超声C扫描用喷水系统设计及其检测稳定性*

摘要：本文针对列车车体复合材料构件检测用超声C扫设备喷水系统的检测稳定性问题开展研究。基于喷水式超声耦合检测原理，设计了一种喇叭段+直管段的喷嘴，以使水流形成变径约束的层流，从而缩短喷嘴长度。结合实验分析了工艺参数对检测性能的影响。结果表明：喷嘴结构、耦合水流速、射水距离及检测方式等因素均对超声耦合稳定性及检测性能产生影响。试验结果可为喷水式耦合超声C扫技术在车体构件检测中的实际应用提供参考。

Design of coupling system with jetted water stream for ultrasonic c-scan and discussion on the stablity of inspection

Abstract: In this paper, the detection stability of the coupling system with jetted water stream for ultrasonic C-scan equipment for testing composite component of train body is studied. Based on the principle of coupling with jetted water stream method, a kind of nozzle with a horn section and a straight pipe section is designed to form a laminar flow with variable diameter, so as to shorten the length of the nozzle. The influence factors of ultrasonic inspection are analyzed by experiments. The test results show that the parameters, such as injector, squirting speed, squirting distance and detection method all affect the coupling stability and detection sensitivity. The experimental results can provide technical reference and guidance for the practical application of ultrasonic C-scan equipment with the coupling system with jetted water stream.