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。
The results show that the reason why surge happened is that flow area of nozzle ring and blade was decreased.
随海拔的增高，涡轮增压器与柴油机的联合运行线逐步逼近喘振边界线，压气机效率下降；
With the heightening of the altitude, the turbo supercharger and the diesel associated running curves approach blow vibration borderline, and air compressor's efficiency comes down;
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