Development of a Numerical Procedure for Integrated Multidisciplinary Thermal-Fluid-Structural Analysis of an Aeroengine Turbine

The aim of the work is to define a methodology and to develop specific tools that allow engineers to investigate and fully characterize the thermal performance of an aero-engine turbine module. The thermal behaviours of a complex system are the result of strong interactions between the fluid-dynamics aspects, the heat balance within each component and the geometric variations mainly due to the thermal and mechanical loads. All these phenomena are strictly connected and cannot be studied separately without introducing approximations and /or errors in the final results. For long time the industrial approach in turbine design has been based on separate analyses of the phenomena with manual iterations between them to allowed acceptable solutions to be reached. The new requirements in reducing the product time-to-market together with the need of higher accuracy in the design, have driven the development of new approaches based on the multi-disciplinary analysis integration. This paper will summarise the AVIO approach to the turbine design procedure upgrade, mainly focused on the thermal analysis and clearances control. A detail of the methodology used will be presented together with a description of the tools developed. A comparison between numerical predictions and experimental data (full engine test) will be reported.

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200kv superconducting cryo electron microscope

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100127645 ◽

1987 ◽

Vol 45 ◽

pp. 642-643

Author(s):

M. Iwatsuki ◽

Y. Kokubo ◽

Y. Harada ◽

J. Lehman

Keyword(s):

Electron Microscope ◽

Structure Analysis ◽

Organic Materials ◽

Strong Interactions ◽

Specimen Preparation ◽

Great Effort ◽

Electron Microscopic ◽

Crystal Fields ◽

Special Skill ◽

Long Time

In recent years, the electron microscope has been significantly improved in resolution and we can obtain routinely atomic-level high resolution images without any special skill. With this improvement, the structure analysis of organic materials has become one of the interesting targets in the biological and polymer crystal fields.Up to now, X-ray structure analysis has been mainly used for such materials. With this method, however, great effort and a long time are required for specimen preparation because of the need for larger crystals. This method can analyze average crystal structure but is insufficient for interpreting it on the atomic or molecular level. The electron microscopic method for organic materials has not only the advantage of specimen preparation but also the capability of providing various information from extremely small specimen regions, using strong interactions between electrons and the substance. On the other hand, however, this strong interaction has a big disadvantage in high radiation damage.

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Analysis of electro- and thermophysical processes occurring during electrocontact baking of flour products.

Khleboproducty ◽

10.32462/0235-2508-2020-29-11-50-55 ◽

2020 ◽

Vol 29 (11) ◽

pp. 50-55

Author(s):

V.I. Maklyukov ◽

◽

E.O. Gerasimova ◽

N. V. Labutina ◽

E.N. Rogozkin ◽

...

Keyword(s):

Electrical Conductivity ◽

Theoretical Calculation ◽

Heat Balance ◽

Electric Contact ◽

Wheat Dough ◽

Baking Process ◽

Free Moisture ◽

Contact Heating ◽

The Heat Balance

The article considers the results of research conducted during electric contact heating of rye-wheat dough pieces. It is established that the electrical conductivity of the crumb dough does not depend on the total humidity of the material, but mainly on the amount of free moisture. Using the current and temperature graphs, you can imagine how free moisture changes during the baking process and the influence of the thermophysical and colloidal process on the change in the value of free moisture. Experimentally determined the amount of heat that is spent on baking 1 kg of bread. The accuracy of the theoretical calculation of this parameter in the heat balance of the baking chamber is confirmed.

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Refined thermal calculation of the locomotive heat engine collector

10.36652/0042-4633-2020-9-56-58 ◽

2020 ◽

pp. 56-58

Author(s):

P.V. Gubarev ◽

D.V. Glazunov ◽

V.G. Ruban ◽

A.S. Shapshal

Keyword(s):

Experimental Data ◽

Electric Motor ◽

Heat Balance ◽

Thermal Imaging ◽

Heat Engine ◽

Thermal Calculation ◽

Calculation Results ◽

Cooling Air ◽

The Heat Balance ◽

Traction Electric Motor

The thermal calculation of the locomotive traction engine collector is proposed. The equations of the heat balance of its elements are obtained taking into account the cooling air. The calculation results and experimental data of thermal imaging control are presented. Keywords: traction electric motor, collector, thermal calculation, thermal imaging control. [email protected]

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Research on On-Line Anti-Icing Technology for Carenary along Electrified Railway

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.676.321 ◽

2013 ◽

Vol 676 ◽

pp. 321-324

Author(s):

Lei Guo ◽

Qun Zhan Li

Keyword(s):

Simulation Model ◽

Heat Balance ◽

Normal Operation ◽

Balance Equations ◽

Model Based ◽

Static Var Generator ◽

On Line ◽

Electrified Railway ◽

The Heat Balance

Accidents of icing on catenary have great impacts on normal operation of trains. An on-line anti-icing technology used static var generator (SVG) for catenary was proposed, which can prevent icing formation without interrupting trains normal operation. The heat balance equations for catenary were solved, whose results were compared with data provided by TB/T 3111 and testing show the equation was correct. The simulation model based on Matlab was bulit , whose results and analysis show the correctness of the method.

