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RISPlausibility Study of Hecto Pressure Ratio Concepts in Large Civil Aero-Engines
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Enabling high overall pressure ratios (OPR), wave rotors, and piston concepts (PCs) seem to be solutions surpassing gas turbine efficiency. Therefore, a comparison of a wave rotor and three PCs relative to a reference gas ...
Comparison of Piston Concept Design Solutions for Composite Cycle Engines—Part I: Similarity Considerations
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Composite cycle engines comprising piston engines (PEs) as well as piston compressors (PCs) to achieve hecto pressure ratios represent a target area of current research surpassing gas turbine efficiency. An unclear broad ...
Experimental Identification of Steady-State Turbomachinery Heat Transfer Using Nondimensional Groups
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Diabatic performance modeling is a prerequisite for engine condition monitoring based on nonsteady-state data points (e.g., Putz et al. 2017, “Jet Engine Gas Path Analysis Based on Takeoff Performance Snapshots,” ASME J. ...
Altitude Test Facility Humidity Control to Generate Defined Icing Conditions
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In altitude test facility (ATF) operation, the requirements to control humidity to generate defined icing conditions are gaining more and more importance. In this context, the ability to predict humidity and condensation ...
Estimation of Aircraft Engine Flight Mission Severity Caused by Erosion
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: More and more attention is being devoted to assessing severity of the engine operation for a high number of flights in a minimum of time. Compressor erosion is one of the physical phenomena contributing to this severity. ...
Comparison of Piston Concept Design Solutions for Composite Cycle Engines Part II: Design Considerations
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Hecto pressure composite cycle engines with piston engines and piston compressors are potential alternatives to advanced gas turbine engines. The nondimensional groups limiting their design have been introduced and generally ...
Cycle Optimization Potential of Composite Cycle and Turbocompound Aero-Engines
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Fair comparison of future aircraft engine concepts requires the assumption of similar technological risk and a transparent book keeping of losses. A 1000 km and a 7000 km flight mission of a single-aisle airplane similar ...
Effect of Leading Edge Erosion on the Tip Leakage Flow in a Compressor Cascade
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The interaction between tip leakage flow and passage flow in axial compressor blade rows creates complex flow mechanisms that impair flow stability. Caused by erosion of the compressor blades, these flow mechanisms become ...
Experimental and Numerical Investigation of the Mechanical and Aerodynamic Particle Size Effect in High-Speed Erosive Flows
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Aircraft engines are subject to deterioration due to solid particle erosion. The environmental particulates encountered in service often feature broad particle size distributions and a generally large scatter of particle ...
The Effect of Rated Climb Performance on Low Cycle Fatigue of a Civil Turbojet Engine
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Low cycle fatigue (LCF) of jet engine disks is a major contributor to the maintenance costs of an engine. The current industry standard for the analysis of LCF is to use representative flight missions to reflect the ...