The Effect of Pressure Losses on Measured Compressor Efficiency
While measuring the compressor behavior at
different load points in for example a gas stand, the inlet and
outlet pressures are not always measured directly before and
after the compressor. The friction inside the pipes and the
physical piping configuration affect the measured compressor
efficiency, due to the induced change of fluid enthalpy. If
the measured pressures at the end of the inlet and outlet
pipes are not the same as the actual pressure before and
after the compressor, the acquired compressor map does not
give the right description of it as an isolated component.
The main contribution of this paper is the analysis of the
impact of gas stand energy losses due to pipe friction on the
compressor map. As a result the paper suggests a way to take
the pressure losses in the inlet and outlet pipes into account.
The suggested model takes pipe friction, diffuser, nozzle and
pipe bends into account. The potential measurement error
in compressor efficiency due to energy losses in the pipes
in this experiment is 2.7% (percentage points) at maximum
mass flow of air through the compressor.
Kristoffer Ekberg and Lars Eriksson
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Last updated: 2019-12-17