Typical application cases II: labyrinth disc pressure equalization hole in situ testing

1. Overviews  
Engine labyrinth disc pressure equalization hole is easy to crack and serious threat to service life of the engine and normal flight of aircraft in the course of usage, the study has the important meaning for safe use of the engine that using special vortex detection method to test in situ the crack of labyrinth disc pressure equalization hole for outfield engine in service.  
Special probe
2. Method of application             
Due to the combination of design structure and vibration stress in use can cause crack of labyrinth disc pressure equalizing hole and threaten to normal flight even cause serious accidents, so that it becomes critical to test the pressure equalizing hole for engine in service and during repairing.. Since in-situ inspection, the sensor requires passing through three small pores of aircraft skin, engine casing and outer ducted, making the testing methods such as ultrasound, radiation and penetration not to be possible. From existing technical point of view using the vortex method to be possible, but the conventional vortex testing methods have edge effects and lift-off effect, causing difficult to distinguish defect signals between true and false, therefore it is required for achieving in-situ testing of labyrinth disc of certain type engine to research special vortex testing methods.
3. Superior characteristic     
The probe clamp researched and developed Independently can detect engine from dismantled aircraft, can also test directly engine in situ on the plane, effectively reduce the workload for disassembling and installing and improve work efficiency. 
4. Recommend instruments