SMX® Ocean Submarine (concept)
AIP System Performance
AIP Power Calculation

 

The following is a study on SMX® Ocean submarine hydrodynamics, with emphasis on requirements for design second generation air independent propulsion (AIP) system.
This presentation covers the calculation of AIP power that has to provide the given SMX® Ocean submarine performances (submerged speed, endurance, and range).
At the 27th of October 2014 the French Industrial Group Direction des Constructions Navales & Service (DCNS) announced a concept of a new Conventional AIP submarine – SMX® Ocean. The boat was represented on the first day of the 24th International Naval Defense & Maritime Exhibition & Conference “EURONAVAL 2014” in Le Bourget (France).

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The representative of DCNS had given the following brief descriptions of SMX® Ocean submarine concept (DCNS Press Release. Paris, 28 October 2014).

At Euronaval 2014, DCNS is unveiling the SMX Ocean conventionally powered attack submarine. The new vessel draws extensively on the design of a state-of-the-art nuclear-powered submarine, with a number of key innovations that give this diesel-electric adaptation truly outstanding performance.

This innovative concept ship promises submerged endurance and deployment capabilities that are unprecedented for a conventional- propulsion submarine. With up to three months’ endurance, an SMX Ocean could cross the Atlantic six times without surfacing. Its transit speed is up to 14 knots.

To achieve this level of performance, DCNS teams have developed and combined a number of innovations including a high-performance air- independent propulsion (AIP) system using second- generation fuel cells for submerged endurance of up to three weeks.

The SMX Ocean features the same combat system, provisions for special forces’ missions, masts and general layout as the Barracuda SSN.

SSN BARRACUDA LAYOUT

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SSN BARRACUDA HULL

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SSN Barracuda (Suffren class) French nuclear powered submarine

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SSN Barracuda (Suffren class) model

STANDARD MODEL OF SUBMARINE HULL

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M. Mackay The Standard Submarine Model: A Survey of Static Hydrodynamic Experiments and Semiempirical Predictions. Defence R&D Canada — Atlantic Technical Report DRDC Atlantic TR 2003—079 June 2003

http://esrdc.mit.edu/library/ESRDC_library/Mackay-Standard-Submarine-2003.pdf

STANDARD MODEL OF SUBMARINE HULL

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STANDARD MODEL OF SUBMARINE HULL

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SMX® Ocean SUBMARINE MODEL VIEWS

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In accordance with DCNS group presentation, the general view of submarine SMX® Ocean shows that in contrast to SSN Barracuda the boat contains:

  • Special superstructure located behind conning tower;
  • Two diving planes;
  • Propeller instead of jet pump;

SMX® Ocean AIP POWER CALCULATION

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SMX® Ocean AIP POWER CALCULATION RESULT

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CONCLUSIONS

As it follows from DCNS group announcement: This innovative concept ship promises submerged endurance and deployment capabilities that are unprecedented for a conventional-propulsion submarine. With up to three months’ endurance, an SMX® Ocean could cross the Atlantic six times without surfacing. Its transit speed is up to 14 knots.
To achieve this level of performance, DCNS teams have developed and combined a number of innovations including a high-performance air- independent propulsion (AIP) system using second- generation fuel cells for submerged endurance of up to three weeks.

To reach such results the SMX® Ocean AIP power plant has to have power output of 1.8MWe. It is reasonable and attainable value.

 

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