We present a unique comparison of two types of renewable hydro pumping devices, namely the ram and turbine pump having different working principles. This comparison is based on experiments with these pumping devices at a field station in a village in central-east India. Our work identifies the major gaps in the study of large ram pumps, covering the hydraulic scaling conformance to creation of a unified platform for the investigation of such pumping devices with respect to operating parameters like head, flow, efficiency and, most importantly, size. The field tests of ram revealed that its non-dimensional performance parameters fit perfectly on the theoretical scaling curves. The investigations further showed that while rams had more efficiency (53–62%), they could not handle more than 40–50 l/s of discharge. In comparison, the turbine pumps, tested in laboratory conditions, were more compact for flows beyond 100 l/s, but they settled for overall efficiencies between 49% and 55%. The study recommends a limiting design flow line for rams to be 50 l/s because of the size-factor. It further finds that for absolute flows between 50 and 100 l/s within the low-head range of 3–5 meters, the design of geometrical shapes for turbine pumps could be a challenge for optimized efficiencies. The head-discharge-diameter (H-Q-D) chart developed here is a useful way of interpreting the technology with respect to boundary conditions and it creates a roadmap for future inventions in such renewable hydro-pumping devices. The paper makes a case for axial flow pumps as turbines. It concludes with a call for the propagation of research on such nature-friendly pumping technologies, where most (90–95%) of the water is returned to the stream, paving the way for a new era of sustainability.

我们对两种类型的可再生水力抽水设备，即具有不同工作原理的柱塞泵和涡轮泵进行了独特的比较。该比较是基于在印度中东部一个村庄的现场站对这些抽水设备进行的实验。我们的工作确定了大型柱塞泵研究的主要空白，涵盖了液压比例尺的符合性，即创建一个统一的平台来研究此类抽油机的扬程，流量，效率以及最重要的是尺寸等工作参数。ram的现场测试表明，它的无量纲性能参数完全符合理论比例曲线。调查进一步表明，尽管撞锤的效率更高（53–62％），但它们的卸料速度不能超过40–50 l / s。相比之下，涡轮泵 在实验室条件下进行测试时，流量大于100 l / s时更为紧凑，但总体效率在49％至55％之间。研究建议，由于尺寸因素，撞锤的极限设计流线应为50 l / s。它进一步发现，对于在3米至5米的低扬程范围内的绝对流量在50至100 l / s之间的情况，涡轮泵的几何形状设计可能是优化效率的挑战。此处开发的总排放口直径（HQD）图表是解释有关边界条件的技术的有用方法，它为此类可再生水泵装置的未来发明创造了路线图。本文为轴流泵作为涡轮机提供了理由。最后，呼吁传播这种对自然友好的抽水技术的研究，