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<p>The paper presents a review of existing renewable water lifting devices from low-head streams and identifies a niche for hydraulic turbine-pumps for the stream/drive discharge criterion of 40-120 l/s and input head between 2 and 5 m. The work focuses on a Kaplan turbine-driven submersible pump in a horizontal encapsulated configuration to be installed on riverbeds. A site in Central East India is chosen for demonstration of the system whose farmers who are unable to practice irrigation in non-monsoon months. A methodology of design and its validation at the laboratory scale and field enables operational diagnoses and replication in new projects. The laboratory results at 3.25 m turbine head and pump head of 21 meters demonstrated an overall turbine-pump efficiency of 48%, while in field condition the maximum head achieved was only 2.69 m with overall efficiency of 40%. A unique scaling of design is discussed for flows as low as 60 l/s which was previously considered impossible for turbine design. The paper also recommends special emphasis on draft tube research due to higher head losses along with turbine shape optimization for low head hydropower pumping.</p>

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Design of turbine pumps as a niche water lifting device for input supply criterion of 40-120 l/s, 2-5 m, with case study of an implemented project

  • 期刊论文

  • 发表日期：

    2025年3月19日

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  • Rohan P Unni,
  • Siddhi Kesharwani,
  • Shubham Chaudhary,
  • Punit Singh

摘要

The paper presents a review of existing renewable water lifting devices from low-head streams and identifies a niche for hydraulic turbine-pumps for the stream/drive discharge criterion of 40-120 l/s and input head between 2 and 5 m. The work focuses on a Kaplan turbine-driven submersible pump in a horizontal encapsulated configuration to be installed on riverbeds. A site in Central East India is chosen for demonstration of the system whose farmers who are unable to practice irrigation in non-monsoon months. A methodology of design and its validation at the laboratory scale and field enables operational diagnoses and replication in new projects. The laboratory results at 3.25 m turbine head and pump head of 21 meters demonstrated an overall turbine-pump efficiency of 48%, while in field condition the maximum head achieved was only 2.69 m with overall efficiency of 40%. A unique scaling of design is discussed for flows as low as 60 l/s which was previously considered impossible for turbine design. The paper also recommends special emphasis on draft tube research due to higher head losses along with turbine shape optimization for low head hydropower pumping.