To supply continuous and reliable power to the water monitoring systems and motorized control valves in urban water supply networks, the inline cross-flow turbine has been developed. This study aims to investigate the effects of different runner geometries on the performance of inline cross-flow turbines and to determine the optimal runner geometrical parameters. In this paper, a theoretical analysis of the working mechanism of a cross-flow runner is first performed to study the impacts of the runner geometry on turbine performance. Thereafter, several turbine models with different runner geometries are built and simulated to analyse the output power, water head reduction and torque generation at each runner stage. The results indicate that a good match between the flow inlet angle and blade outer angle notably enhances the turbine performance. Based on the results, the recommended optimal blade outer angle in this research is 30°. In addition, the results also show that the runner diameter ratio has a major impact on torque generation at the runner first stage. A lower runner diameter ratio leads to a higher output power, but the water head reduction is also higher. Based on the results, the suggested runner diameter ratio is 0.68. A numerical study on the number of blades indicates that when the number of blades increases from 20 to 24, the turbine output power considerably rises, and the maximum output power reaches 2285 W. However, if the blade number is further increased, the variation in output power is very slight. Thus, the proposed optimal blade number is 24. Based on the research results, the maximum turbine efficiency can reach 50.9% after runner optimization.

为了向城市供水网络中的水监控系统和电动控制阀提供连续而可靠的电力，已经开发了直插式横流式涡轮机。这项研究旨在研究不同转轮几何形状对直插式横流式涡轮机性能的影响，并确定最佳的转轮几何参数。本文首先对横流转轮的工作机理进行了理论分析，以研究转轮几何形状对涡轮性能的影响。此后，建立并模拟了几种具有不同转轮几何形状的涡轮机模型，以分析每个转轮阶段的输出功率，水头降低和扭矩产生。结果表明，流入口角和叶片外角之间的良好匹配显着增强了涡轮机性能。根据结果​​，本研究中推荐的最佳叶片外角为30°。此外，结果还表明，转轮直径比对转轮第一阶段的扭矩产生有重大影响。较低的流道直径比导致较高的输出功率，但水头降低量也较高。根据结果​​，建议的流道直径比为0.68。叶片数量的数值研究表明，当叶片数量从20增加到24时，涡轮机输出功率显着提高，最大输出功率达到2285W。但是，如果叶片数量进一步增加，则叶片的变化输出功率很小。因此，建议的最佳叶片数为24。根据研究结果，经过转轮优化后，最大涡轮效率可达到50.9％。