Thermodynamic Model of the ASZ-62IR Radial Aircraft Engine

2018 ◽  
Vol 2018 (1) ◽  
pp. 36-48 ◽  
Author(s):  
Paweł Magryta ◽  
Konrad Pietrykowski ◽  
Michał Gęca
Keyword(s):  
Combustion Process ◽  
Calorific Value ◽  
Aircraft Engine ◽  
Stoichiometric Ratio ◽  
One Dimensional ◽  
Engine Model ◽  
Isentropic Flow ◽  
Air Stream ◽  
The One ◽  
Fuel Stream

Abstract The article presents assumptions of the one-dimensional model of the ASz-62IR aircraft engine. This model was developed in the AVL BOOST software. The ASz-62IR is a nine cylinder, aircraft engine in a radial configuration. It is produced by the Polish company WSK “PZL-Kalisz” S. A. The model is used for calculating parameters of the fuel stream and the air stream in intake system of the engine, as well as for the analyses of the combustion process and the exhaust flow to the external environment. The model is based on the equations describing the isentropic flow. The geometry of the channels and all parts of the model has been mapped on the basis of empirical measurements of the engine elements. The model assumes indirect injection where the gasoline was used as a fuel with the calorific value of 43.5 MJ/kg. The model assumes a mixture of a stoichiometric ratio of 14.5. This model is only part of the overall the ASz-62IR engine model. After the simulation tests on the full model the obtained results confirmed the correctness of the model used to create the mixture. It was found that the AVL BOOST software is good for the implementation of this type of work.

scholarly journals Simulation Research of Aircraft Piston Engine Rotax 912

2019 ◽  
Vol 252 ◽  
pp. 05007 ◽  
Author(s):  
Łukasz Grabowski ◽  
Ksenia Siadkowska ◽  
Krzysztof Skiba
Keyword(s):  
Combustion Process ◽  
Engine Performance ◽  
Aircraft Engine ◽  
Basic Unit ◽  
Piston Engine ◽  
Engine Operation ◽  
Simulation Research ◽  
One Dimensional ◽  
Operation Process ◽  
Model Aircraft

This paper reports the results of simulation works of Rotax 912 aircraft piston engine, which is a basic unit in most ultra-light aircrafts. The method for preparing the model aircraft engine operation process was presented. Simulation tests were carried out in the AVL Boost programme. The programme allows a full use of zero-dimensional and one-dimensional modelling. It also allows a comparison of other engine models. The developed model has enabled us to simulate the flow of air through the inlet pipes, carburettors, valves and combustion process. The preparation of the model required us to enter parameters that are not available in the manufacturer's catalogue, therefore, necessary measurements and analysis of the engine parts were carried out on a laboratory bench. The calculations in the AVL Boost programme were carried out in the conditions determined for the selected BMEP values with the objective of characterising the engine performance by determining its power, torque and fuel consumption.

One-Dimensional Simulation of the Combustion Process in an Engine Cylinder with Ethanol

2014 ◽  
Vol 660 ◽  
pp. 447-451
Author(s):  
Akasyah M. Kathri ◽  
Rizalman Mamat ◽  
Amir Aziz ◽  
Azri Alias ◽  
Nik Rosli Abdullah
Keyword(s):  
Diesel Engine ◽  
Alternative Fuels ◽  
Engine Speed ◽  
Combustion Process ◽  
Cylinder Pressure ◽  
Ethanol Fuel ◽  
One Dimensional ◽  
Engine Cylinder ◽  
Dimensional Simulation ◽  
The One

The diesel engine is one of the most important engines for road vehicles. The engine nowadays operates with different kinds of alternative fuels, such as natural gas and biofuel. The aim of this article is to study the combustion process that occurs in an engine cylinder of a diesel engine when using biofuel. The one-dimensional numerical analysis using GT-Power software is used to simulate the commercial four-cylinder diesel engine. The engine operated at high engine load and speed. The ethanol fuel used in the simulation is derived from the conventional ethanol fuel properties. The analysis of simulations includes the cylinder pressure, combustion temperature and rate of heat release. The simulation results show that in-cylinder pressure and temperature for ethanol is higher than for diesel at any engine speed. However, the mass fraction of ethanol burned is similar to that of diesel. MFB only affects the engine speed.

Sensitivity Analysis of an Aircraft Engine Model Under Consideration of Dependent Variables

2021 ◽  
Author(s):  
Julian Salomon ◽  
Jan Göing ◽  
Sebastian Lück ◽  
Matteo Broggi ◽  
Jens Friedrichs ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Engine Performance ◽  
Aircraft Engine ◽  
Interaction Effects ◽  
Performance Model ◽  
Engine Model ◽  
Overall Performance ◽  
Input Variables ◽  
The One ◽  
The Impact

Abstract In this work the impact of combined module variances on the overall performance of a high-bypass aircraft engine is investigated. Therefore, a comprehensive sensitivity analysis on the example of a turbofan engine performance model is provided by means of Kucherenko indices. Direct influences of selected model inputs on key model outputs as well as influences due to interaction effects between these input variables are identified. The selected input variables of the performance model are partly subject to considerable dependencies that are taken into account by the Kucherenko indices. The results confirm known direct influences of deterioration effects on the key performance parameters of the aircraft engine on the one hand, and provide profound insights into complex interaction effects between the components and their impact on the V2500-A1 aircraft engine performance on the other.

