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Abstract：
The performance of a Pelton wheel is influenced by the jet created by the nozzle. Therefore, a Computational Fluid Dynamics (CFD) simulation was proposed. In this study, the significant output parameters (outlet velocity, outlet pressure, and tangential force component) and input parameters (different pressure and spear locations) were examined. In addition, the influencing parameters and their contributing percentages to the performance of the Pelton wheel were calculated using different optimisation techniques such as Taguchi Design of Experiments (DoE), Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS), Grey Relational Analysis (GRA) and Criteria Importance Through Intercriteria Correlation (CRITIC). The effect of input factors on the output response was examined with DoE, and the results show that the inlet pressure had the most significant impact (97.38%, 99.18%, and 97.38%, respectively, for all different spear sites with a 99% confidence level). In terms of preference values, the TOPSIS and GRA results are comparable (best ranks for simulation runs #24 and #25 and least ranks for simulations #2 and #3, respectively). The CRITIC results for the pressure parameter are in good agreement with the Taguchi ANOVA analysis. The last spear location (5 mm after the nozzle outlet), with an inlet pressure of 413685 Pa generated the best result when employing the TOPSIS and GRA techniques. The outlet pressure of the nozzle was found to have a significant impact on the flow pattern of the Pelton Wheel based on the analysis of the CRITIC, Taguchi, and CFD results.
摘要：
Pelton轮的性能受到喷嘴产生的射流的影响。因此,提出了一种计算流体动力学(CFD)仿真方法。在这项研究中,重要的输出参数(出口速度，出口压力,和切向力分量)和输入参数(不同的压力和矛位置)进行了检查。此外,使用不同的优化技术，例如Taguchi实验设计（DoE），计算了影响参数及其对Pelton轮性能的贡献百分比，与理想解相似的偏好顺序技术(TOPSIS)，灰色关联分析(GRA)和标准间相关性(CRITIC)的标准重要性。使用DoE检查了输入因素对输出响应的影响，结果表明，进口压力影响最显著(97.38%，99.18%,和97.38%，分别,对于所有不同的矛状部位，置信水平为99%)。就偏好值而言，TOPSIS和GRA结果是可比较的(分别为模拟运行#24和#25的最佳等级和模拟#2和#3的最低等级)。压力参数的临界结果与TaguchiANOVA分析非常吻合。最后一个长矛位置（喷嘴出口后5mm），当采用TOPSIS和GRA技术时，入口压力为413685Pa产生最佳结果。根据对CRITIC的分析，发现喷嘴的出口压力对Pelton轮的流型有重大影响，田口,和CFD结果。
