Reason for Cracking of Straightener Blades of Compressor
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摘要: 某型发动机在厂内试车20 h后，其压气机整流叶片在叶身中部出现纵向裂纹。对开裂叶片进行外观检查、显微组织和断口形貌观察、硬度测试，研究了在发动机工作转速下叶片的振动情况，分析了裂纹成因。结果表明：整流叶片的开裂性质为高周疲劳开裂，裂纹是由于在发动机工作转速范围内存在由后排转子激起的旋弯共振而形成的；采取将叶片整体加厚的调频方案，将后排转子叶片激起旋弯共振的转速调至发动机最高转速以上，可以防止压气机整流叶片裂纹的产生。Abstract: After in-plant testing for 20 h, the straightener blades of the compressor in a certain type of aero engine showed longitudinal cracks in the middle of blade body. Appearance inspection, microstructure and fracture morphology observation and hardness testing were conducted on the cracked blades. The blade vibration at the working speed of the aero engine was studied and the formation cause of cracks was discussed. The results show that the crack mode of the straightening blade was high-cycle fatigue cracking. The cracks formed by rotating bending resonance caused by rear rotor in the working speed range of the engine. By adoption of frequency modulation scheme of thickening the whole blade, adjusting the speed at which the rear rotor blade stirred up the rotating bending resonance to above the maximum engine working speed, the crack formation of the compressor straightener blade could be prevented.
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