The Importance of Transient Analysis on Internal Combustion Engines Structures

1991 ◽  
Author(s):  
P. A. Drakatos ◽  
S. Haidas
Keyword(s):  
Transient Analysis ◽  
Internal Combustion Engines ◽  
Complex Structure ◽  
Combustion Process ◽  
Combustion Engines ◽  
Vibration Measurements ◽  
Noise And Vibration ◽  
Dynamic Excitation ◽  
Combustion Flow ◽  
Set Up

Abstract Because of difficulties of applying Transient Analysis in complex structure we use a set up of instruments by exploiting the experimental results of known structures of engines. Considering the combustion process as a dynamic excitation, we measure the noise and teh vibration on chosen points on a Spark Ingnition (S.I) engine and a Compression Ingnition engine (C.I). By doing that we come no conclusions concerning the combustion flow. In this experimetnal work appear the spectra of the noise and vibration measurements in connection with the R.P.M. fo the engine. From the comparison between the spectra, we extract important results concerning the chanage of the combustion flow in every different type of engine in several stages. The mesurements have been taken on a S.I. and C.I. engine in Special Engineering Laboratory.

Transient Analysis on Turbo Engine Combustion Flow

1991 ◽  
Author(s):  
P. A. Drakatos ◽  
G. Giannaras ◽  
A. Argyriou ◽  
T. Andriotis
Keyword(s):  
Transient Analysis ◽  
Technical Problem ◽  
Combustion Process ◽  
Military Aircraft ◽  
Noise And Vibration ◽  
Dynamic Excitation ◽  
Noise Structure ◽  
Engine Combustion ◽  
Combustion Flow ◽  
Turbo Engine

Abstract One of the most important technical problem is the moniroting of the combustion flow, concerning the aircraft turbo-engine during its continuous operation. Considering the combustion process as a dynamic excitation, we measure the noise and the vibration on chosen points on the engine. By doing that we come to conclusions concerning the combustion flow. In this experimental work appear the spectra of the noise and vibration measurements as a parameters of engine revolutions (R.P.M.). The spectra of random combustion forces and spectra of noise and vibration borne noise structure are investigates using transient analysis. Their analysis by P.C. and the construction 3-D diagrams which combine the noise level, the vibration level and the R.P.M., give us important information about the interdependance of the above sizes and the combustion flow. The measurements take place on the F-104 G Starfighter aircraft with the General Electric-J79 turboengine, which is the oldest military aircraft in today use.

Research on Structure Optimization of the Engine Using Noise and Vibration Analysis

1991 ◽  
Author(s):  
P. A. Drakatos ◽  
S. P. Drakatos
Keyword(s):  
Vibration Analysis ◽  
Combustion Engine ◽  
Combustion Process ◽  
Structure Optimization ◽  
Continuous Operation ◽  
Soy Oil ◽  
Noise And Vibration ◽  
Operation Optimization ◽  
Dynamic Excitation ◽  
Combustion Flow

Abstract One of the useful problems in the engines is its operation optimization. During combustion we use mixture of oil and soy-oil in a stroke internal combustion engine (S.I.C.E. during its continuous operation. Considering the combustion process as a dynamic excitation, we measure the noise and the vibration on chosen points on a S.I.C.E. By doing that we come to conclusions concerning the combustion flow. In this experimental work appear the spectra of the noise and vibration measurements in connection with the R.P.M. of the engine. The comparison between the diagrams in the case of the simple combustion and the comubstion of the mixture give us important information about the influence of mixutre in the S.I.C.E. So, we can have results on the structure optimization of the engines.

Fluid Motion Within the Cylinder of Internal Combustion Engines—The 1986 Freeman Scholar Lecture

1987 ◽  
Vol 109 (1) ◽  
pp. 3-35 ◽  
Author(s):  
John B. Heywood
Keyword(s):  
Internal Combustion Engines ◽  
Large Scale ◽  
Combustion Process ◽  
Internal Combustion ◽  
Spark Ignition ◽  
Background Information ◽  
Combustion Engines ◽  
Engine Operation ◽  
Set Up ◽  
Stroke Cycle

