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.

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.

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.

Research on Air-Burned Gases Compressible Flow As a Function of Engine Sound Spectrum

1991 ◽  
Author(s):  
P. A. Drakatos ◽  
G. Giannaras ◽  
A. Argyriou ◽  
T. Andriotis
Keyword(s):  
Combustion Chamber ◽  
Compressible Flow ◽  
Experimental Work ◽  
Combustion Process ◽  
Dynamic Excitation ◽  
Engine Combustion ◽  
Noise Measurements ◽  
Combustion Flow ◽  
Sound Spectrum

Abstract The aerodynamic flow resulting from engine combustion flow is researched. Considering the combustion process as a dynamic excitation, we measure the noise and the vibration on chosen points on the burned-gases flow. By doing that we come to conclusions concerning the combustion flow and the after-burning. In this experimental work appear the spectra of the noise measurements in connection with the R.P.M. of the engine. It is tried to find the function of air compressible flow concerned with mechanical situation and combustion flow of the engine. The comparison between the spectra give us important information about the interdependance between the noise and the combustion flow in the combustion chamber and the after burner. The measurements take place on several situation engine.

Analysis and Research of the Combustion Process of YN4100QB Diesel Engine

2013 ◽  
Vol 744 ◽  
pp. 35-39
Author(s):  
Lei Ming Shi ◽  
Guang Hui Jia ◽  
Zhi Fei Zhang ◽  
Zhong Ming Xu
Keyword(s):  
Diesel Engine ◽  
Internal Combustion Engine ◽  
Combustion Chamber ◽  
Optimization Design ◽  
Combustion Engine ◽  
Geometric Model ◽  
Combustion Process ◽  
Internal Combustion ◽  
Engine Combustion ◽  
Exhaust Noise

In order to obtain the foundation to the research on the Diesel Engine YN4100QB combustion process, exhaust, the optimal design of combustion chamber and the useful information for the design of exhaust muffler, the geometric model and mesh model of a type internal combustion engine are constructed by using FIRE software to analyze the working process of internal combustion engine. Exhaust noise is the main component of automobile noise in the study of controlling vehicle noise. It is primary to design a type of muffler which is good for agricultural automobile engine matching and noise reduction effect. The present car mufflers are all development means. So it is bound to cause the long cycle of product development and waste of resources. Even sometimes not only can it not reach the purpose of reducing the noise but also it leads to reduce the engine dynamic. The strength of the exhaust noise is closely related to engine combustion temperature and pressure. The calculation and initial parameters are applied to the software based on the combustion model and theory. According to the specific operation process of internal combustion engine. Five kinds of common operation condition was compiled. It is obtained for the detailed distribution parameters of combusted gas temperature pressure . It is also got for flow velocity of the fields in cylinder and given for the relation of the parameters and crankshaft angle for the further research. At the same time NOx emissions situation are got. The numerical results show that not only does it provide the 3D distribution data in different crank shaft angle inside the cylinder in the simulation of combustion process, but also it provides a basis for the engine combustion ,emission research, the optimization design of the combustion chamber and the useful information for the designs of muffler.

A Control-Oriented Reaction-Based SI Engine Combustion Model

2018 ◽  
Author(s):  
Ruixue C. Li ◽  
Guoming G. Zhu
Keyword(s):  
Chemical Reaction ◽  
Mass Fraction ◽  
Combustion Process ◽  
Combustion Model ◽  
Spark Ignition Engines ◽  
Si Engine ◽  
Chemical Reaction Mechanism ◽  
Engine Combustion ◽  
Rate Of Heat Release ◽  
Mass And Heat Transfer

This paper proposes a control-oriented chemical reaction-based two-zone combustion model designed to accurately describe the combustion process and thermal performance for spark-ignition engines. The combustion chamber is assumed to be divided into two zones: reaction and unburned zones, where the chemical reaction takes place in the reaction zone and the unburned zone contains all the unburned mixture. In contrast to the empirical pre-determined Wiebe-function-based combustion model, an ideal two-step chemical reaction mechanism is used to reliably model the detailed combustion process such as mass-fraction-burned (MFB) and rate of heat release. The interaction between two zones includes mass and heat transfer at the zone interface to have a smooth combustion process. This control-oriented model is extensively calibrated based on the experimental data to demonstrate its capability of predicting the combustion process and thermodynamic states of the in-cylinder mixture.

scholarly journals An Improved Soot Formation Model for 3D Diesel Engine Simulations

2006 ◽  
Vol 129 (3) ◽  
pp. 877-884 ◽  
Author(s):  
Joan Boulanger ◽  
Fengshan Liu ◽  
W. Stuart Neill ◽  
Gregory J. Smallwood
Keyword(s):  
Diesel Engine ◽  
Soot Formation ◽  
Computing Time ◽  
Combustion Process ◽  
Computational Cost ◽  
Wall Region ◽  
Soot Particles ◽  
Engine Combustion ◽  
Near Wall ◽  
Soot Model

Soot formation phenomenon is far from being fully understood today and models available for simulation of soot in practical combustion devices remain of relatively limited success, despite significant progresses made over the last decade. The extremely high demand of computing time of detailed soot models make them unrealistic for simulation of multidimensional, transient, and turbulent diesel engine combustion. Hence, most of the investigations conducted in real configuration such as multidimensional diesel engines simulation utilize coarse modeling, the advantages of which are an easy implementation and low computational cost. In this study, a phenomenological three-equation soot model was developed for modeling soot formation in diesel engine combustion based on considerations of acceptable computational demand and a qualitative description of the main features of the physics of soot formation. The model was developed based on that of Tesner et al. and was implemented into the commercial STAR-CD™ CFD package. Application of this model was demonstrated in the modeling of soot formation in a single-cylinder research version of Caterpillar 3400 series diesel engine with exhaust gas recirculation (EGR). Numerical results show that the new soot formulation overcomes most of the drawbacks in the existing soot models dedicated to this kind of engineering task and demonstrates a robust and consistent behavior with experimental observation. Compared to the existing soot models for engine combustion modeling, some distinct features of the new soot model include: no soot is formed at low temperature, minimal model parameter adjustment for application to different fuels, and there is no need to prescribe the soot particle size. At the end of expansion, soot is predicted to exist in two separate regions in the cylinder: in the near wall region and in the center part of the cylinder. The existence of soot in the near wall region is a result of reduced soot oxidation rate through heat loss. They are the source of the biggest primary particles released at the end of the combustion process. The center part of the cylinder is populated by smaller soot particles, which are created since the early stages of the combustion process but also subject to intense oxidation. The qualitative effect of EGR is to increase the size of soot particles as well as their number density. This is linked to the lower in-cylinder temperature and a reduced amount of air.

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