高压转子枞树型叶轮超声波相控阵检测技术的应用

Phased Array Ultrasonic Inspection for the Straddle Mount-type High-pressure Turbine Disc Inspection

超声波相控阵检测技术凭借其声束覆盖范围大、检测灵敏度和检测分辨力比常规超声检测技术更高的优点,成为了提升汽轮机叶轮等部件超声检测可靠性的不二选择。通过一系列针对汽轮机高压转子的超声波相控阵检测工艺试验,验证了超声波相控阵检测技术的适用性,并且通过比较不同的超声波定量方法确定了超声波相控阵检测定量(长度测量和高度测量)的工艺。应用超声波相控阵在枞树型叶上轮检测不仅解决了原有技术的局限性并且提高了检测的效率、可靠性和准确性。

As the stress corrosion cracks possibly occurring on the turbine disc rim are concerned increasingly by various nuclear power plants'vendors,it seems necessary to apply an improved inspection technology.The ultrasonic phased array(PAUT)technology,which possesses the advantages like large coverage,better detection capability and higher resolution than the conventional pulse-echo UT technology,becomes the prior option for the turbine impeller in-field inspection.This paper validated application of the PAUT on the straddle mount-type turbine disc inspection and determined the length and through-wall depth measurement via a series of experiments.The application of PAUT not only solves the conventional technique's limitation,but also improves the examination's efficiency,reliability and accuracy.