Thermal Characterization of Combustion Chamber Components in a Gasoline Turbocharged Direct Injection (GTDI) Engine PDF Download
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Author: Daniel P. Madison
Publisher:
ISBN:
Category : Engines
Languages : en
Pages : 67
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Book Description
The proposed research will analyze the effects of engine speed, load, relative air-fuel ratio (AFR), and exhaust gas recirculation (EGR) on both in-cylinder and global temperature and heat transfer distributions. Additionally, the effect of knocking combustion and fuel spray impingement will be investigated. The proposed research will be conducted on a 3.5 L six cylinder GTDI engine. The research engine will be instrumented with a large number of sensors to measure in-cylinder temperatures and pressures, as well as, the temperature, pressure, and flow rates of energy streams into and out of the engine. One of the goals of this research is to create a model that will predict the energy distribution to the crankshaft, exhaust, and cooling system based on normalized values for engine speed, load, AFR, and EGR. The results could be used to aid in the engine design phase for turbocharger and cooling system sizing. Additionally, the data collected can be used for validation of engine simulation models, since in-cylinder temperature and heat flux data is not readily available in the literature.
Author: Daniel P. Madison
Publisher:
ISBN:
Category : Engines
Languages : en
Pages : 67
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Book Description
The proposed research will analyze the effects of engine speed, load, relative air-fuel ratio (AFR), and exhaust gas recirculation (EGR) on both in-cylinder and global temperature and heat transfer distributions. Additionally, the effect of knocking combustion and fuel spray impingement will be investigated. The proposed research will be conducted on a 3.5 L six cylinder GTDI engine. The research engine will be instrumented with a large number of sensors to measure in-cylinder temperatures and pressures, as well as, the temperature, pressure, and flow rates of energy streams into and out of the engine. One of the goals of this research is to create a model that will predict the energy distribution to the crankshaft, exhaust, and cooling system based on normalized values for engine speed, load, AFR, and EGR. The results could be used to aid in the engine design phase for turbocharger and cooling system sizing. Additionally, the data collected can be used for validation of engine simulation models, since in-cylinder temperature and heat flux data is not readily available in the literature.
Author: Daniel P. Madison
Publisher:
ISBN:
Category : Engines
Languages : en
Pages : 153
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Book Description
Note: The material contained in this section is planned for submission as part of a journal article and/or conference paper in the future.
Author: Henrik Hoffmeyer
Publisher: Logos Verlag Berlin GmbH
ISBN: 3832530797
Category : Technology & Engineering
Languages : en
Pages : 193
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Book Description
In spite of progress in the development of alternative powertrain systems and energy sources, the internal combustion and all its derivates still are and will be the main powertrain for automobiles. In SI-engines, several approaches compete with each other like the controlled auto ignition (CAI or HCCI), throttle-free load control using variable valvetrains, stratified mixture formation with lean engine operation or highly turbo charged downsizing concepts all combined with gasoline direct injection. The presented work makes a contribution for a deeper understanding of the combustion process of a turbo charged direct injection engine operating with external EGR as well as lean stratified mixture. Using detailed test bench investigations and introducing a new optical measurement tool, the combustion process is described in detail focusing on the occurrence of non-premixed combustion phenomena. The influence of engine parameters like global and local air-/fuel ratio, external EGR and fuel rail pressure as well as the influence of fuel parameters are discussed giving a characterization of the combustion process of stratified engine operation. Furthermore, the influences of non-inert exhaust gas components on engine knock tendency are investigated using external EGR with an EGR catalyst. Opposing the results to numerical analysis, combustion characteristics of turbo charged DISI-engines are presented.
Author: Kuk-Won Cho
Publisher:
ISBN:
Category :
Languages : en
Pages : 452
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Book Description
Author: Mohd Fauzie Ramli
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 46
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Book Description
This thesis deals with thermal analysis in internal combustion engine. The objective of this thesis is to develop finite element model of combustion chamber for thermal analysis, to obtain the temperature distribution in combustion chamber and its surrounding component, and to determine localized temperature region in the engine.Finite element method (FEM) was employed to develop computational model to analyze the temperature distribution in the engine components and to identify the critical temperature in the components. Computational domain consists of combustion chamber as major part and its surrounding components such as valves, and exhaust port and water jacket. Two types of combustion process were modelled: Spark ignition engine and compression ignition engine. 2-dimensional (2D) simplified models was developed using general-purpose FE code, ALGOR. The element type was 2D element. Material properties were taken from ALGOR library. Heat convection due to the presence of water was defined by convection coefficient. Thermal load due to combustion was defined to all nodes of combustion chamber. The finite element models were analyzed using the thermal transient heat transfer analysis. The finite element model was validated by comparing the maximum temperature at the piston surface with the published result. The results were found to be agreeable. The computed results indicate that the exhaust part may reach the highest maximum temperature in the engine after combustion occurred. In SI engine, the critical component in thermal effect is the cylinder head and for the CI engine is at the piston bowl. Furthermore, the material used to construct the engine part strongly influences the temperature distribution in the engine. Therefore, the performance of the engine at very high temperature can be improved by changing material and design of component. From the analysis, the capability of diesel engine to resist thermal contact is higher compare to gasoline engine because of using higher thermal resistance material with suitable shape and geometry design.
Author: SAE.
Publisher:
ISBN: 9780768017502
Category :
Languages : en
Pages : 220
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Book Description
Author: Junseok Chang
Publisher:
ISBN:
Category :
Languages : en
Pages : 442
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Abstract : Gasoline engines require fuel enrichment at low temperature cranking (cold start) conditions for efficient engine operation. Since the amount of fuel injected is high at cold start to compensate low fuel evaporation, fuel sprays tend to impinge on the cold surfaces of the piston and cylinder walls leading to the formation of excessive unburned hydrocarbons. One of the ways to ensure reliable cold start performance and to reduce UHC emissions is to have the fuel subjected to preheating. The objective of this study is to investigate the effects of fuel preheating on Gasoline Direct Injection sprays to improve the mixture preparation during the cold start conditions. Injection of fuel sprays of neat gasoline and gasoline-ethanol blends (E10 and E85) from the heater-injector into a constant volume combustion chamber was studied. Computational Fluid Dynamics (CFD) simulations of the fuel flow through the injector were performed to understand the impact of the heater in improving the mixture preparation quality. The gasoline was modelled with 14 component surrogate fuel model to capture its physical properties and distillation characteristics. Fuel spray processes in the Constant Volume Combustion Chamber (CVCC) were simulated using an in-house CFD code, MTU-KIVA. Parametric simulations were performed at different injection pressures and at a wide range of fuel temperature ranging from -6°C to 250°C. The simulation of injector internal flow could improve the spray simulations in the CVCC by providing accurate velocity and temperature distributions of fuel sprays at the exit of individual nozzles. The results show that the injector with the preheating system performs reliably at cold start conditions to increase the fuel temperature from -6°C to 75°C in less than a second. The spray were in good agreement between the measurements and predictions. For the given operating range, the spray changes from normal evaporation to flash boiling regime. The model captures the spray collapsing behaviour for the flash boiling conditions. However, the model tends to over-predict the spray penetration for fuel temperatures in the higher range of boiling/flash boiling, regardless of the injection pressure variation.
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 816
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Author:
Publisher: SAE International
ISBN:
Category : Science
Languages : en
Pages : 212
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Book Description
