Numerical Investigation of Losses in Condensing Low-Pressure Steam Turbine Flows Based on a Second Law Analysis PDF Download
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Author: Marius Grübel
Publisher:
ISBN: 9783844080964
Category : Steam
Languages : en
Pages : 0
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Author: Marius Grübel
Publisher:
ISBN: 9783844080964
Category : Steam
Languages : en
Pages : 0
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Author: Christopher Fuhrer
Publisher:
ISBN: 9783844080995
Category : Steam
Languages : en
Pages : 0
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Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 1066
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Category : Dissertations, Academic
Languages : en
Pages : 832
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Author: Edward Frederic Obert
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author:
Publisher:
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Category : Aeronautics
Languages : en
Pages : 940
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Book Description
Author: Miroslav Šťastný
Publisher: Západočeská univerzita v Plzni
ISBN: 8026105427
Category : Technology & Engineering
Languages : en
Pages : 104
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Book Description
Metoda použitá pro popis kondenzace proudící páry je založena na homogenní (spontánní) kondenzaci páry, hetero-homogenní kondenzaci a rovněž na binární nukleaci vodních kapiček s reprezentativní chemickou nečistotou NaCl, která se v energetické páře nejčastěji vyskytuje. Stručně jsou popsány fyzikální a matematické modely kondenzace. Homogenní, hetero-homogenní a binární nukleační modely jsou potom použity pro výpočty proudění páry s kondenzací v 2D dýzách a 2D rozváděcích mřížích prvního stupně s vlhkostí v nízkotlaké části kondenzační turbíny pro uhelnou elektrárnu a v nízkotlaké části turbíny pro jadernou elektrárnu. Pro výpočty byl vyvinut program COCHEM Flow. Uvedeny jsou výsledky výpočtů a jejich rozbor. Popisuje se rovněž experimentální výzkum dvoufázového proudění vlhkého vzduchu s kondenzací v rozváděcí turbínové mříži. Pozornost je také věnována účinku chemických nečistot páry na turbínové lopatky v oblasti kondenzace páry v nízkotlaké části kondenzační turbíny.
Author: Mahdad Talebpour
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Secondary flows of second type (also known as turbulent secondary flows) are one of the mostimportant mechanisms responsible for sediment transport processes in fluvial streams. A newtwo-equation Reynolds-Averaged Navier-Stokes (RANS) based model is investigated in depth inthis work, for modelling secondary flows of second type.This thesis incorporates a new komega model with nonlinear fourth-order closure terms for modellingReynolds stresses. The model has komega formulation which enables the model to solve for flowequations near the walls without the need for utilizing wall functions. Moreover, komega models arecapable of applying roughness on boundaries by imposing rough boundary turbulent attributesthrough omega functions. The model was tested in two main categories on five case-studies to observeits ability in simulating turbulent secondary flow in various configurations. The tests carried outcase scenarios identical to experimental case studies. First, the model was used in simulatingturbulent secondary current in a simple case study conducted inside a rectangular duct with smoothboundaries. The model performed well in this part, when simulated data such as secondary velocityprofiles, shear stresses, and secondary current vectors being compared with experimental data.In the second test, the model was investigated in case scenarios to explore the models capacityfor carrying out simulation of turbulent secondary currents over rough boundaries. While in case studies with uniform rough boundaries the model functioned well (velocity profiles, and shearstress distribution, being compared to experimental data), in cases with non-uniform roughnessdistribution the model needed noticeable tweaking, tuning, and calibration for roughness modelling.However, for validation purposes, the model with calibrated function parameter were tested againstother non-uniform distribution case scenarios, in which their results showed excellent agreementwith experimental data. The numerical simulations were able to produce secondary velocity profilesvery close to experimental studies which are difficult to capture. The proposed roughness heightvalues in roughness modelling function for secondary flows over beds, with nonuniformly distributedroughness, are critically discussed and assessed.During the tuning of the model, it was detected that the original approach for computing wall shearstresses, using law of the wall, provided dissimilar results compared to results which calculatedshear stresses directly from velocity gradients at the wall. This disagreement was investigated indepth, and it was concluded that the calculation of wall shear stress, using law of the wall, was notaccurate. Finally, providing accurate result along with computational efficiency (due to RANS-basedformulation), and applicability to rough case scenarios, this model is advantageous in investigationof turbulent secondary current.
Author:
Publisher:
ISBN:
Category : Electronic journals
Languages : en
Pages : 584
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Book Description
Monthly. Papers presented at recent meeting held all over the world by scientific, technical, engineering and medical groups. Sources are meeting programs and abstract publications, as well as questionnaires. Arranged under 17 subject sections, 7 of direct interest to the life scientist. Full programs of meetings listed under sections. Entry gives citation number, paper title, name, mailing address, and any ordering number assigned. Quarterly and annual indexes to subjects, authors, and programs (not available in monthly issues).
Author: Ronald DiPippo
Publisher: Elsevier
ISBN: 0080554768
Category : Technology & Engineering
Languages : en
Pages : 518
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Book Description
Ron DiPippo, Professor Emeritus at the University of Massachusetts Dartmouth, is a world-regarded geothermal expert. This single resource covers all aspects of the utilization of geothermal energy for power generation from fundamental scientific and engineering principles. The thermodynamic basis for the design of geothermal power plants is at the heart of the book and readers are clearly guided on the process of designing and analysing the key types of geothermal energy conversion systems. Its practical emphasis is enhanced by the use of case studies from real plants that increase the reader's understanding of geothermal energy conversion and provide a unique compilation of hard-to-obtain data and experience. An important new chapter covers Environmental Impact and Abatement Technologies, including gaseous and solid emissions; water, noise and thermal pollutions; land usage; disturbance of natural hydrothermal manifestations, habitats and vegetation; minimisation of CO2 emissions and environmental impact assessment.The book is illustrated with over 240 photographs and drawings. Nine chapters include practice problems, with solutions, which enable the book to be used as a course text. Also includes a definitive worldwide compilation of every geothermal power plant that has operated, unit by unit, plus a concise primer on the applicable thermodynamics.* Engineering principles are at the heart of the book, with complete coverage of the thermodynamic basis for the design of geothermal power systems* Practical applications are backed up by an extensive selection of case studies that show how geothermal energy conversion systems have been designed, applied and exploited in practice* World renowned geothermal expert DiPippo has including a new chapter on Environmental Impact and Abatement Technology in this new edition
