@article{Aero-derivative:10629,
      author = {Portanier, R},
      url = {http://library.imarest.org/record/10629},
      journal = {Conference Proceedings of INEC},
      title = {Zero-staging the Aero-derivative Marine Gas Turbine for a  Step-Change Increase in Power Rating.},
      abstract = {Navies that sought to upgrade their fleet?s mission  capability and increase their on-board load usually  resorted to increasing the ship?s propulsive power. When  the ship?s prime mover was a gas turbine, this could be  done by zero-staging the existing gas turbine compressor.  An aero-derivative gas turbine for marine propulsion was a  prime candidate for zero-staging because it retained its  original attributes of high power-to-weight ratio,  compactness, fast start-up, and variable power output. A  successful zero-staged compressor gave a step-increase in  power with minimal changes to the original inlet while  keeping the remainder of the installation intact. As a  result, the development costs were relatively less when  compared to a new replacement design with a higher power  rating. The purpose of this paper is to discuss a  zero-staged design method for an aero-derivative marine gas  turbine for an improvement in performance and an increase  in power output. Here, a sequential approach was taken when  carrying out the synthesis, with the completion of each  sequence serving as a gate keeper prior to proceeding to  the next sequence. This resulted in the formulation of a  method that assessed the feasibility of zero staging the  gas turbine at the initial design phase by applying basic  calculations. The simplicity of the proposed method  permitted the sole use of a spreadsheet instead of the  established practice of complex numerical analyses with  extensive batch data processing on a computer server. The  intent was to ensure the viability of the zero-stage design  at the preliminary investigative phase in a simplistic  manner prior to committing to a fully-fledged design  project of significant cost. This approach was used as a  case study on an existing medium-size aero-derivative gas  turbine suitable for marine use, namely the Rolls-Royce  Trent 60 Siemens SGT-A65 gas turbine. Zero-staging gave a  17% increase in power output, from 77,000 shp to 90,000  shp.},
      doi = {https://doi.org/10.24868/10629},
      recid = {10629},
      address = {2022-09-04},
}