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- W2586249637 abstract "Steady state, inter row measurements in multistage axial compressors are relevantto the current design process. The objective in obtaining such data is for evaluationof compressor blading as well as validation for the computer programmes used incompressor design. Multi-hole pressure probes are a reliable and economical methodof collecting detailed flowfield data in compressors for these purposes.These probes are calibrated in a uniform flow in a wind tunnel prior to use, todetermine their response to a range of flow angles and speeds. When the probe issubsequently used for measurements in the compressor, often the small inter rowspacing means that the probe has to be close to the downstream stator passage andupstream rotor. The result is that the probe is no longer situated in the uniformflow in which it was calibrated, in terms of influences from both the upstream rotorand downstream stator. This project presents the investigation of these two effectson steady state pressure probe measurements.The effects of blockage on a probe positioned in front of a stator row in a highspeed compressor were studied using CFD. This was also carried out on a large scaleprobe in a low speed compressor. It was found that the blockage effect caused areduced mass flow in the downstream stator passage which in turn lead to an alteredflow angle and a small reduction in measured total pressure. Experimental in rigcalibrations showed that the change in flow angle was due to an angular offset ofthe pressure distribution about the probe. These calibrations also showed that thewind tunnel calibration was valid in the compressor within a small angular range.The influence of the upstream rotor passing was studied using an unsteady CFDmodel. Responses of the individual probe ports and the deduced flow angle andtotal pressure indicated that the steady state blockage effect is present throughoutthe wake passing. The wake passing was found to be a largely two dimensional effectin that the radial flow component changes in the low speed compressor wakes hadlittle influence.The Total Technology thesis incorporates a management project on the relevanttopic of project selection within companies. An existing project selection model wasapplied to a sample group of projects to determine the applicability of such models.The main findings were that these models can generate useful information for furtherselection decisions and that the applicability is towards lower budget projects wherea structured approach is often not used." @default.
- W2586249637 created "2017-02-17" @default.
- W2586249637 creator A5089553978 @default.
- W2586249637 date "2003-04-01" @default.
- W2586249637 modified "2023-09-23" @default.
- W2586249637 title "Influence of blade row aerodynamics on pneumatic gas turbine instrumentation" @default.
- W2586249637 hasPublicationYear "2003" @default.
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