超声速民机因其在长距离、长航时航线运输方面所具有的明显优势，已成为未来民机的重要发展方向。“绿色航空”概念的提出使得节能减排和降噪越来越成为民机的重要优化设计目标之一，自然对其动力装置也提出了相应的要求。传统构型动力无法实现起飞低噪声、超巡高单位推力、低耗油率和低排放指标的兼顾。本文以带CDFS的双外涵变循环发动机构型为研究对象，考虑发动机性能及喷流噪声、NOx排放等关键优化设计目标，开展可调几何控制规律设计方法研究。研究表明，提高第一外涵分流比有助于降低NOx排放，提高内涵和第二外涵分流比有助于降低喷流噪声。将设计结果应用于第一代超音速客机“协和号”动力装置重优化设计，与基准方案相比，在满足飞机性能需求的前提下，超音巡航工况耗油率降低了20.19%，起飞工况喷流速度实现了44.47%的降幅，使得起飞噪声指标满足适航要求。
Due to its obvious advantages in long-distance and long-endurance transport, supersonic civil aircraft has become an important development direction for future civil aircraft. The concept of ‘green aviation’ makes energy saving, emission reduction and noise reduction become one of the important optimization design objectives of civil aircraft, which naturally puts forward corresponding requirements for its power plant. The traditional configuration power cannot achieve the low noise at take-off, high thrust per unit for super-cruise, low fuel consumption rate and low emission indexes. This paper takes the dual-containment variable-cycle engine configuration with CDFS as the research object, and carries out the research on the design method of adjustable geometry control law considering the key optimization design objectives of engine performance and jet noise, NOx emission, etc. The research shows that improving the first-containment variable-cycle engine is the most effective way to improve the performance of the first-containment engine. The study shows that increasing the first culvert split ratio helps to reduce NOx emissions, and increasing the inner and second culvert split ratios helps to reduce jet noise. The design results are applied to the power unit reoptimization design of the first-generation supersonic airliner “Concorde”, and com-pared with the baseline scheme, the supersonic cruise operating fuel consumption rate is reduced by 20.19% and the takeoff operating jet speed is reduced by 44.47% under the premise of meeting the performance requirements of the aircraft, so that the takeoff noise index meets the airworthiness requirements. The takeoff noise index meets the airworthiness requirements.
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