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Optimal design of 6-DOF eclipse mechanism based on task-oriented workspace

Robotica ◽

10.1017/s0263574711000774 ◽

2011 ◽

Vol 30 (7) ◽

pp. 1041-1048 ◽

Cited By ~ 5

Author(s):

Donghun Lee ◽

Jongwon Kim ◽

TaeWon Seo

Keyword(s):

Optimal Design ◽

Unit Length ◽

Numerical Procedure ◽

Design Procedure ◽

Mass Reduction ◽

Objective Functions ◽

Design Efficiency ◽

Task Oriented ◽

Structural Mass ◽

Optimal Set

SUMMARYWe present a new numerical optimal design for a redundant parallel manipulator, the eclipse, which has a geometrically symmetric workspace shape. We simultaneously consider the structural mass and design efficiency as objective functions to maximize the mass reduction and minimize the loss of design efficiency. The task-oriented workspace (TOW) and its partial workspace (PW) are considered in efficiently obtaining an optimal design by excluding useless orientations of the end-effector and by including just one cross-sectional area of the TOW. The proposed numerical procedure is composed of coarse and fine search steps. In the coarse search step, we find the feasible parameter regions (FPR) in which the set of parameters only satisfy the marginal constraints. In the fine search step, we consider the multiobjective function in the FPR to find the optimal set of parameters. In this step, fine search will be kept until it reaches the optimal set of parameters that minimize the proposed objective functions by continuously updating the PW in every iteration. By applying the proposed approach to an eclipse-rapid prototyping machine, the structural mass of the machine can be reduced by 8.79% while the design efficiency is increased by 6.2%. This can be physically interpreted as a mass reduction of 49 kg (the initial structural mass was 554.7 kg) and a loss of 496 mm3/mm in the workspace volume per unit length. The proposed optimal design procedure could be applied to other serial or parallel mechanism platforms that have geometrically symmetric workspace shapes.

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Multi-Objective Optimization of a Microturbine Compact Recuperator

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.2836479 ◽

2008 ◽

Vol 130 (3) ◽

Cited By ~ 9

Author(s):

Diego Micheli ◽

Valentino Pediroda ◽

Stefano Pieri

Keyword(s):

Heat Transfer ◽

Three Dimensional ◽

Numerical Procedure ◽

Design Procedure ◽

Domain Size ◽

Multidisciplinary Optimization ◽

Computational Domain ◽

Surface Geometry ◽

Multi Objective ◽

Flux Boundary Conditions

An automatic approach for the multi-objective shape optimization of microgas turbine heat exchangers is presented. According to the concept of multidisciplinary optimization, the methodology integrates a CAD parametric model of the heat transfer surfaces, a three-dimensional meshing tool, and a CFD solver, all managed by a design optimization platform. The repetitive pattern of the surface geometry has been exploited to reduce the computational domain size, and the constant flux boundary conditions have been imposed to better suit the real operative conditions. A new approach that couples cold and warm fluids in a periodic unitary cell is introduced. The effectiveness of the numerical procedure was verified comparing the numerical results with available literature data. The optimization objectives are maximizing the heat transfer rate and minimizing both friction factor and heat transfer surface. The paper presents the results of the optimization of a 50kWMGT recuperator. The design procedure can be effectively extended and applied to any industrial heat exchanger application.

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Investigations of the heat balance in the area of ablation on the Greenland Ice Cap

Archiv für Meteorologie Geophysik und Bioklimatologie Serie B ◽

10.1007/bf02243196 ◽

1960 ◽

Vol 10 (3) ◽

pp. 279-288 ◽

Cited By ~ 3

Author(s):

W. Ambach

Keyword(s):

Heat Balance ◽

Ice Cap ◽

The Heat Balance

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Thermodynamic Evaluation of Gas Turbine Cogeneration Cycles: Part II—Complex Cycle Analysis

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.3240011 ◽

1987 ◽

Vol 109 (1) ◽

pp. 8-15 ◽

Cited By ~ 9

Author(s):

I. G. Rice

Keyword(s):

Gas Turbine ◽

Heat Balance ◽

Steam Injection ◽

Balance Method ◽

Visual Perspective ◽

Thermodynamic Evaluation ◽

The Future ◽

Steam Cooling ◽

The Heat Balance ◽

Regenerative Cycle

Complex open gas turbine cycles are analyzed by applying the heat balance method presented in Part I of this paper. Reheating, intercooling, regeneration, steam injection, and steam cooling are evaluated graphically to give a visual perspective of what takes place in terms of the overall heat balance when such complexities are introduced to the cycle. An example of a viable, new, intercooled regenerative cycle is given. A second example of a prototype reheat gas turbine is also included. The overall approach using the heat balance method can be applied to various cogeneration configurations when considering the more complex cycles of the future.

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