航空发动机

易立，单勇，张靖周，孙文静.带红外抑制器的直升机整机红外辐射特性数值计算[J].航空发动机,2025,51(2):97-104

带红外抑制器的直升机整机红外辐射特性数值计算

Numerical Investigation on Infrared Characteristics of a Helicopter with Infrared Suppressor

DOI：

英文关键词:helicopter infrared radiation characteristics infrared suppressor numerical calculation solar radiation

基金项目:国家级研究项目资助

作者	单位
易立，单勇，张靖周，孙文静	南京航空航天大学能源与动力学院，南京 210016

摘要点击次数: 440

全文下载次数: 344

中文摘要:

为获得直升机整机的红外辐射特征，构建了带分流引射式红外抑制器的直升机模型，耦合旋翼下洗气流、前飞来流和排气喷流，考虑发动机机匣、红外抑制器与机身的换热，研究了直升机整机在悬停、飞行状态下的整机红外辐射空间分布。结果表明：在悬停状态下，旋翼下洗气流呈现“螺旋”状流动，表现为“下压”排气喷流并使其偏向左侧，从而引起整机辐射的左右不对称；在前飞状态下，前飞来流与旋翼下洗气流相互作用，共同影响排气喷流的发展。太阳辐射使向阳面机身蒙皮温度显著升高，整体温升为10 K左右，最高温升可达23 K，改变太阳光入射方向，机身向阳面蒙皮温升程度相似，温升区域改变。整机3~5 μm波段，飞行速度增大导致气体红外辐射强度降低，在270 km/h下较悬停时的降低35%左右，太阳辐射则使机身向阳面蒙皮辐射显著增强，增幅最高可达30%以上；整机8~14 μm波段，红外辐射强度受飞行速度影响较小，在不同速度下差异为2%左右，太阳光自机身侧方入射时，向阳侧较另一侧8~14 μm波段红外辐射强度整体提升10%左右。

英文摘要:

In order to obtain the infrared radiation characteristics of the whole helicopter, a helicopter model with multi-nozzles ejec? tor infrared suppressor was constructed. Coupling with rotor downwash flow, forward incoming flow and exhaust jet flow, and considering the heat transfer of engine casing, infrared suppressor and fuselage, the spatial distribution of infrared radiation of the whole helicopter under hovering and flying conditions was studied. The results show that: in the hover condition, the rotor downwash airflow exhibits a "spiral" flow, which is manifested as "press down" exhaust jet and makes it deviate to the left, resulting in the left and right asymmetry of the radiation of the whole helicopter. In the forward flight condition, the forward incoming flow interacts with the rotor downwash flow to affect the development of the exhaust jet. Solar radiation significantly increases the skin temperature on the sunny side of the fuselage. The overall temperature rise on the sunny side of the fuselage is about 10 K, and the maximum temperature rise can reach 23 K. Changing the direction of sunlight incidence, the extent of the temperature rise of the skin on the sunny side of the fuselage is similar, and the temperature rise area changes. In the 3 μm to 5 μm band, the increase of flight speed leads to the decrease of gas infrared radiation intensity, which is about 35% lower at 270 km/h compared to that at hovering condition, and the solar radiation significantly increases the sunny side skin radiation, up to 30% or more. In the 8 μm to 14 μm band, the infrared radiation characteristics of the whole helicopter are less affected by the flight speed,, with a difference about 2% at different speeds. When the sunlight is incident on the side of the fuselage, the overall infrared radiation intensity in the 8 μm to 14 μm band of the sunny side is about 10% higher than that of the other side.

查看全文查看/发表评论下载PDF阅读器