What is turbine differential expansion?

1 Answers
PhoebeAnn
07/29/25 10:22pm
Turbine differential expansion refers to the relative expansion between the turbine rotor and the cylinder. During turbine startup, as the temperature rises, both the rotor and the cylinder expand based on their respective fixed points. The cylinder, being massive and exposed to steam on one side, expands slowly, while the rotor, being lighter and rotating within the steam, expands more rapidly. Related information: Types of differential expansion: Based on cylinder classification, it can be categorized into high differential, medium differential, low I differential, and low II differential. Causes of excessive differential expansion: During startup, insufficient warm-up time, rapid speed increase or load increase, low steam temperature or flow rate in the cylinder interlayer or flange heating device, resulting in weak heating effect.
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