研究目的
To discuss factors influencing aircraft infrared radiation, its simulation and measurements, and to introduce results of small aircraft infrared radiation measurements for validating methodology in engine-airframe thermal integration.
研究成果
The ESPOSA project successfully developed and implemented a multi-physical aero-thermal optimization for engine-airframe integration, reducing infrared radiation. Theoretical CFD methods and practical measurements validated the methodology, showing potential improvements for minimizing infrared signatures in small aircraft.
研究不足
The measurements were conducted during ground tests, which may not fully replicate in-flight conditions. Environmental factors like humidity and wind could affect accuracy. The study focused on small aircraft, and results may not be directly applicable to larger aircraft.
1：Experimental Design and Method Selection:
The study involved theoretical investigations using CFD methods for aero-thermal integration and practical infrared radiation measurements of small aircraft demonstrators.
2：Sample Selection and Data Sources:
Small aircraft demonstrators EM-11 ORKA and I-31T equipped with TP-100 turbine engines were used.
3：List of Experimental Equipment and Materials:
A Testo 885-2 thermal imager (320 x 240 pixels, spectral range
4：5–14 μm, refresh rate 33 Hz), thermocouples (T1, T2, T3, T4) for temperature measurement, and engines with parameters like rotation frequency, exhaust gas temperature, and oil temperature. Experimental Procedures and Operational Workflow:
Engine ground tests were conducted, including start, warm-up, taxiing, idling, take-off, cruising, approach, and stopping regimes. Infrared images were recorded, and temperatures were measured at specific points on the nacelle. Environmental conditions such as sun position, wind direction, and humidity were considered.
5：Data Analysis Methods:
Temperature distributions along reference lines on nacelle surfaces were analyzed from infrared images, and results were compared with theoretical CFD simulations.
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