The flow field within the cylinder of internal combustion engines is the most important factor controlling the combustion process. Thus it has a major impact on engine operation. This paper reviews those aspects of gas motion into, within, and out of the engine cylinder that govern the combustion characteristics and breathing capabilities of spark-ignition engines and compression-ignition or diesel engines. Necessary background information on reciprocating engine operating cycles, the primary effect of piston motion and the spark-ignition and diesel engine combustion processes is first summarized. Then the characteristics of flow through inlet and exhaust valves in four-stroke cycle engines, and through ports in the cylinder liner in two-stroke cycle engines are reviewed. These flows govern the airflow through the engine, and set up the in-cylinder flow that controls the subsequent combustion process. The essential features of common in-cylinder flows—the large scale rotating flows set up by the conical intake jet, the creation and development of swirl about the cylinder axis, the flows produced during compression due to combustion chamber shape called squish, flow during the combustion process, and two-stroke scavenging flows—are then described. The turbulence characteristics of these flows are then defined and discussed. Finally, flow phenomena which occur near the walls, which are important to heat transfer and hydrocarbon emissions phenomena, are reviewed. The primary emphasis is on developing insight regarding these important flow phemomena which occur within the cylinder. To this end, results from many different research techniques—experimental and computational, established and new—have been used as resources. It is the rapidly increasing convergence of engine flow information from these many sources that make this an exciting topic with promise of significant practical contributions.

scholarly journals Hydrogen application in internal combustion engines

2020 ◽  
Vol 21 (1) ◽  
pp. 14-19
Author(s):  
Arthur R. Asoyan ◽  
Igor K. Danilov ◽  
Igor A. Asoyan ◽  
Georgy M. Polishchuk
Keyword(s):  
Burning Rate ◽  
Internal Combustion Engines ◽  
Combustion Process ◽  
Hydrocarbon Fuel ◽  
Internal Combustion ◽  
Technical Solution ◽  
Combustion Engines ◽  
Environmental Friendliness ◽  
Petroleum Origin ◽  
Order Of Magnitude

A technical solution has been proposed to reduce the consumption of basic hydrocarbon fuel, to improve the technical, economic and environmental performance of internal combustion engines by affecting the combustion process of the fuel-air mixture with a minimum effective mass fraction of hydrogen additive in the fuel-air mixture. The burning rate of hydrogen-air mixtures is an order of magnitude greater than the burning rate of similar mixtures based on gasoline or diesel fuel, compared with the former, they are favorably distinguished by their greater detonation stability. With minimal additions of hydrogen to the fuel-air charge, its combustion time is significantly reduced, since hydrogen, having previously mixed with a portion of the air entering the cylinder and burning itself, effectively ignites the mixture in its entirety. Issues related to the accumulation of hydrogen on board the car, its storage, explosion safety, etc., significantly inhibit the development of mass production of cars using hydrogen fuel. The described technical solution allows the generation of hydrogen on board the car and without accumulation to use it as an additive to the main fuel in internal combustion engines. The technical result is to reduce the consumption of hydrocarbon fuels (of petroleum origin) and increase the environmental friendliness of the car due to the reduction of the emission of harmful substances in exhaust gases.

scholarly journals Assessment of thermodynamic cycle of internal combustion engine in terms of rightsizing

2019 ◽  
Vol 178 (3) ◽  
pp. 182-186
Author(s):  
Zbigniew SROKA ◽  
Maciej DWORACZYŃSKI
Keyword(s):  
Internal Combustion Engine ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Combustion Process ◽  
Thermodynamic Cycle ◽  
Internal Combustion ◽  
Research Problem ◽  
Combustion Engines ◽  
Operating Characteristics ◽  
Swept Volume

The modification of the downsizing trend of internal combustion engines towards rightsizing is a new challenge for constructors. The change in the displacement volume of internal combustion engines accompanying the rightsizing idea may in fact mean a reduction or increase of the defining swept volume change factors and thus may affect the change in the operating characteristics as a result of changes in combustion process parameters - a research problem described in this publication. Incidents of changes in the displacement volume were considered along with the change of the compression space and at the change of the geometric degree of compression. The new form of the mathematical dependence describing the efficiency of the thermodynamic cycle makes it possible to evaluate the opera-tion indicators of the internal combustion engine along with the implementation of the rightsizing idea. The work demonstrated the in-variance of cycle efficiency with different forms of rightsizing.

