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RISComparison of Large Eddy Simulation and Unsteady Reynolds-Averaged Navier–Stokes for Evaluation of Entropy Noise
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper expands on the numerical simulation of entropy noise by performing a comparison of two commonly used models for resolving turbulent flow field: large eddy simulation (LES) and unsteady Reynolds-averaged Navier–Stokes ...
Improved Methodologies for Time Resolved Heat Transfer Measurements, Demonstrated on an Unshrouded Transonic Turbine Casing
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The high pressure (HP) rotor tip and overtip casing are often lifelimiting features in the turbine stages of current gas turbine engines. This is due to the high thermal load and high temperature cycling at both low and ...
Understanding Thermal Unsteadiness in Engine Representative Flows and Improved Methodologies for Derived Heat Transfer Calculations Using Thin-Film Gauges
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The Oxford Turbine Research Facility (OTRF) is a high-speed rotating transient test facility, which allows unsteady aerodynamic and heat transfer measurements at engine representative conditions. In addition, a variety of ...
Effect of Low-NOX Combustor Swirl Clocking on Intermediate Turbine Duct Vane Aerodynamics With an Upstream High Pressure Turbine Stage—An Experimental and Computational Study
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Flow in an intermediate turbine duct (ITD) is highly complex, influenced by the upstream turbine stage flow structures, which include tip leakage flow and nonuniformities originating from the upstream high pressure turbine ...
Design of a Nonreacting Combustor Simulator With Swirl and Temperature Distortion With Experimental Validation
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Nonuniform combustor outlet flows have been demonstrated to have significant impact on the first and second stage turbine aerothermal performance. Richburn combustors, which generally have pronounced temperature profiles ...
Unsteady Flow Phenomena in Turbine Rim Seals
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: While turbine rim sealing flows are an important aspect of turbomachinery design, affecting turbine aerodynamic performance and turbine disk temperatures, the present understanding and predictive capability for such flows ...
Investigation of a HighPressure Turbine Stage in a HighSpeed Rotating Transient Test Facility for Rotor Tip Study and a Parametric Study for Improved Heat Transfer Calculation
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The first part of the paper presents commissioning of a singlestage highpressure (HP) turbine employed in a series of extensive experiments to study the aerodynamics and heat transfer on the rotor surface and casing liner. ...
An Aerodynamic Investigation of a High-Pressure Turbine Using Rotor Casing Static Pressure Measurements at Engine Representative Conditions With Different Tip Designs, Tip Gaps, and Inlet Temperature Profiles
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A rotating high-pressure (HP) turbine, in modern aircraft engines, is subjected to high cyclic thermal and mechanical loads. Shroudless turbines experience high heat loads on the rotor tip and casing, which makes them one ...
Impact of Rotor-Casing Effusion Cooling on Turbine Performance and Operating Point: An Experimental, Computational, and Theoretical Study
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: It is known that a secondary effect of rotor-casing effusion cooling is to modify and potentially spoil the rotor over-tip leakage flow. Studies have shown both positive and negative impacts on high-pressure (HP) stage ...
Commissioning of a Combined Hot-Streak and Swirl Profile Generator in a Transonic Turbine Test Facility
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: By enhancing the premixing of fuel and air prior to combustion, recently developed lean-burn combustor systems have led to reduced NOx and particulate emissions in gas turbines. Lean-burn combustor exit flows are typically ...