Väljalaskerõhu ja sisselaskerõhu suhet nimetatakse surveastmeks, mille suurenedes muutub mahuline efektiivsus väiksemaks ja mehaanilise pinge piiramine suuremaks.
Lennunduses on surveaste gaasiturbiinmootori kompressori esi- ja tagaosas mõõtmisel saadud stagnatsioonirõhu mõõdiste suhe.
The ratio of the discharge pressure to the inlet pressure is called the pressure ratio. The volumetric efficiency becomes less, and mechanical stress limitation becomes more, pronounced as pressure ratio increases.
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