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Daniel Sperrin – Aerodynamics Profile Rider Position

Daniel Sperrin – Aerodynamics Profile Rider Position. Concept Profiles. Streamliner. Dustbin fairing. Concept Profiles. Dolphin fairing. Full fairing. Concept Profiles. Half fairing. Quarter fairing. Belly pan. Drag Calculations: Dimensional analysis.

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Daniel Sperrin – Aerodynamics Profile Rider Position

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  1. Daniel Sperrin – Aerodynamics Profile Rider Position

  2. Concept Profiles Streamliner Dustbin fairing

  3. Concept Profiles Dolphin fairing Full fairing

  4. Concept Profiles Half fairing Quarter fairing Belly pan

  5. Drag Calculations: Dimensional analysis • Suppose the problem of drag force is dependant on: • air speed, u • fluid density, ρ • kinematic viscosity of air, ν • size of the body expressed as frontal area, A • drag force, Fd • Using Buckingham Pi theorem, these variables reduce to 2 dimensionless groups: • Cd = Fd/(0.5 ρAu²) Drag coefficient • Re = u(sqrt(A))/v Reynold’s number • Leading to Fd = 0.5 ρu²CdA

  6. Range of conventional motorcycles Target value of CdA = 0.3 – corresponds to power of 48kW

  7. Software - Cosmos Following consultation with my tutor, I have decided to model the profile of the motorcycle using Solidworks, and to then run the fluid simulation using the Cosmos software included in Solidworks.

  8. Provisional Individual Milestones • Make a recommendation for the profile material – 03/12/10 • Begin to experiment with software modelling (dependant on whether there is access to the software over the vacation) – before Christmas • If this is possible, use this research as a basis to establish some concept designs – 10/01/11 (Monday 0th) • If the above is not possible, continue to research previously used profiles and aerodynamics literature to establish some concept designs – 10/01/11 (Monday 0th)

  9. Provisional Individual Milestones • Establish the framework required to accommodate the rider within this profile – 17/01/11 (Monday 1st) • Build the models in Solidworks ready to be modelled in Cosmos – 31/01/11 (Monday 3rd) • Carry out modelling, and consider refinements – 07/02/11 (Monday 4th) • Carry out model of final design and make recommendations to other team members – 14/02/11 (Monday 5th) • Begin write up

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