دانلود رایگان مقاله انگلیسی شبیه سازی و بررسی مدل های شبیه سازی شده توربین هیدرولیکی فرانسیس - الزویر 2018

Abstract

The paper presents simulations using three different models for a hydraulic turbine. The models are too simple and unrealistic to be used for actual simulations, but the intention is to discuss behaviour intrinsic to the models that provide insight into the physics involved. The presented results point out several behaviours that are contradictory to actual turbine behaviour, and suggest what can be done to avoid this. The models can be used as a basis for later modifications that make the models applicable for simulations, modifications the authors are currently working on.

7. CONCLUSION

Three models are investigated in this paper. None of them can be used as a full model as they are presented in this paper, but investigating them without many different loss models obscuring the results might provide insight into the actual physics involved. The authors conciders the effect due to the mismatch beween geometry and flow at runner inlet, often called incipient losses, to be the significant inlet effect, shown to significantly move the efficiency from 1 for all rotational speeds and opening degrees, to something that looks like an actual efficiency curve. Even if improved compared to the Euler model, the flow/rotational speed characteristics of the new model indicates that the new model is unable to fully capture the significant physics involved.

More work is needed to include other sources of loss in the energy transformation process occuring inside a hydraulic turbine, as well as including terms that is present at transient conditions. The authors are currently working on this.