基于七阶耗散紧致格式的飞机机体气动噪声高效预测方法研究

It is significantly important to investigate airframe noise radiated from complex geometry such as high-lift device and leading gear based on high-order numerical method. The seventh-order hybrid dissipative compact scheme (HDCS-E8T7) developed by the workgroup of the proposer has demonstrated its potential capacity on noise prediction for complex geometry. However, extending this method still has two obstacles to noise prediction for complex geometry such as high-lift device and leading gear. First, the ability of this method is insufficient to handle complex geometry such as high-lift device and leading gear; second, the computational efficiency is not enough. In the circumstances, we propose this project to develop the patched grid and p-multigrid techniques for the HDCS-E8T7, so as to enhance the ability of this scheme to handle complex geometry and improve the computational efficiency. Then, the developed method will be used to provide high-efficient noise prediction for high-lift device and landing gear, to investigate the noise mechanisms within these complex configurations.

采用高精度数值方法研究以增升装置和起落架为代表的复杂机身气动噪声具有重要的意义。申请人所在课题组自主构造的七阶混合型耗散紧致格式HDCS-E8T7已经显示了其模拟复杂外形气动噪声问题的潜力，但是要成功应用于以增升装置和起落架为代表的机身气动噪声预测，该方法对三维复杂外形的适应能力还存在不足，而且计算效率也无法满足需要。因此，本项目拟发展与七阶HDCS-E8T7格式匹配的拼接网格和p-multigrid技术，提升该格式对三维复杂外形的适应能力以及计算效率，实现三维复杂增升装置和起落架气动噪声的高效预测，探讨其中的噪声产生机制。

完成了《基于七阶耗散紧致格式的飞机机体气动噪声高效预测方法研究》任务书的研究内容，发展了气动噪声预测的高精度方法，并把该方法推广应用于复杂外形数值模拟，在此基础了数值模拟了起落架和增升装置流动，研究了其中的气动噪声机制。

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