LO.CO.MO.DIA: Low Cost Monitoring for Diagnostic Purposes of a Small Scale CHP Plant

2000 ◽  
Author(s):  
Francesco Fantozzi ◽  
Umberto Desideri
Keyword(s):  
Data Acquisition ◽  
Internal Combustion Engines ◽  
Low Cost ◽  
Small Scale ◽  
Combustion Engines ◽  
Performance Indexes ◽  
Data Acquisition Board ◽  
Set Up ◽  
The University ◽  
Maintenance Personnel

Abstract Small scale Internal Combustion Engines (ICE) powered Combined Heat and Power (CHP) plants are economically convenient when availability and efficiencies are above specified limits. Nevertheless these plants are often run without a monitoring device capable of data storing and trending and of performance evaluation. This paper describes the setting up of a powerful low-cost monitoring system for the CHP plant that powers the School of Engineering of the University of Perugia. Data acquisition is performed by interfacing a Personal Computer (PC) to existing control panels via, serial port, and to a data acquisition board for those variables that are not measured by existing devices. Performance indexes are then calculated via software. Alarms and controls are stored as well to set up a database for diagnostic purposes. The monitoring itself has already shown its troubleshooting capability in interface to maintenance personnel: history trending of variables speeds up the phase of failure identification because it eliminates those possibilities that are negated by cross referencing values of different variables.

scholarly journals Analysis of thermodynamic parameters in spark ignition VCR engine

2019 ◽  
Vol 294 ◽  
pp. 05001
Author(s):  
Patryk Urbański ◽  
Maciej Bajerlein ◽  
Jerzy Merkisz ◽  
Andrzej Ziółkowski ◽  
Dawid Gallas
Keyword(s):  
Thermodynamic Parameters ◽  
Motion Analysis ◽  
Internal Combustion Engines ◽  
Initial Conditions ◽  
Combustion Process ◽  
Internal Combustion ◽  
3D Models ◽  
Spark Ignition ◽  
Combustion Engines ◽  
Combustion Processes

3D models of Szymkowiak and conventional engines were created in the Solidworks program. During the motion analysis, the characteristics of the piston path were analyzed for the two considered engine units. The imported file with the generated piston routes was used in the AVL Fire program, which simulated combustion processes in the two engines with identical initial conditions. The configurations for two different compression ratios were taken into account. The basic thermodynamic parameters occurring during the combustion process in internal combustion engines were analyzed.

scholarly journals Energetic Analysis of the Aircraft Diesel Engine

2019 ◽  
Vol 252 ◽  
pp. 05012
Author(s):  
Łukasz Grabowski ◽  
Konrad Pietrykowski ◽  
Paweł Karpiński
Keyword(s):  
Steady State ◽  
Diesel Engine ◽  
Energy Balance ◽  
Internal Combustion Engines ◽  
Combustion Process ◽  
Energy Losses ◽  
Exhaust Gas ◽  
Combustion Engines ◽  
Engine Model ◽  
Energetic Analysis

The analysis of the distribution of thermal energy generated during the combustion process in internal combustion engines and the estimation of individual losses are important regarding performance and efficiency. The article analyses the energy balance of the designed two-stroke opposed piston diesel engines with offset, i.e. the angle by which the crankshaft at the side of exhaust ports is ahead of the crankshaft at the side of intake ports. Based on the developed zero-dimensional engine model, a series of simulations were performed in steady-state conditions using the AVL BOOST software. The values of individual energy losses, including cooling losses, exhaust gas losses, friction losses were obtained. The influence of decreasing and increasing the offset on the performance of the tested engine was analysed.

scholarly journals Thermodynamic modeling of combustion process of the internal combustion engines – an overview

2019 ◽  
Vol 178 (3) ◽  
pp. 27-37 ◽  
Author(s):  
Denys STEPANENKO ◽  
Zbigniew KNEBA
Keyword(s):  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Combustion Process ◽  
Engine Performance ◽  
Internal Combustion ◽  
Air Pollutant ◽  
Combustion Engines ◽  
Engine Simulation ◽  
Toxic Emissions ◽  
The Moment

The mathematical description of combustion process in the internal combustion engines is a very difficult task, due to the variety of phenomena that occurring in the engine from the moment when the fuel-air mixture ignites up to the moment when intake and exhaust valves beginning open. Modeling of the combustion process plays an important role in the engine simulation, which allows to predict in-cylinder pressure during the combustion, engine performance and environmental impact with high accuracy. The toxic emissions, which appears as a result of fuels combustion, are one of the main environmental problem and as a result the air pollutant regulations are increasingly stringent, what makes the investigation of the combustion process to be a relevant task.

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