Current research at the Institute of Jet Propulsion focuses on the design and optimiza- tion of s-shaped engine inlet con gurations. The distorted ow caused within such inlet ducts should be limited to ensure an optimal performance, stability, and durability of the engines compressor system. Direct-connect experiments at the engine test bed of the In- stitute of Jet Propulsion with s-shaped engine inlets are in preparation. A measurement rake will be utilized during these experiments to determine the ow distortion entering the gas turbine engine. The in uence of the number as well as the positioning of pressure probes within the rake on the evaluation of both pressure and swirl distortion is therefore investigated. The Society of Automotive Engineers1 recommends the use of a measurement rake comprising 40 probes covering equally area-weighted arc segments. The current work shows that pressure distortion analysis with this speci c rake design leads to fairly good results, though the use of such a rake can lead to large errors when swirl distortion is analyzed. The presented results will moreover be used to de ne an optimized operating procedure with a traversable measurement rake during experimental investigations at the institute's engine test bed to reduce engine operating time and assure a secure operation of test vehicles.    «

Current research at the Institute of Jet Propulsion focuses on the design and optimiza- tion of s-shaped engine inlet con gurations. The distorted ow caused within such inlet ducts should be limited to ensure an optimal performance, stability, and durability of the engines compressor system. Direct-connect experiments at the engine test bed of the In- stitute of Jet Propulsion with s-shaped engine inlets are in preparation. A measurement rake will be utilized during these experimen...    »