An experimental investigation was conducted in an altitude facility to determine the effects of steady-state inlet temperature distortion, pressure distortion, and combined temperature and pressure distortion on the stability of a PW1128 turbofan engine. The steady-state temperature distortion was generated by a gaseous-fueled hydrogen burner. Pressure distortion was produced by a screen installed in the inlet ducting between the burner and the engine inlet. With the exceptions of inlet pressure distortion, a tip-radial inlet temperature distortion at the highest corrected fan speed tested, and combined distortion with the low-pressure and high-temperature regions together, the fan generated a flow instability when operating near its steady-state stall line. In some instances the fan was not the first component to surge, however, because the instability disrupted the flow to the high-pressure compressor causing it to surge at, or near, the same time as the fan. The effect of combined distortion was dependent on the relative locations of the high-temperature and low-pressure regions; high-pressure compressor stall occurred when the distorted regions were together, and fan stall occurred when the distorted regions were diametrically opposed.
Effect of spatial inlet temperature and pressure distortion on turbofan engine stability
Einfluss von raeumlichen Stoerungen der Einlasstemperatur und des Drucks auf die Stabilitaet von Turbopropmaschinen
AIAA-Papers ; Jul ; 1-15
1988
15 Seiten, 20 Bilder, 2 Tabellen, 23 Quellen
Aufsatz (Konferenz)
Englisch
EINFLUSSGROESSE , TEMPERATURABHAENGIGKEIT , DRUCKABHAENGIGKEIT , PROPELLERTURBINENTRIEBWERK , STABILITAET , FLUGVERHALTEN , FLUGZEUG , PRAKTISCHE UNTERSUCHUNG , DRUCKVERTEILUNG , TEMPERATURVERTEILUNG , STROEMUNGSVORGANG , ABREISSEN DER STROEMUNG , WECHSELWIRKUNG , STROEMUNGSVERTEILUNG , RAEUMLICHE ANORDNUNG
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