YaBeSH Digital Library: Recent submissions
Now showing items 13821-13840 of 316660
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Numerical Study on the Potential of Stratified Mixture to Improve Thermal Efficiency and Reduce Carbon Emissions in High-Speed Gasoline Direct Injection Engine
(The American Society of Mechanical Engineers (ASME), 2024)Stratified combustion improves the indicated thermal efficiency (ITE) of gasoline direct injection (GDI) engines, but the mechanism of its impact on unregulated emissions remains unclear. In this simulation-based study, ... -
Numerical Investigation of Effusion Cooling Air Influence on the CO Emissions for a Single-Sector Aero-Engine Model Combustor
(The American Society of Mechanical Engineers (ASME), 2024)Stricter aviation emissions regulations have led to the desire for lean-premixed-vaporized (LPP) combustors over rich–quench–lean (RQL) burners. While this operation mode is beneficial for reducing NOx and particulate ... -
Ignition of Aged Lubricants in a Shock Tube
(The American Society of Mechanical Engineers (ASME), 2024)Lubricants experience harsh conditions which result in degradation of the oil. To imitate similar conditions, Mobil DTE 732, a common gas turbine lubricating oil, was subjected to high temperatures for an extended period ... -
A Reactor-Network Framework to Model Performance and Emissions of a Longitudinally Staged Combustion System for Carbon-Free Fuels
(The American Society of Mechanical Engineers (ASME), 2024)Hydrogen and ammonia are considered crucial carbon-free energy carriers optimally suited for seasonal chemical storage and balancing of the energy system. In this context, longitudinally staged combustion systems represent ... -
Damage to a High Bypass Ratio Fan During Uncrewed Aircraft Systems Ingestions
(The American Society of Mechanical Engineers (ASME), 2024)Foreign object ingestion into engines has been studied for many years, but the focus has been on soft bodies (i.e., birds, ice). Recently, there has been a dramatic increase of uncrewed aircraft systems (UAS) in the airspace ... -
A Dynamic Thickening Strategy for High-Fidelity Computational Fluid Dynamics Analyses of Multi-Regime Combustion
(The American Society of Mechanical Engineers (ASME), 2024)In this study, a dynamic thickening strategy for dynamic thickened flame model for large eddy simulations (DTFLES) application to multi-regime combustion is proposed. The main idea lies in using the numerical solution of ... -
On the Challenges of Integrating a Rotating Detonation Combustor With an Industrial Gas Turbine and Important Design Considerations for Row-1 Blades
(The American Society of Mechanical Engineers (ASME), 2024)In an effort to increase the efficiency and performance of gas turbine power cycles, pressure gain combustion (PGC) has gained significant interest. Since rotating detonation combustors (RDC) can provide a quasi-steady ... -
Using a Mock Circulatory Loop as a Regulatory Science Tool to Simulate Different Heart Failure Conditions
(The American Society of Mechanical Engineers (ASME), 2023)Mechanical circulatory support (MCS) device therapy is one of the primary treatment options for end-stage heart failure (HF), whereby a mechanical pump is integrated with the failing heart to maintain adequate tissue ... -
Dynamical Systems Characterization and Reduced Order Modeling of Thermoacoustics in a Lean Direct Injection Hydrogen Combustor
(The American Society of Mechanical Engineers (ASME), 2024)Hydrogen is a promising zero-carbon fuel for decarbonized energy and transportation sectors. While carbon emission is not a concern for hydrogen combustion, its higher adiabatic flame temperature poses challenges of ... -
Experimental Study of High-Diodicity Inlet Effects on Rotating Detonation Combustor Performance and Operability
(The American Society of Mechanical Engineers (ASME), 2024)Implementing high-diodicity inlets is critical to reduce backflow and mitigate the pressure loss across the injector in rotating detonation combustors (RDCs). Experiments on air injection diodicity were conducted in a ... -
The Effect of Mixture Variation and Initial Temperature on the NH2* Thickness of Spherically Propagating Laminar Ammonia Flames
(The American Society of Mechanical Engineers (ASME), 2024)Interest in ammonia (NH3) in combustion has increased in recent years as a carbon-free fuel alternative. Therefore, understanding its combustion characteristics is crucial. One way to increase the knowledge of ammonia ... -
An Optimization Method for Stiffness and Damping Mistuning Identification From Blade Tip Timing Data
(The American Society of Mechanical Engineers (ASME), 2024)System identification of dynamic properties is of large interest in the turbomachinery industry to create more accurate computational models and more effective designs. Previous identification techniques are able to ... -
Quantitative Measurements in the Exhaust Flow of A Rotating Detonation Combustor Using Rainbow Schlieren Deflectometry
(The American Society of Mechanical Engineers (ASME), 2024)This study employs rainbow schlieren deflectometry (RSD) to characterize the unsteady, supersonic/subsonic exhaust plume of a rotating detonation combustor (RDC). First, RSD images are analyzed to quantify the frequency ... -
Performance Characterization of a Radial Rotating Detonation Combustor With Axial Exhaust
(The American Society of Mechanical Engineers (ASME), 2024)This experimental study characterizes the performance of a radial rotating detonation combustor (RDC). An aerospike nozzle for rocket propulsion has been integrated into the center of the combustor, although the same ... -
Performance Evaluation of Different Rotating Detonation Combustor Designs Using Simulations and Experiments
(The American Society of Mechanical Engineers (ASME), 2024)Rotating detonation engines (RDEs) present a potential avenue for enhancing the efficiency of gas turbine combustors through the utilization of a detonation-driven process. However, integrating an RDE with a downstream ... -
Low Swirl Effect on Compact Spray and Combustion Systems Using Additive Manufactured Dual Airblast Injectors
(The American Society of Mechanical Engineers (ASME), 2024)Novel low swirl concepts provide a promising approach to ensure stable flame anchoring over an extensive operation condition range, necessary for optimizing compact designs for liquid fuel combustors as used in hybrid ... -
Advancements in Sustainable Aviation Fuels: Impact of Nano-Additives and Ammonia-Based Strategies on Emissions
(The American Society of Mechanical Engineers (ASME), 2024)Our study investigates the impact of nanoparticulate additives—specifically those based on ammonia and water—on the combustion characteristics of Jet-A1 aviation fuel, using a 300-kW liquid swirl combustor. Experiments ... -
Numerical and Experimental Study of Flow-Induced Vibrations in Micro-Tube Heat Exchangers
(The American Society of Mechanical Engineers (ASME), 2024)Thermal management presents an increasing challenge in future engineering systems, especially in applications like combined cycle precooling, waste heat recovery, and innovative propulsion systems. These systems face a ... -
A Procedure for the Static Design of Activated Carbon-Filled Air Springs
(The American Society of Mechanical Engineers (ASME), 2024)Compared to conventional coil springs in passenger vehicles, air springs allow the vehicle body to be leveled independently of the load while maintaining an almost constant spring rate. However, while vehicle masses are ... -
An Aero-Engine Disk Sizing and Weight Estimation Approach With Improved Temperature Profiles
(The American Society of Mechanical Engineers (ASME), 2024)During the predesign phase of an aero-engine, interdisciplinary parametric studies are crucial for identifying an optimum engine. As innovative engine concepts emerge, it is essential to study trends aiming to minimize ...