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Title: Aerodynamic investigation of different stator designs for a radial inflow turbine
Author: Simpson, Alister Thomas
ISNI:       0000 0001 3412 5088
Awarding Body: Queen's University Belfast
Current Institution: Queen's University Belfast
Date of Award: 2007
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This thesis describes a series of experime~taland numerical investigations into the aerodynamic performance of different stator designs for radial turbines. The first part of the project deals with the evaluation of the relative performance benefits of using a vaneless stator in place of a vaned stator in a radial turbine. Using a commercial CFD code, a series of numerical models were developed of existing test turbine geometries consisting of a common turbine rotor with a series of different vaned and vaneless stator configurations. The results are compared with corresponding measured turbine performance data for a total of six turbine geometries. Steady state predictions showed good agre.ement with the experimental trends confirming the vaneless stators to yield higher efficiencies across the full operating range. Subsequent analysis of the numerical results compared the detailed internal passage flows for both types of stator, showing the vaned stator to incur generally higher overall levels of total pressure loss due to the combined effects of secondary flows, boundary layer growth and wakes from vane trailing edges. Transient analysis successfully captured the variation in rotor inlet flow properties with each stator design, showing the vaneless stators to deliver more uniform flow conditions around the rotor periphery. The second investigation involved the design and analysis of a series of vaned stators for radial turbines to determine the effect of the vane solidity and vaneless space parameter on stage efficiency. The designs were subsequently manufactured and tested as part of a full running turbine stage, and a body of performance data collated from which to guide radial guide vane design. Optimum values of vane solidity and vaneless space parameter were identified.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available