The results show that the reason why surge happened is that flow area of nozzle ring and blade was decreased.
结果表明：增压器喷嘴环和涡轮叶片流通面积减少是涡轮增压器喘振的主要原因。
2
One of the key-technologies of guiding device investment casting is getting internal ring, external ring and blade unit by splitting integral guiding device part for wax-mold design.
Using resistance strain gage, dynamic pressure sensor, slip ring and tape recorder, the blade vibration strain and exit pressure signals of rotor blades are recorded and then processed.