Apparatus for preventing surging of a gas turbine

Abstract

Apparatus for preventing surging of a gas turbine especially for a motor car. According to one embodiment of this invention, the apparatus is provided with its main information which is composed of the differential pressure .DELTA.P between the air immediately inwardly of the air filter of the gas turbine and the air at the compressor inlet. When the differential pressure .DELTA.P reaches approximately the critical value .DELTA.Ps at which surging occurs at each number N of rpm of the gas turbine, i.e., (.DELTA.P - .DELTA.Ps) is almost 0, fuel control means are operative to control the fuel supply to the gas turbine, thereby preventing surging. According to another embodiment, the apparatus is provided with its main information for preventing surging of the gas turbine from the ratio of the differential pressure .DELTA.P between the pressure PIN of the air immediately inwardly of the air filter and the air pressure at the inlet of the compressor to PIN, i.e., .DELTA.P/PIN. When .DELTA.P/PIN reaches approximately the critical value (.DELTA.P/PIN)s at which surging occurs at each N/.sqroot.TIN (N: number of rpm of the gas turbine, T: temperature of the air immediately inwardly of the air filter), i.e., (.DELTA.P/PIN - (.DELTA.P/PIN)s) is almost 0, fuel supply control means become operative to control fuel supply to the gas turbine, thereby preventing surging. As the conditions of the incoming air such as PIN and TIN are taken into consideration, the apparatus according to this invention can prevent surging when the car is driven at a high altitude, when the weather conditions, e.g., PIN or TIN are changeable or when the air filter is clogged.

Dependencies are inferred from the claim text.