Safran Power Units

David Francis Pierre Ormieres

Louis Jean-Paul Fabien Perrot-Minot

An aircraft auxiliary power unit is equipped with a charging compressor. A method determines a surge parameter indicative of a risk that the charging compressor will display the phenomenon known as surge. A method and a system control a relief valve of this charging compressor. The method for determining the surge parameter includes calculating this surge parameter Ppomp as being the sum of a first term Tand of a second term Tthe first term Tbeing calculated on the basis of a first pressure Pmeasured downstream of a diffuser of the charging compressor, and of a second pressure Pmeasured upstream of the diffuser, the second term Tbeing calculated on the basis of a third pressure Pmeasured upstream of the diffuser and of an ambient pressure Psamb indicative of a pressure of an ambient environment.

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Moissy-Cramayel, France

David Francis Pierre Ormieres