Λεπτομέρειες βιβλιογραφικής εγγραφής
| Τίτλος: |
ON/OFF FLOW CONTROL FOR HIGHLY LOADED LOW-PRESSURE TURBINES |
| Συγγραφείς: |
Hunter Douglas Nowak |
| Έτος έκδοσης: |
2025 |
| Συλλογή: |
Purdue University Graduate School: Figshare |
| Θεματικοί όροι: |
Computational methods in fluid flow, heat and mass transfer (incl. computational fluid dynamics), Experimental methods in fluid flow, heat and mass transfer, Engineering instrumentation, Low-pressure Turbine, computational fluid dynamic (CFD) model, Computational fluid dynamics -- Data processing, wind tunnel test section, Transonic Aerodynamic Analysis, Transonic airfoils, Low Reynolds number effects, flow control method, turbine aerodynamics |
| Περιγραφή: |
Power extraction for use in the fan and early stages of the compressor occurs in the low-pressure turbine of turbo fan engines. The design envelop of low-pressure turbine airfoils has been pushed to new limits over the last several decades as the power extraction demanded by the low-pressure turbine has increased. A new class of low-pressure turbines, which pushes work extraction per stage and loading per airfoil, has emerged to meet the increased power demanded. In order to characterize the performance of this new class of airfoils a new test article is required. Typically, the midspan performance of airfoils is characterized in linear cascades and the turbine stage performance is characterized in rotating test articles. This new class of airfoil must have drastically different definition at the hub and tip due to the high rotational speed and hub to tip ratio, which leaves the characterization of mid span insufficient to understanding the airfoil characteristics prior to rotor stage testing. This dissertation discusses the development of a new, stationary rig which is capable of the detailed characterization of the flow field created by this new class of turbine airfoils across a wide range Reynolds and Mach numbers. This enduring test asset was commissioned its measurement capability is showcased and its limitations discussed. While the boundaries of low-pressure turbine design have been pushed, a common problem has plagued many of the emergent designs in the same time span. The “Reynolds lapse” phenomenon, where blades experience increased losses at low Reynolds numbers due to bulk separation in the presence of adverse pressure gradients, has been observed in nearly every highly loaded low-pressure turbine airfoil in the last quarter century. In that same period, flow control technologies have been sought out to eliminate bulk separation, and increase performance at low Reynolds numbers. Following the discussion of the new test article, a study to find a suitable flow control method for a member of the ... |
| Τύπος εγγράφου: |
thesis |
| Γλώσσα: |
unknown |
| Relation: |
https://figshare.com/articles/thesis/ON_OFF_FLOW_CONTROL_FOR_HIGHLY_LOADED_LOW-PRESSURE_TURBINES/30827495 |
| DOI: |
10.25394/PGS.30827495.v1 |
| Διαθεσιμότητα: |
https://doi.org/10.25394/PGS.30827495.v1 |
| Rights: |
CC BY 4.0 |
| Αριθμός Καταχώρησης: |
edsbas.1A3DD90E |
| Βάση Δεδομένων: |
BASE |