BASF engine

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A BASF engine is a single-cylinder test engine for determining the ignitability of diesel fuels . The ignition delay depends to a large extent on the ignitability of the diesel fuel. The ignitability of diesel fuel is described by the cetane number (CZ). The cetane number is the volumetric proportion of cetane C 16 H 34 (n-hexadecane) in a mixture with α-methyl naphthalene C 11 H 10 . Pure cetane is the paraffinic reference fuel with CZ = 100. The diesel fuel to be checked with the same ignition delay time as a certain test fuel mixture also has the same cetane number. The cetane number is determined in the single-cylinder CFR test method or in the BASF engine.

The BASF engine was developed by BASF in 1964 .

method

  1. At the beginning of the test, the start of injection of the test engine at operating temperature is measured to exactly 20 ° CA by means of a mechanical injection adjuster on the injection pump. OT posed.
  2. The ignition delay target value for the fuel to be tested is set by continuously throttling the intake air so that ignition takes place exactly at TDC.
  3. The injection rate is set to 8 ml / min and the previous settings are checked.
  4. If the ignition delay remains constant within one minute, the value of the air knife (intake manifold pressure) is noted, otherwise the settings made on the test engine are repeated.
  5. The test procedure is then repeated for two reference fuels with a known cetane number, mixtures of cetane and α-methyl naphthalene. One of the two reference fuels has a lower and the other a higher cetane number than the fuel sample.
  6. The cetane number of the fuel sample is then determined by linear interpolation .
  7. Alternatively, a calibration curve can also be used. For this purpose, several reference fuels are measured and an interpolation polynomial of the 2nd degree is set up. The cetane number you are looking for can then be calculated using the polynomial.
Data of the test engine
technical features BASF engine (DIN 51773)
Combustion process Vortex chamber
Compression ratio fixed (18.2)
Speed ​​min −1 1000
Start of injection ° KW v. OT 20th
Start of combustion Top Dead Center
Ignition delay setpoint ° CA 20th
Adjust ignition delay through Throttling of the intake air

Web links

Individual evidence

  1. ^ Richard van Basshuysen, Fred Schäfer: Handbook Internal Combustion Engine: Fundamentals, Components, Systems, Perspectives . 4th update u. exp. Edition. Vieweg, 2007, ISBN 978-3-8348-0227-9 , pp. 806 .
  2. ^ Franz Pischinger: Internal combustion engines. Lecture reprint, Chair for Applied Thermodynamics, RWTH Aachen University, 1987.
  3. ↑ DIN 51773: Testing of liquid fuels - Determination of the ignitability (cetane number) of diesel fuels with the BASF test engine , Beuth-Verlag, Berlin, April 2010.
  4. ↑ Remotelab , on energia.bme.hu, accessed on September 8, 2017.
  5. ↑ Krüger testing machines: Cetane number measurement on the BASF test diesel , operating instructions , edition C, 1966.