{"id":11521,"date":"2023-11-27T10:52:14","date_gmt":"2023-11-27T10:52:14","guid":{"rendered":"https:\/\/flovel.net\/dhakrani-rmu-project-model-test\/"},"modified":"2023-11-28T09:31:42","modified_gmt":"2023-11-28T09:31:42","slug":"dhakrani-rmu-project-model-test","status":"publish","type":"post","link":"https:\/\/flovel.net\/de\/dhakrani-rmu-project-model-test\/","title":{"rendered":"Dhakrani RMU Project \u2013 Model Test"},"content":{"rendered":"
[vc_row el_class=”main-container-with-sidebar”][vc_column width=”3\/4″][vc_row_inner][vc_column_inner][vc_custom_heading text=”Dhakrani RMU Project \u2013 Model Test” use_theme_fonts=”yes”][vc_single_image image=”11578″ img_size=”large”][vc_column_text]Introduction\r\n<\/strong>This article aims to describe the model testing carried out by Jaberg and Partner GmbH<\/strong> at Institute of Hydraulic Fluid Machinery (HFM)<\/strong> laboratory, Graz University of Technology, Austria, for the Dhakrani HEP RMU<\/strong> Project in India. Jaberg and Partner are leading experts for fluid technology in application oriented for turbines and was commissioned by FLOVEL to develop a new Kaplan turbine to suit the RMU requirements.\r\n\r\nAbout the project\r\n<\/b>The Dharkrani HEP<\/strong> was originally commissioned in 1965\/1966\/1970 with Litostroj Power make Turbines (Yugoslavia). The project is owned and operated by Uttarakhand Jal Vidyut Nigam Limited (UJVN Ltd.), Uttarakhand, India. The supply is equipped with replacement of three units of Kaplan machines, running at synchronous speed of 187.50 rpm, operating under rated net head of 19.6 m. After renovation the Dhakrani HEP<\/strong> will generate an output of 3 x 11,250 kW with 10% upgradation.\r\n<\/b>\r\n\r\nReverse Engineering\r\n<\/strong>Reverse Engineering of the existing water passages was carried out using scanning technology of surfaces at site and original Litostroj drawings as\u00a0reference only.\r\n

A 3D drawing of water passages for CFD simulation purpose was prepared and\u00a0checked to ensure the reproduction of existing passages within the hydraulic\u00a0tolerances defined in IEC 60193.<\/p>\r\n[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner][vc_column_inner width=”1\/2″][vc_single_image image=”11581″ img_size=”large”][\/vc_column_inner][vc_column_inner width=”1\/2″][vc_single_image image=”11654″ img_size=”large”][\/vc_column_inner][\/vc_row_inner][vc_column_text]CFD Studies and Hydraulic Design<\/strong>\r\nThe application of a new runner and distributor in the existing water passage was extensively studied and verified through CFD analysis. The new runner was based on state-of-the-art technology.[\/vc_column_text][vc_row_inner][vc_column_inner][vc_single_image image=”11587″ img_size=”large”][\/vc_column_inner][\/vc_row_inner][vc_column_text]Model Design and Manufacturing<\/strong>\r\nThe model was designed and manufactured in Europe by Jaberg and Partner. The spiral casing and draft tube elbow were manufactured out of Aluminium blocks with high precision CNC milling. All components were finally inspected using modern CMM technology.[\/vc_column_text][vc_row_inner][vc_column_inner width=”1\/2″][vc_single_image image=”11658″ img_size=”large”][\/vc_column_inner][vc_column_inner width=”1\/2″][vc_single_image image=”11593″ img_size=”large”][\/vc_column_inner][\/vc_row_inner][vc_row_inner][vc_column_inner width=”1\/2″][vc_single_image image=”11661″ img_size=”large”][\/vc_column_inner][vc_column_inner width=”1\/2″][vc_single_image image=”11673″ img_size=”large”][\/vc_column_inner][\/vc_row_inner][vc_column_text]Model Test<\/strong>\r\nIn accordance with the contract, a homologous model acceptance test as per IEC 60193 was conducted to verify the hydraulic performance guarantees that are crucial for the long-term operation of the units.\r\n\r\nThe main hydraulic performance characteristics in regards of efficiency, power, cavitation, runaway, and axial thrust have been preliminarily tested. Complementary tests were made for wicket gate and runner blade torque.[\/vc_column_text][vc_row_inner][vc_column_inner width=”1\/2″][vc_single_image image=”11679″ img_size=”large” alignment=”center”][\/vc_column_inner][vc_column_inner width=”1\/2″][vc_single_image image=”11688″ img_size=”large” alignment=”center”][\/vc_column_inner][\/vc_row_inner][vc_single_image image=”11608″ img_size=”large”][vc_column_text]UJVN Ltd.<\/strong> attended the witnessed part of the model test performed in Graz, Austria. During that time the test was also witnessed online from FLOVEL<\/strong> and UJVN Ltd<\/strong>. Head Offices located in Faridabad and Dehradun respectively, both locations in India. The tests were concluded in April 2023.[\/vc_column_text][vc_row_inner][vc_column_inner width=”1\/2″][vc_single_image image=”11611″ img_size=”large”][\/vc_column_inner][vc_column_inner width=”1\/2″][vc_single_image image=”11670″ img_size=”large”][\/vc_column_inner][\/vc_row_inner][vc_column_text]All test results from the preliminary and witnessed tests were compiled in a final report.\r\n\r\nObservations and Conclusions<\/strong>\r\nAfter the completion of model test for Dhakrani HEP, the hydraulic design validation was done based on the observation that:\r\n