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Division 3.2.9 Boundary layer thickness

Original text. Later amendments are not shown.

At x = 0 (balance center point), the wind velocity shall have at least 99 per cent of the inflow velocity 30 mm above the wind tunnel floor.

δ99x= 0m≤30mm

where:

δ99

  • is the distance perpendicular to the road, where 99 per cent of free stream velocity is reached (boundary layer thickness).

    • Notes on Division 3

    Textual amendments

    F1

    Substituted by Commission Regulation (EU) 2018/1832 of 5 November 2018 amending Directive 2007/46/EC of the European Parliament and of the Council, Commission Regulation (EC) No 692/2008 and Commission Regulation (EU) 2017/1151 for the purpose of improving the emission type approval tests and procedures for light passenger and commercial vehicles, including those for in-service conformity and real-driving emissions and introducing devices for monitoring the consumption of fuel and electric energy (Text with EEA relevance).