Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 1741-1760 of 9564
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Investigation of the Boundary Layer Flow Under Engine-Like Conditions Using Particle Image Velocimetry
(American Society of Mechanical Engineers (ASME), 2019)The turbulent boundary layer flow in internal combustion (IC) engines has a significant effect on the in-cylinder flow and the wall heat transfer. A detailed analysis of the in-cylinder near-wall flow was carried out on ... -
Performance Comparison of a Single Cylinder and a Dual Cylinder Free Piston Engine
(American Society of Mechanical Engineers (ASME), 2019)Free piston linear engine alternators (FPLEA) may be designed following several different baseline configurations. Common designs include a translator that carries permanent magnets, with either one piston attached to one ... -
Study of a Cooling Feed Pipe With a Covering Plate on a Ribbed Turbine Case
(American Society of Mechanical Engineers (ASME), 2019)Considering the complicated geometry in an active clearance control (ACC) system, the design of an improved cooling feed pipe with a covering plate for a high pressure ribbed turbine case was investigated. Numerical ... -
Numerical Loss Investigation of a Small Scale, Low Specific Speed Supercritical CO2 Radial Inflow Turbine
(American Society of Mechanical Engineers (ASME), 2019)Radial inflow turbines, characterized by a low specific speed, are a candidate architecture for the supercritical CO2 Brayton cycle at small scale, i.e., less than 5 MW. Prior cycle studies have identified the importance ... -
Large Eddy Simulation of Multiple-Stage Ignition Process of n-Heptane Spray Flame
(American Society of Mechanical Engineers (ASME), 2019)Large eddy simulation of n-heptane spray flames is conducted to investigate the multiple-stage ignition process under extreme (low-temperature, low oxygen, and high-temperature, high-density) conditions. At low oxygen ... -
Design of an Annular-Radial Diffuser for Operation With a Supercritical CO2 Radial Inflow Turbine
(American Society of Mechanical Engineers (ASME), 2019)Radial inflow turbines are a relevant architecture for energy extraction from supercritical CO2 power cycles for scales less than 10 MW. To ensure stage and overall cycle efficiency, it is desirable to recover exhaust ... -
Effects of Squish Flow on Tangential Flow and Turbulence in a Diesel Engine
(American Society of Mechanical Engineers (ASME), 2019)Emission and fuel consumption in swirl-supported diesel engines strongly depend on the in-cylinder turbulent flows. But the physical effects of squish flow on the tangential flow and turbulence production are still far ... -
Comparison of Cylinder Pressure Measurements on a Heavy-Duty Diesel Engine Using a Switching Adapter
(American Society of Mechanical Engineers (ASME), 2019)In this study, a variety of piezoelectric pressure transducer designs and mounting configurations were compared for measuring in-cylinder pressure on a heavy-duty single-cylinder diesel engine. A unique cylinder head design ... -
Application of Variable Valve Actuation Strategies and Direct Gasoline Injection Schemes to Reduce Combustion Harshness and Emissions of Boosted HCCI Engine
(American Society of Mechanical Engineers (ASME), 2019)The present study investigates various measures to reduce pressure rise rates (PRRs) in a residual-affected homogeneous charge compression ignition (HCCI) engine. At the same time, the impact of those measures on efficiency ... -
In-Cylinder CO2 Sampling Using Skip-Firing Method
(American Society of Mechanical Engineers (ASME), 2019)Skip-firing (or cylinder de-activation) was assessed as a method of sampling CO2 directly in the cylinder at higher speeds than previously possible. CO2 was directly sampled from one cylinder of a 1 L three-cylinder gasoline ... -
Development of a Hybrid Lagrangian–Eulerian Model to Describe Spark-Ignition Processes at Engine-Like Turbulent Flow Conditions
(American Society of Mechanical Engineers (ASME), 2019)With the engine technology moving toward more challenging (highly dilute and boosted) operation, spark-ignition processes play a key role in determining flame propagation and completeness of the combustion process. On the ... -
Analysis of Passenger Car Turbocharged Diesel Engines Performance When Tested at Altitude and of the Altitude Simulator Device Used
(American Society of Mechanical Engineers (ASME), 2019)According to current worldwide trends for homologation vehicles in real driving conditions is forced to test the engines in altitude and in highly dynamic driving cycles in order to approach nowadays and next future emissions ... -
Polycyclic Aromatic Hydrocarbons and Soot Emissions in Oxygenated Ethylene Diffusion Flames at Elevated Pressures
(American Society of Mechanical Engineers (ASME), 2019)We report herein a computational study to characterize the effect of oxygenation on polycyclic aromatic hydrocarbons (PAHs) and soot emissions in ethylene diffusion flames at pressures 1–8 atm. Laminar oxygenated flames ... -
Diesel Engine Acoustic Emission Airflow Clogging Diagnostics With Machine Learning
(American Society of Mechanical Engineers (ASME), 2019)A diesel engine electrical generator set (“gen-set”) was instrumented with in-cylinder indicating sensors as well as acoustic emission microphones near the engine. Air filter clogging was emulated by progressive restriction ... -
Effects of Outlier Flow Field on the Characteristics of In-Cylinder Coherent Structures Identified by Proper Orthogonal Decomposition-Based Conditional Averaging and Quadruple Proper Orthogonal Decomposition
(American Society of Mechanical Engineers (ASME), 2019)Proper orthogonal decomposition (POD) offers an approach to quantify cycle-to-cycle variation (CCV) of the flow field inside the internal combustion engine cylinder. POD decomposes instantaneous flow fields (also called ... -
Numerical Study on Fretting Wear of Mating Surface Between Piston Crown and Skirt in Heavy Duty Diesel Engine
(American Society of Mechanical Engineers (ASME), 2019)Composite pistons are often used in heavy duty diesel engines due to its good reliability and durability. Owing to the alternating loads, fretting wear usually happens on the mating surfaces between piston crown and skirt. ... -
A Computational Investigation of Nonpremixed Combustion of Natural Gas Injected Into Mixture of Argon and Oxygen
(American Society of Mechanical Engineers (ASME), 2019)Natural gas is traditionally considered as a promising fuel in comparison with gasoline due to the potential of lower emissions and significant domestic reserves. These emissions can be further diminished by using noble ... -
Investigation of NO2 Formation Kinetics in Dual-Fuel Engines With Lean Premixed Methane–Air Charge
(American Society of Mechanical Engineers (ASME), 2019)A dual fuel engine concept with lean premixed methane–air charge ignited by a diesel pilot flame is highly promising for reducing NOx and soot emissions. One drawback of this combustion method, however, is the high nitric ... -
A Model for Stall and Surge in Low-Speed Contra-Rotating Fans
(American Society of Mechanical Engineers (ASME), 2019)This paper reports on a theory for poststall transients in contra-rotating fans, which is developed from the basic Moore–Greitzer theory. A second-order hysteresis term is assumed for the fan pressure rise, which gives the ... -
Diesel Fuel Multiple Injection Effects on Emission Characteristics of Diesel Engine Mixed Ammonia Gas Into Intake Air
(American Society of Mechanical Engineers (ASME), 2019)This study focuses NH3 as an alternative fuel for internal combustion engines, because NH3 is known as a H2 carrier and its combustion does not produce CO2 causing global warming. On the other hand, some reports show that ...