进口探针支杆尾迹诱发压气机转子叶片共振的数值研究

Numerical Study of Compressor Rotor Blade Resonance Induced by Wake of Inlet Probe Support

关键词:  进口探针支杆  压气机  叶片共振  流固耦合  支杆尾迹涡

Key words:  Inlet probe support  Compressor  Blade resonance  Fluid-structure interaction  Strut wake vortex

摘要:

为了探究包含支杆直径10mm进口探针的压气机罕见地出现第一级转子叶片动应变超限报警的产生机理，以更换直径8mm+3mm的探针后报警解除的情况作为对比方案，开展了进口探针支杆诱发压气机转子叶片振动的流动机理研究。以试验压气机为研究对象，利用ANSYS APDL命令流语言使用载荷步文件法对该压气机转子叶片进行了单向瞬态流固耦合数值计算。结果表明，两类探针支杆尾迹影响下，压气机转子叶片都发生了共振；引起叶片共振的激振力频率来源于支杆尾迹诱导频率与支杆通过频率的叠加，其中支杆尾迹诱导频率是由支杆尾迹涡脱落与转子叶片通过非同相位所诱导产生；支杆直径减小，支杆尾迹引起的叶片表面激振力减小，使叶片振动应变相应降低。

Abstract:

In order to find out the mechanism of the first stage rotor blade dynamic strain over limit alarm rarely occurred in a compressor with a diameter of 10mm inlet probe，the flow mechanism of the compressor rotor blade vibration induced by the inlet probe support was studied by comparing the alarm release after replacing the 8mm + 3mm diameter probe.Taking the experimental compressor as the research object， the unidirectional transient fluid structure interaction numerical calculation of the compressor rotor blade is carried out by using the load step file method in ANSYS APDL command language.The results show that the compressor rotor blade resonates under the influence of two kinds of probe strut wake， and the frequency of the excitation force that causes the blade resonance comes from the superposition of the wake induction frequency of the strut and the passage frequency of the strut， in which the wake induction frequency of the strut is caused by the vortex shedding of the strut and the passage of the rotor blade through the non-homogeneous phase. As the diameter of the strut decreases， the exciting force on the blade surface caused by the wake of the strut decreases， and the vibration strain of the blade decreases accordingly.