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RISThe Reduction of Over Tip Leakage Loss in Unshrouded Axial Turbines Using Winglets and Squealers
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The possibilities of reducing the over tip leakage loss of unshrouded rotors have been investigated using a linear cascade of turbine blades and computational fluid dynamics (CFD). The largescale blade profile is the same ...
Aerothermal Impact of the Interaction Between Hub Leakage and Mainstream Flows in Highly Loaded High Pressure Turbine Blades
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper describes experimental and numerical investigations of a highlyloaded rotor blade with leakage (purge) flow injection through an upstream overlapping seal. The effects of both leakage mass flow rates and swirl ...
The Effects of a Parametric Variation of the Rim Seal Geometry on the Interaction Between Hub Leakage and Mainstream Flows in High Pressure Turbines
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The objective of this work was to assess and understand the effects of a parametric variation performed on a typical overlapping rim seal geometry. The datum geometry has been the focus of a detailed experimental investigation ...
Blade Loading and Its Application in the Mean Line Design of Low Pressure Turbines
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In order to minimize the number of iterations to a turbine design, reasonable choices of the key parameters must be made at the preliminary design stage. The choice of blade loading is of particular concern in the low ...
Unsteady Interaction Between Annulus and Turbine Rim Seal Flows
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In core gas turbines relatively cold air is purged through the hub gap between the stator and rotor in order to seal the disk space against flow ingestion from the main annulus. Although the sealing mass flow rate is ...
Improving Turbine Stage Efficiency and Sealing Effectiveness Through Modifications of the Rim Seal Geometry
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper presents an investigation of a range of engine realistic rim seals starting from a simple axial seal to different types of overlapping seals. The experiments were performed in a largescale linear cascade equipped ...
The Effects of Trailing Edge Thickness on the Losses of Ultrahigh Lift Low Pressure Turbine Blades
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Experimental, numerical and analytical methods were used to investigate the effects of the blade trailing edge thickness on the profile loss of ultrahighlift lowpressure turbine blades. Two cascades, the T106C and the T2, ...
Effects of Winglet Geometry on the Aerodynamic Performance of Tip Leakage Flow in a Turbine Cascade
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Experimental and numerical methods were used to investigate the aerodynamic performance of a winglet tip in a linear cascade. A flat tip and a cavity tip were studied as baseline cases. The flow patterns over the three ...
The Effects of Unsteadiness and Compressibility on the Interaction Between Hub Leakage and Mainstream Flows in High Pressure Turbines
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper investigates the effects of compressibility and unsteadiness due to the relative blade row motion and their importance in the interaction between hub leakage (purge) and mainstream flows. First, the challenges ...
Winglets for Improved Aerothermal Performance of High Pressure Turbines
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper investigates the design of winglet tips for unshrouded high pressure turbine rotors considering aerodynamic and thermal performance simultaneously. A novel parameterization method has been developed to alter the ...