超声速全机带动力短舱对近场压力信号和地面声爆的影响

新一代环保高效的超声速商用飞机是近年来研究的热点, 低声爆技术是关键技术之一。研究声爆的影响因素有助于推进低声爆设计技术的发展。就超声速飞机整机而言, 发动机对近场和远场压力信号及地面声爆的影响颇为重要。国内外众多学者和研究单位对此进行了研究。中国商飞北研中心针对超声速带动力对近场压力信号和声爆的影响展开了一系列研究, 选取美国AIAA声爆预测会议提供的低声爆验证标模NASA C25D, 针对通气短舱和动力短舱构型进行了数值模拟和分析研究, 采用基于Euler方法和基于RANS方法的定常计算, 通过波形参数法由近场压力信号计算地面声爆信号, 并转化为可感知强度值, 与部分参会者的结果进行了对比。总结了黏性、是否带动力对超声速飞机近场压力信号和声爆的影响, 为未来超声速商用飞机的低声爆设计储备技术基础。 

Influence of Supersonic Aircraft with Powered Engine on Near-Field Pressure Signal and Ground Sonic Boom

The new generation of environmentally friendly and reliable supersonic commercial aircraft has been a hot research topic in recent years, and low sonic-boom technology is one of the key technologies. Studying the influencing factors of sonic boom helps to promote the development of low sonic-boom design technology. As far as the supersonic aircraft is concerned, the influence of the engine jet on the near-field and far-field pressure signals and the ground sonic-boom is quite important. Many scholars and research units at home and abroad have conducted researches on this subject. Beijing Aircraft Technology Research Institute of COMAC conducted a series of studies on the impact of supersonic jets on near-field pressure signals and sonic booms. And selected the low-sonic-boom standard model NASA C25D provided by the AIAA Sonic Boom Prediction Workshop. The numerical simulation and analysis of the configurations of ventilated nacelles and powered nacelles were carried out. The steady computations based on Euler method and RANS method were adopted, and the ground sonic-boom signals were calculated from the near-field pressure signals by the waveform parameter method, and converted into the perceptible loudness values, which were compared with those of some participants. The effects of supersonic jets on nearfield pressure signals and sonic boom were summarized, and the technical basis for the low sonic boom design of future supersonic commercial aircraft was reserved.