperature. For the model with an exhaust angle of 18 degrees, three sets of comparative tests were designed. The results show that when there is no airflow outlet at the bottom of the fuselage, the surface temperature of the fuselage will increase significantly, and the position of the airflow outlet at the bottom of the fuselage also has a certain influence on the temperature field of the fuselage. On the horizontal detection plane, the infrared radiation intensity of the model with an exhaust angle of 60 degrees and 45 degrees is significantly lower than that with an exhaust angle of 18 degrees. In the vertical detection plane, especially in the direction below the fuselage, the infrared radiation intensity of the model with an exhaust angle of 18 degrees is the smallest. When compared to the hover status, the cruise status reduces the infrared radiation intensity somewhat. (C) 2021 Elsevier Masson SAS. All rights reserved.
机译：在目前的研究中进行了数值研究，以说明悬停和巡航状态下集成红外抑制器对羽流和直升机红外辐射的储气角度的影响。涉及三种排气模型，包括60度，45度和18度到水平面的排气方向。结果表明，随着排气角的减小，改变了排气羽流的加热效果。然而，排气角的降低将在一定程度上降低混合导管的泵送系数，导致排气温度的增加。对于排气角为18度的模型，设计了三组比较测试。结果表明，当机身底部没有气流出口时，机身的表面温度将显着增加，并且机身底部的气流出口的位置也对温度场具有一定影响机身。在水平检测平面上，排气角为60度和45度的模型的红外辐射强度明显低于18度的排气角度。在垂直检测平面中，尤其是在机身以下的方向上，具有18度的型号的模型的红外辐射强度是最小的。与悬停状态相比，巡航状态稍微减少了红外辐射强度。 （c）2021 Elsevier Masson SAS。版权所有。

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  • 来源
    《Aerospace science and technology》 |2021年第11期|107013.1-107013.23|共23页
  • 作者

    Yang Zongyao; Zhang Jingzhou; Shan Yong;

  • 作者单位

    Nanjing Univ Aeronaut & Astronaut Key Lab Thermal Management & Energy Utilizat Airc Coll Energy & Power Engn Nanjing 210016 Peoples R China;

    Nanjing Univ Aeronaut & Astronaut Key Lab Thermal Management & Energy Utilizat Airc Coll Energy & Power Engn Nanjing 210016 Peoples R China;

    Nanjing Univ Aeronaut & Astronaut Key Lab Thermal Management & Energy Utilizat Airc Coll Energy & Power Engn Nanjing 210016 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Helicopter; Integrating infrared suppressor; Infrared radiation; Exhaust plume; Exhaust angle;

    机译：直升机;集成红外抑制器;红外辐射;排气羽毛;排气角度;

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