【摘要】 在一台单级低速轴流压气机试验台上,利用外部声激励,研究控制非定常流动分离的途径.重点考察了激励频率与压气机流场内典型的非定常特征频率的耦合关系以及激励强度、激励信号波形对轴流压气机非定常分离流动控制的影响.实验结果表明:激励频率和激励强度是分离流动控制中较为重要的两个参数,而激励信号波形的变化对分离流动控制也会产生一定影响(相对激励频率、幅值而言较弱).当激励频率为最优频率且幅值达到某一阈值之后,非定常流动分离能够得到有效推迟或抑制,压气机时均气动性能也会大幅度提升,其总压升特性相对值可提高约3.3%.更多还原

【Abstract】 The control methods of large-scale separated flows inside a low-speed axial-flow compressor facility were investigated by external acoustic excitations.The focus of research was put on the coupling relationship between excitation frequency and typical shedding frequency of unsteady separation vortex,while the influences of excitation amplitude and the types of the excitations signal wave on the flow control were explored.The experimental results indicate that the excitation frequency and excitation amplitude are the most importance parameters for controlling large-scale separated flows.The types of the excitation signal wave has some effects for separated flow control too.When the unsteady excitation was the most effective frequency with proper amplitude,the large-scale separated flow was delayed or controlled,and the flow field became more regular near the compressor’s stall margin.更多还原