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Philip Bear Thesis.pdf (4.51 MB)

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On the Experimental Evaluation of Loss Production and Reduction in a Highly Loaded Low Pressure Turbine Cascade

Bear, Philip Steven
http://orcid.org/0000-0002-8402-5189
http://rave.ohiolink.edu/etdc/view?acc_num=wright148464084439115

Abstract Details

2016, Master of Science in Mechanical Engineering (MSME), Wright State University, Mechanical Engineering.
Improvements in turbine design methods have resulted in the development of blade profiles with both high lift and good Reynolds lapse characteristics. An increase in aerodynamic loading of blades in the low pressure turbine section of aircraft gas turbine engines has the potential to reduce engine weight or increase power extraction. Increased blade loading means larger pressure gradients and increased secondary losses near the endwall. Prior work has emphasized the importance of reducing these losses if highly loaded blades are to be utilized. The present study analyzes the secondary flow field of the front-loaded low-pressure turbine blade designated L2F with and without blade profile contouring at the junction of the blade and endwall. The current work explores the loss production mechanisms inside the low pressure turbine cascade. Stereoscopic particle image velocimetry data, total pressure loss data and oil flow visualization are used to describe the secondary flow field. The flow is analyzed in terms of total pressure loss, vorticity, Q-Criterion, Reynolds’ stresses, turbulence intensity and turbulence production. The flow description is then expanded upon using an Implicit Large Eddy Simulation of the flow field. The RANS momentum equations contain terms with static pressure derivatives. With some manipulation these equations can be rearranged to form an equation for the change in total pressure along a streamline as a function of velocity only. After simplifying for the flow field in question the equation can be interpreted as the total pressure transport along a streamline. A comparison of the total pressure transport calculated from the velocity components and the total pressure loss is presented and discussed. Peak values of total pressure transport overlap peak values of total pressure loss through and downstream of the passage suggesting that total pressure transport is a useful tool for localizing and predicting loss origins and loss development using velocity data which can be obtained non-intrusively.
Mitch Wolff, Ph.D. (Advisor)
Rolf Sondergaard, Ph.D. (Committee Member)
Rory Roberts, Ph.D. (Committee Member)
83 p.
Aerospace Engineering; Engineering
turbines; PIV; SPIV; particle image velocimetry; low pressure turbines; high lift turbines; total pressure loss; experimental measurements; aerodynamics; total pressure transport; turbulent flow; reynolds stress; turbulence production; deformation work

Recommended Citations

Citations

  • Bear, P. S. (2016). On the Experimental Evaluation of Loss Production and Reduction in a Highly Loaded Low Pressure Turbine Cascade [Master's thesis, Wright State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=wright148464084439115

    APA Style (7th edition)

  • Bear, Philip. On the Experimental Evaluation of Loss Production and Reduction in a Highly Loaded Low Pressure Turbine Cascade. 2016. Wright State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=wright148464084439115.

    MLA Style (8th edition)

  • Bear, Philip. "On the Experimental Evaluation of Loss Production and Reduction in a Highly Loaded Low Pressure Turbine Cascade." Master's thesis, Wright State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=wright148464084439115

    Chicago Manual of Style (17th edition)

wright148464084439115
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© 2016, all rights reserved.
This open access ETD is published by Wright State University and OhioLINK.