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RISTradeoff Assessments for Part Load Controlled Cooling Air in Stationary Gas Turbines
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The demand for flexible part load operation of stationary gas turbines requires the simultaneous design for sufficient efficiency and lifetime. Both can be addressed by the secondary air system. This paper presents ...
An Analysis of the Secondary Flow Around a Tandem Blade Under the Presence of a Tip Gap in a High-Speed Linear Compressor Cascade
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Tandem blades have often been under investigation, experimentally as well as numerically, but most of the studies have been about tandem blade stators without tip gap. This work analyzes the influence of a tip gap on the ...
Prestall Instability in Axial Flow Compressors
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The aim of the present paper is to improve the physical understanding of discrete prestall flow disturbances developing in the tip area of the compressor rotor. For this purpose, a complementary instrumentation was used ...
Experimental Investigations on Aeroelastic Stability of Combined Plunge-Pitch Mode Shapes in a Linear Compressor Cascade
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The effect of mode shape and reduced frequency on the flutter stability of a linear low-speed compressor cascade was investigated experimentally, employing the aerodynamic influence coefficient (AIC) approach. This paper ...
Transition Mechanisms in Laminar Separated Flow Under Simulated Low Pressure Turbine Aerofoil Conditions
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Based on detailed experimental work conducted at a low speed test facility, this paper describes the transition process in the presence of a separation bubble with low Reynolds number, low freestream turbulence, and steady ...
Forcing of Separation Bubbles by Main Flow Unsteadiness or Pulsed Vortex Generating Jets—A Comparison
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Low pressure turbines typically operate in the low Reynolds number regime. Depending on the loading of the blade, they may exhibit detached flow with associated reattachment in the rear part of the suction surface. ...
Binary Repetitive Model Predictive Active Flow Control Applied to an Annular Compressor Stator Cascade With Periodic Disturbances
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Novel pressure gain combustion concepts invoke periodic flow disturbances in a gas turbine's last compressor stator row. This contribution presents studies of mitigation efforts on the effects of these periodic disturbances ...
Numerical Characterization of Prestall Disturbances in a Compressor Stage
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Compared to the subject of rotating stall, less attention has been given to prestall flow disturbances in turbomachinery. This is mostly due to the fact that these phenomena, often referred to as Rotating Instabilities, ...
A Low-Speed Compressor Test Rig for Flutter Investigations
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A test facility for aeroeolastic investigations has been set up at the chair of Aero Engines at the Technische Universität Berlin. The test rig provides data for tool and code validation, and is used for basic aeroelastic ...
Experimental Investigation of an Aerodynamically Mistuned Oscillating Compressor Cascade
Publisher: American Society of Mechanical Engineers (ASME)
Abstract: In this paper, the effect of aerodynamic mistuning on stability of a compressor cascade is studied. The experiments have been carried out at a low-speed test facility of the Technische Universität Berlin. The test section ...