A database of flow and near pressure field signals obtained for subsonic and supersonic jets impinging on a flat or a perforated plate using large-eddy simulations

The time signals obtained in the flow and near pressure fields of subsonic and supersonic jets impinging on a flat or perforated plate computed by highly-resolved compressible large-eddy simulations (LES) using cylindrical coordinates (r,theta,z) have been stored in a database. As is the case for the data obtained recently for free jets, they can be shared with other researchers, upon request by email, to investigate, for instance, the development of turbulent structures and noise generation mechanisms in impinging jets. The jet conditions (Mach and Reynolds numbers, temperature) and nozzle-exit boundary-layer characteristics (thickness, velocity profile, fluctuation level), the LES grid parameters and the recorded signals (nature and location of the variables stored, time duration and sampling frequency) are briefly described in this short note.

通过高分辨率可压缩大涡模拟（large-eddy simulations，LES）、采用柱坐标系（cylindrical coordinates，r,θ,z）计算得到的亚音速与超音速射流撞击平板或多孔板时的流场及近场压力场时间信号，已存储于数据库中。与近期获取的自由射流数据相同，这些数据可应研究者的邮件请求与其他学者共享，用于探究撞击射流中湍流结构的演化规律及噪声生成机制等课题。本短文简要介绍了射流条件（马赫数、雷诺数、温度）、喷嘴出口边界层特性（厚度、速度剖面、脉动水平）、LES网格参数，以及记录信号的相关信息（存储变量的性质与位置、时长及采样频率）。