Comparison of Micro-Pressure Wave Radiated Out of Tunnel Exit between Slab Track and Ballast Track

2011 ◽  
Vol 90-93 ◽  
pp. 2183-2187 ◽  
Author(s):  
Feng Geng ◽  
Qian Zhang
Keyword(s):  
Pressure Wave ◽  
High Speed ◽  
High Speed Train ◽  
Tunnel Length ◽  
One Dimensional ◽  
Isentropic Flow ◽  
Calculation Process ◽  
Ballast Track ◽  
Reduction Effect ◽  
The One

Based on the one-dimensional unsteady compressible non-isentropic flow theory, micro-pressure wave radiated out of tunnel exit generated by a high-speed train entering a tunnel was investigated. In calculation process, the track roadbed and tunnel length were considered. The results, which were qualitatively and quantitatively analyzed, show that the ballast track has reduction effect of micro-pressure wave in long tunnel.

Streamlined Modeling of Compressible Flows

2006 ◽  
Author(s):  
Richard A. Gaggioli
Keyword(s):  
Compressible Flows ◽  
Governing Equations ◽  
One Dimensional ◽  
Specific Heats ◽  
Property Relations ◽  
Equation Solving ◽  
Isentropic Flow ◽  
Dimensional Modeling ◽  
Ideal Gases ◽  
The One

The development of the compressible flow tables by Shapiro, Hawthorne and Edelman [1-3] was a boon to the one-dimensional modeling of compressible flows - isentropic flow, Fanno flow, Rayleigh flow, normal shock. Nevertheless, the use of the tables is cumbersome. Furthermore, becoming engrossed with the mechanics of applying the tables, students and practitioners often lose sight of the fundamentals that are being applied. The present paper will illustrate the direct application of the basic one-dimensional governing equations to the modeling of compressible flows. In a straightforward fashion mass, momentum, energy and entropy balances, along with transport and property relations, are applied directly (without the use of tables or graphs) to model and to find solutions. Moreover, unlike the tables, the modeling does not need to assume ideal gases, let alone a constant ratio of specific heats. The key to this improved and easy approach, unavailable at the time the tables were developed, is the accessibility of equation solving software that includes property relations for gases and liquids. In particular, in the present work, EES (from fchart software; see fchart.com) was employed.

scholarly journals TWO-DIMENSIONAL FLAME INSTABILITY AND CONTROL OF BURNING IN THE HAlF-OPEN FIRECHAMBER

2016 ◽  
Vol 8 (1) ◽  
Author(s):  
V. E. Volkov
Keyword(s):  
Combustion Process ◽  
Open Channels ◽  
Flame Stability ◽  
Front Wall ◽  
Two Dimensional ◽  
One Dimensional ◽  
Fuel Supply ◽  
Flame Instability ◽  
The One ◽  
And Control

The flame stability with regard to two-dimensional exponential perturbations both for the combustion in the half-open fire-chamber and the flame propagating in half-open channels is investigated. It is proved that only instability ispossible for the combustion process. At the same time the one-dimensional flame instability is guaranteed near the front wall of the fire-chamber where the fuel supply is realized. Possibilities for the control of combustion in the halfopenfire-chamber and diminishing of intensity of pulsations are discussed.

Exploring the Multidimensional Facets of Authoritarianism: Authoritarian Aggression and Social Dominance Orientation

2008 ◽  
Vol 67 (1) ◽  
pp. 51-60 ◽  
Author(s):  
Stefano Passini
Keyword(s):  
Social Dominance ◽  
Factor Model ◽  
Three Dimensional ◽  
Social Dominance Orientation ◽  
Model Fit ◽  
Regression Analyses ◽  
One Dimensional ◽  
Confirmatory Factor ◽  
The One ◽  
Better Than

The relation between authoritarianism and social dominance orientation was analyzed, with authoritarianism measured using a three-dimensional scale. The implicit multidimensional structure (authoritarian submission, conventionalism, authoritarian aggression) of Altemeyer’s (1981, 1988) conceptualization of authoritarianism is inconsistent with its one-dimensional methodological operationalization. The dimensionality of authoritarianism was investigated using confirmatory factor analysis in a sample of 713 university students. As hypothesized, the three-factor model fit the data significantly better than the one-factor model. Regression analyses revealed that only authoritarian aggression was related to social dominance orientation. That is, only intolerance of deviance was related to high social dominance, whereas submissiveness was not.

Adiabatic large polarons in anisotropic molecular crystals

2011 ◽  
Vol 35 (1) ◽  
pp. 15-27
Author(s):  
Zoran Ivić ◽  
Željko Pržulj
Keyword(s):  
Energy Transfer ◽  
Effective Mass ◽  
Molecular Crystals ◽  
Single Chain ◽  
Proper Understanding ◽  
One Dimensional ◽  
Interchain Coupling ◽  
Large Polaron ◽  
The One

Adiabatic large polarons in anisotropic molecular crystals We study the large polaron whose motion is confined to a single chain in a system composed of the collection of parallel molecular chains embedded in threedimensional lattice. It is found that the interchain coupling has a significant impact on the large polaron characteristics. In particular, its radius is quite larger while its effective mass is considerably lighter than that estimated within the one-dimensional models. We believe that our findings should be taken into account for the proper understanding of the possible role of large polarons in the charge and energy transfer in quasi-one-dimensional substances.

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