Common use of Initial Design Clause in Contracts

Initial Design. ADT’s TURBOdesign suite [1] was used to create the initial design of the Shaft-Driven Counter-Rotating Pump-Turbine (SD-CRPT) in prototype scale. The software uses a 3D inverse design method [2], [3], [4] to design the blade shape for a given distribution of blade loading (pressure jump across the blade). It can be used for axial, mixed flow or centrifugal configurations and can easily handle contra-rotating stages. The target design for TURBOdesign was a machine with a power of 10 MW in turbine mode and a head of 9 m at the Best Efficiency Point (BEP). Initially a meanline sizing code TURBOdesign Pre was used to generate the initial flow path (hub and shroud diameter and chord distribution of the first and second rotor) based on specification of flow rate, rpm and head of 9 m. The resulting flow path was then used in the inverse design method with appropriate choice of blade loading to generate the first and second rotor 3D blade geometries. The performance of the initial stage was then verified by full 3D steady RANS computations which confirmed that the design meets the required head and power levels at reasonably high level of efficiency.