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RISOn the Mechanism of Spike Stall Inception and Near Stall Nonsynchronous Vibration in an Axial Compressor
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The aerodynamic and aeroelastic behavior of an engine-like transonic compressor stage is investigated in this paper. Simulations were carried out for the transonic compressor at the Technical University of Darmstadt using ...
Measurements of Radial Vortices, Spill Forward, and Vortex Breakdown in a Transonic Compressor
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The phenomena prior to rotating stall were investigated in a high-speed compressor test rig using optical and pneumatic measurement techniques. A number of throttling procedures were performed at transonic and subsonic ...
Uncertainty Propagation Analyses of Lean Burn Combustor Exit Conditions for a Robust Nozzle Cooling Design
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Knowing the flow conditions at the combustor turbine interface is a key asset for an efficient cooling design of high-pressure turbines. However, measurements and numerical predictions of combustor exit conditions are ...
Investigation of the Interaction Between Tip Leakage and Main Annulus Flow in the Large Scale Turbine Rig: Comparison of Different Rotor Tip Geometries
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Shroudless rotor blades are state-of-the-art in modern high pressure turbines. Tip leakage flow has a crucial impact on turbine efficiency. Specific blade tip designs are a key factor to handle tip leakage losses by ...
Film Cooling and Thermal Performances of a Blade Tip Winglet Operated in an Annular Test Rig and a Test Gas Turbine Power Plant
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper investigates the film cooling performances and thermal behavior of a blade tip winglet, which was initially investigated in a 1.5-stage experimental axial turbine facility and subsequently also tested in a gas ...
The Effect of Unsteady Inlet Boundary Conditions on the Aero-Thermal Behavior of High-Pressure Turbine Vanes – A Numerical Study Using Scale-Resolving Simulations
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper presents the application of a novel method to prescribe unsteady boundary conditions to transient, scale-resolving computational fluid dynamics simulations of the high-pressure turbine in modern jet engines. The ...
Transonic Compressor Darmstadt Open Test Case: Experimental Investigation of Stator Secondary Flows and Hub Leakage
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The future trend of clean sky aviation has led to a smaller core engine, resulting in highly loaded stages with increased relative tip gaps and leakage flows, which causes a reinforced influence of secondary flow phenomena. ...
Influence of Combustor Swirl on Endwall Heat Transfer and Film Cooling Effectiveness at the Large Scale Turbine Rig
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: At the large scale turbine rig (LSTR) at Technische Universität Darmstadt, Darmstadt, Germany, the aerothermal interaction of combustor exit flow conditions on the subsequent turbine stage is examined. The rig resembles a ...
Mechanism of Nonsynchronous Blade Vibration in a Transonic Compressor Rig
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper presents a numerical study on blade vibration for the transonic compressor rig at the Technische Universität Darmstadt (TUD), Darmstadt, Germany. The vibration was experimentally observed for the second eigenmode ...
Influence of Rotor Tip Blockage on Near Stall Blade Vibrations in an Axial Compressor Rig
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Rotor blade vibrations observed in the Darmstadt transonic compressor rig are investigated in this paper. The vibrations are nonsynchronous and occur in the near stall (NS) operating region. Rotor tip flow fluctuations ...