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Evaluating the Effectiveness of Infrared Signature Suppression of Aircraft Skin

机译：评估飞机皮肤的红外签名抑制效果

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摘要

During typical supersonic cruising, the temperature of the aircraft skin rises above 300 K due to aerodynamic heating. In this situation, aircraft-skin infrared (IR) suppression, used to minimize the radiation contrast from the background is a crucial survival technology. In the present study, a technique to evaluate the effectiveness of IR suppression of aircraft skin is proposed. For this purpose, a synthetic procedure based on numerical simulations has been developed. In this procedure, the thermal status of aircraft skin is obtained using a computational fluid dynamics (CFD) method for complex aircraft geometries. An IR signature model is proposed using a reverse Monte Carlo (RMC) technique. The detection range and the IR contrast are adopted as the performance indicators for the evaluation of the aircraft IR suppression. The influence of these factors related to the aircraft-skin radiation, such as aircraft-skin emissivity, surface temperature distribution and flight speed, on the IR contrast and the detection range is also studied. As a test case, the effectiveness of various IR suppression schemes was analyzed for a typical air combat situation. Then, the method is applied to clarify the contribution of each aircraft component to the IR suppression of the overall IR radiation. The results show that aircraft-skin temperature control and emissivity control are effective means to reduce the IR radiation and to achieve lower detection. The results can be used as a practical guide for designing future stealth aircraft.
机译：在典型的超音速巡航期间，由于空气动力加热，飞机蒙皮的温度升高到300 K以上。在这种情况下，用于最小化来自背景的辐射对比度的飞机皮肤红外（IR）抑制是一项至关重要的生存技术。在本研究中，提出了一种评估飞机皮肤红外抑制效果的技术。为此，已经开发了基于数值模拟的合成程序。在此过程中，针对复杂的飞机几何形状，使用计算流体力学（CFD）方法获得飞机蒙皮的热状态。使用反向蒙特卡洛（RMC）技术提出了IR签名模型。检测范围和红外对比度被用作评估飞机红外抑制的性能指标。还研究了与飞机皮肤辐射有关的这些因素，例如飞机皮肤的发射率，表面温度分布和飞行速度，对红外对比度和检测范围的影响。作为测试案例，针对典型的空战情况分析了各种红外抑制方案的有效性。然后，该方法将用于阐明每个飞机部件对整体IR辐射的IR抑制的贡献。结果表明，飞机表面温度控制和发射率控制是减少红外辐射并降低探测率的有效手段。研究结果可作为设计未来隐形飞机的实用指南。

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