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Division 3.2.8 Air pressure

Original text. Later amendments are not shown.

At nine equally distributed points over the nozzle outlet area, the standard deviation of the total pressure at the nozzle outlet shall be equal to or less than 0.02.

σ ΔPtq≤0,02

where:

σ

  • is the standard deviation of the pressure ratio ΔPtq;

    • ΔPt

  • is the variation of total pressure between the measurement points, N/m2;

    • q

  • is the dynamic pressure, N/ m2.

    • The absolute difference of the pressure coefficient cp over a distance 3 metres ahead and 3 metres behind the centre of the balance in the empty test section and at a height of the centre of the nozzle outlet shall not deviate more than ± 0,02.

    cpx=+ 3m− cpx=− 3m≤0,02

    where:

    cp

  • is the pressure coefficient.

    • 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).