IEC 62097-ed.2.0

Annotation of standard text IEC 62097-ed.2.0 :

IEC 62097:2019 establishes the prototype hydraulic machine efficiency from model test results, with consideration of scale effect including the effect of surface roughness. This document is intended to be used for the assessment of the results of contractual model tests of hydraulic machines. This second edition cancels and replaces the first edition published in 2009. This edition constitutes an editorial and technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) In introduction, clarifications have been brought such as addition of a sentence which declares the precedence of IEC 62097 over IEC 60193 if any mismatch is found between them b) In Clauses 3 and 4, corrections of the typographical errors c) In Clause 3: changes to be in accordance with presentation of the terms and structure of IEC 60193 (except for the water temperature) d) In Clause 4: – Deletion of the clause providing the direct step-up procedures for a whole turbine – Introduction of a global view by using turbine A and turbine B instead of model turbine, reference model turbine and prototype turbine – Move of section dealing with “surface roughness of model and prototype” in a new Clause 5 e) In Clause 5: – Introduction of additional chapters to answer comments raised at the CDV stage and to clarify the subject of surface roughness of model and prototype – Introduction of new tables for minimum recommended prototype roughness for new radial or diagonal machines and for new axial turbines – Addition of the explanation about roughness measurement of heavily rusted surface f) In Clause 7 (former Clause 6): – Introduction of a new subclause for clarifications about the assumed maximum hydraulic efficiency, hhAmax – Deletion of the requirement of mutual agreement for the application of the step-up formula for very high efficiency machines exceeding hhAmax – Clarifications of the equations from 22 to 33 by doubling the equations for suiting the “two step method g) In Clauses 6 and 7, correction of typographical errors h) In Clause 8 (former Clause 7), introduction of new figures for clarifying the “2 step” method and the alternative method i) In Annex A, modification of the flux diagram to be in compliance with IEC 60193 j) In Annex B: – Correction of the equation to obtain ?ECO – Deletion of the clause which describes the direct step-up procedures for radial flow machines k) In Annex C, deletion of the clause which describes the direct step-up procedures for axial flow machines l) In Annex D: – notes become main text – change of variable names in Subclause D.1 for clarifications m) Addition of Annex E, about comparison of IEC standards dealing with models: 60193 and 62097 n) In Annex F, clarifications of equations by adding more subscripts o) The Excel sheets attached to the standard are revised as itemized below – Deletion of the routine regarding the direct step-up procedures for a whole turbine – Deletion of the notice which requires mutual agreement when the step-up is applied to high efficiency machines exceeding hhAmax – Addition of the routine to process the normalization of test data obtained at optimum test conditions p) Simplification of structure, calculation of optimum and individual point, step up calculation with hhAmax Keywords: Hydraulic Machines, Radial And Axial Performance Transposition. IEC 62097:2019 sapplique a la verification du rendement et des performances de machines hydrauliques prototypes a partir des resultats dessais sur modele reduit en tenant compte des effets dechelle y compris de leffet de rugosite de surface. Le present document est prevue pour etre employee lors de levaluation des resultats des essais contractuels sur modele reduit de machines hydrauliques. Cette deuxieme edition annule et remplace la premiere edition parue en 2009. Cette edition constitue une revision editoriale et technique. Cette edition inclut les modifications techniques majeures suivantes par rapport a ledition precedente: a) En introduction, des clarifications ont ete apportees comme lajout dune phrase qui declare la primaute de la CEI 62097 sur la CEI 60193 en cas de discordance entre les 2 normes a) Aux Articles 3 et 4, les corrections des erreurs typographiques b) A lArticle 3 : des modifications rendant conformes la presentation des termes et la structure de ce document avec la CEI 60193 (a lexception de la temperature de leau) c) A lArticle 4 : – La suppression de l’article decrivant la procedure de transposition directe pour la machine hydraulique complete – L’introduction dune vision globale en utilisant la notion de turbine A et de turbine B au lieu de turbine modele, de turbine modele de reference et de turbine prototype – Deplacement de la section traitant de "rugosite de surface du modele et du prototype" dans un nouvel Article 5 d) A lArticle 5 : – L’introduction de chapitres supplementaires pour repondre aux commentaires souleves au stade du CDV et pour clarifier le sujet de la rugosite de surface du modele et du prototype – L’introduction de nouveaux tableaux pour la rugosite minimale recommandee du prototype pour les nouvelles machines radiales ou diagonales et pour les nouvelles turbines axiales – L’ajout d’une explication sur la mesure de la rugosite des surfaces fortement rouillees e) A lArticle 7 (anciennement Article 6) : – L’introduction dun nouveau paragraphe pour clarification a propos du rendement hydraulique maximal suppose, hhAmax – La suppression de l’agrement mutuel pour l’application de la formule de transposition pour les machines dont le rendement tres eleve excede hhAmax – Des clarifications des equations 22 a 33 en doublant les equations pour correspondre a la "methode en deux etapes" f) Aux Articles 6 et 7, les corrections des erreurs typographiques g) A lArticle 8 (anciennement Article 7), l’introduction de nouveaux indices pour clarifier la methode "en deux etapes" et la methode alternative h)