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4 Papers

Mixing and Combustion of Turbulent Coaxial Jets - An Application of Computational Fluid Dynamics to Swirling Flows

Topics: Energy and Power Systems; Fluid Dynamics

Authors: Teresa Parra 1 , Ruben Perez 1 , Miguel Angel Rodriguez 1 , Artur Gutkowski 2 , Robert Szasz 3 and Francisco Castro 1

Affiliations: 1 University of Valladolid, Spain , 2 Technical University of Lodz, Poland , 3 Lund University, Sweden

Digital Object Identifier: 10.5220/0005009005450550

Proceedings of SIMULTECH 2014, ISBN: 978-989-758-038-3

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The aim of this research is gaining an insight into flow patterns in swirling burners. These are suitable for lean mixtures, because of procuring the fix position of the flame. The interaction of the two reactive confined swirling jets leads to the formation of complex patterns which are not well understood. In the present study, these flow patterns are numerically investigated using Reynolds Averaging Navier-Stokes (RANS) equations for the flow and a Probability Density Function is used for modelling the combustion. Two swirl numbers were characterised: 0.14 and 0.74. Strong swirling annular jets are responsible of an inner recirculation zone. Low swirling flows produce poorer mixture and wide flame fronts whereas strong swirling flows are precursors of mixing enhancement and thing flame fronts.
Collapse Button Related Ontology Subjects/Areas/Topics (5)
Application Domains

Energy and Power Systems

Simulation and Modeling
Complex Systems Modeling and Simulation

Fluid Dynamics

Generalized Independent Subqueries Method

Topics: Object-Oriented Database Systems; Non-Relational Databases; Query Languages and Query Processing

Authors: Tomasz Marek Kowalski 1 , Radosław Adamus 1 , Jacek Wiślicki 1 and Michał Bleja 2

Affiliations: 1 Technical University of Lodz, Poland , 2 University of Lodz, Poland

Digital Object Identifier: 10.5220/0003994802000204

Proceedings of ICEIS 2012, ISBN: 978-989-8565-10-5

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The following paper presents generalisation of the independent subquery method for object-oriented query languages. A subquery is considered independent if none of involved names is bound in a stack section opened by a currently evaluated non-algebraic operator. Optimisation of such a subquery is accomplished by factoring it out from a loop implied by its query operator. We generalise the method to factor out also subqueries that are evaluated only in a context of independent subqueries of a given query. The query is rewritten to an equivalent form ensuring much better performance. Our research bases on the Stack-Based Architecture of query languages having roots in semantics of programming languages. The paper illustrates the method on an comprehensive example and finally presents the general rewriting rule.
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Databases and Information Systems Integration

Non-Relational Databases

Query Languages and Query Processing
Enterprise Information Systems

Object-Oriented Database Systems

GENERIC APPROACH TO AUTOMATIC INDEX UPDATING IN OODBMS

Topic: Object-Oriented Database Systems

Authors: Tomasz M. Kowalski , Kamil Kuliberda , Jacek Wiślicki and Radosław Adamus

Affiliation: Technical University of Lodz, Poland

Digital Object Identifier: 10.5220/0001834702550260

Proceedings of ICEIS 2009, ISBN: 978-989-8111-84-5

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In this paper, we describe a robust approach to the problem of the automatic index updating, i.e. maintaining cohesion between data and indices. Introducing object-oriented notions (classes, inheritance, polymorphism, class methods, etc.) in databases allows defining more complex selection predicates; nevertheless, in order to facilitate selection process through indices, index updating requires substantial revising. Inadequate index maintenance can lead to serious errors in query processing what has been shown on the example of Oracle 11g ORDBMS. The authors work is based on the Stack-Based Architecture (SBA) and has been implemented and tested in the ODRA (Object Database for Rapid Applications development) OODBMS prototype.
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Databases and Information Systems Integration

Enterprise Information Systems

Object-Oriented Database Systems

MICROSILICON LUMINOUS FLUX SWITCH CONTROLLED BY MEANS OF MAGNETIC FIELD

Topic: Mechatronic Systems

Authors: J. Golebiowski and T. Prohun

Affiliation: Technical University of Lódz, Poland

Digital Object Identifier: 10.5220/0001168403010306

Proceedings of ICINCO 2005, ISBN: 972-8865-29-5

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The construction of a silicon beam which is used as a optical switch was presented. The investigated beam consists of three layers: on the silicon base the iron layer is put and it is followed by the aluminium layer. The change of the external magnetic field intensity causes the beam end displacement as well as the change of the luminous flux reflection angle. The influence of the magnetic transducer parameters as well as the field intensity on the luminous flux reflection angle are analysed. The optical system which is steered by the magnetic field was described.
Collapse Button Related Ontology Subjects/Areas/Topics (3)
Informatics in Control, Automation and Robotics

Intelligent Control Systems and Optimization

Mechatronic Systems

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