在此基础上，确定了压气机的喘振边界线。
On this basis, the surge boundary line of the compressor was determined.
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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