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Abstract: A pneumatic system consisted of a relatively large
container and a short tube is interuiewed. The system is carefully
modeled and heat transfer is taken into account. Then simplification is
done based on the theoretical calculation and experiments, which shows
that both filling and exhausting process could be divided into two
stages according to the value of the pressure. The first stage is that
the pressure rises or drops 99% of the whole value that to rise or drop,
the polytropic exponent could be treated as a constant between 1.0 and
1.4, the rest of the filling or exhausting process is the second stage,
and the polytropic exponent could be treated as 0 since the second stage
could be treated as isobaric one. This method takes both heat transfer
and the varying of polytropic exponent into account, and thus is more
precious to describe a pneumatic system.
Key words: Pneumatic system Filling and exhausting process
Polytropic exponent Simplification Experiment
CLC No: TH138
国家自然科学基金资助项目(59375183).
Received 20040820, received in revised form 20050128
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