Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Numerical investigation of the spear valve configuration on the performance of Pelton and Turgo turbine injectors and runners
AU - Benzon, David
AU - Zidonis, Audrius
AU - Panagiotopoulos, Alexandros
AU - Aggidis, George
AU - Anagnostopoulos, Ioannis
AU - Papantonis, Dimitrios
PY - 2015/6/25
Y1 - 2015/6/25
N2 - This paper uses two modern commercial CFD software packages to compare the performance of a standard and improved impulse turbine injector developed in a previous study. The two injector designs are compared by simulating the 2D axis-symmetric cases as well as full 3D cases including the bend in the branch pipe and the guide vanes. The resulting jet profiles generated by these simulations are used to initialise the inlet conditions for a full Pelton and Turgo runner simulation at different operating conditions in order to assess the impact of the injector design on the performance and efficiency of a real impulse turbine.The results showed that the optimised injector design, with steeper nozzle and spear angles, not only attains higher efficiencies in the 2D and 3D injector simulations, but produces a jet which performs better than the standard design in both the Pelton and the Turgo runner simulations. The result show that the greatest improvement in the hydraulic efficiency occurs within the injector with the improved design showing an increase in efficiency of 0.76% for the Turgo 3D injector and 0.44% for the Pelton 3D injector. The results also show that in the case of the 3D injector, the improved injector geometry produces a jet profile which induces better overall runner performance, giving a 0.5% increase in total hydraulic efficiency for the Pelton case and 0.7% for the Turgo case.
AB - This paper uses two modern commercial CFD software packages to compare the performance of a standard and improved impulse turbine injector developed in a previous study. The two injector designs are compared by simulating the 2D axis-symmetric cases as well as full 3D cases including the bend in the branch pipe and the guide vanes. The resulting jet profiles generated by these simulations are used to initialise the inlet conditions for a full Pelton and Turgo runner simulation at different operating conditions in order to assess the impact of the injector design on the performance and efficiency of a real impulse turbine.The results showed that the optimised injector design, with steeper nozzle and spear angles, not only attains higher efficiencies in the 2D and 3D injector simulations, but produces a jet which performs better than the standard design in both the Pelton and the Turgo runner simulations. The result show that the greatest improvement in the hydraulic efficiency occurs within the injector with the improved design showing an increase in efficiency of 0.76% for the Turgo 3D injector and 0.44% for the Pelton 3D injector. The results also show that in the case of the 3D injector, the improved injector geometry produces a jet profile which induces better overall runner performance, giving a 0.5% increase in total hydraulic efficiency for the Pelton case and 0.7% for the Turgo case.
KW - Impulse Turbine Injectors
KW - Pelton-Turgo runner
KW - Hydraulic Efficiency
KW - Numerical Modelling
KW - Computational Fluid Dynamics
KW - Hydropower
KW - Spear valve design
U2 - 10.1115/1.4030628
DO - 10.1115/1.4030628
M3 - Journal article
VL - 137
JO - Journal of Fluids Engineering
JF - Journal of Fluids Engineering
SN - 0098-2202
IS - 11
M1 - 111201
ER -