Optimized Blade Design of Counter-Rotating-Type Pump-Turbine Unit Operating in Pump and Turbine Modes

<table class="fixed-width table-group" id="tab2"><tr><td><table class="table"><colgroup><col style="width:7.86em"/><col style="width:7.89em"/><col style="width:7.91em"/></colgroup><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr class="thead"><td class="align_left">Design variables</td><td class="align_center">Lower bound (°)</td><td class="align_center">Upper bound (°)</td></tr><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr><td class="align_left">4B_hub</td><td class="align_center">0</td><td class="align_center">4</td></tr><tr><td class="align_left">4B_tip</td><td class="align_center">0</td><td class="align_center">4</td></tr><tr class="table-tr"><td colspan="3"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

International Journal of Rotating Machinery

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Table 2

Table 2: Optimized Blade Design of Counter-Rotating-Type Pump-Turbine Unit Operating in Pump and Turbine Modes 