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Preliminary approach towards a CDI system modification operating on neat rapeseed oil

Bialkowski M. T., Pekdemir T., Reuben R., Brautsch M., Towers D. P., Elsbett G.

Journal of KONES

2005

Vol. 12, No. 1-2

31-42

A Common-rail Diesel Injection (CDI) Bosch system was modified to operate on neat rapeseed oil (RSO) in a single tank mode. The performed modifications were derived from the fundamental and comparative injection studies. Laser droplet sizing, high-speed imaging and the Acoustic Emission (AE) tests combined with the basic bench scale experiments were employed to define the main direction of modifications. The RSO pre-heating was found as the most feasible direction of the modification. Some technical constrains were taken into account prior to the modification. The paper indicates on the main direction of the modification and evaluates the preliminary results of the CDI engine tests. Cold start, deposit formation, engine oil deterioration and drivability of a Mercedes Benz 220 C-class car had been investigated to assess the modification. The injection system did not exhibit the same magnitude of undesired effects as previously recorded in similar test with DI Diesel engines. A long-term drive tests provided very promising results on which further modification could be based. The engine test and inspection revealed that RSO pre-heating of successfully alters its properties enabling its successful use in a CDI system.

Effect of fuel temperature and ambient pressure on a common rail rapeseed oil spray

Bialkowski M. T., Pekdemir T., Towers D. P., Reuben R., Brautsch M., Elsbett G.

Journal of KONES

2004

Vol. 11, No. 1-2

53-65

This paper investigated spray characteristics of rapeseed oil (RSO) as renewable fuel for common-rail (OR.) diesel engines using high-speed camera image technique and Phase Doppler Anemometry (PDA). Experimental spray penetration at various injection pressures and fuel temperatures for RSO were compared with data of standard oil (SO) taken at the same varying ambient conditions. Additionally. corresponding to penetration data, data sets of spray development for these two oils were also aquired. It has been found that RSO temperature of 60 graduate C being used in practice to preheat plant oils in modified OR, engines does not improve spray penetration to be sufficient to reach the penetration equivalent at 25 graduate C for SO. It is concluded that producing RSO spray similar to SO one recquires high injection pressure and fuel temperature, and the pressure effect is more influential. The PDA measurements revealed stronger injection pressure effect on values of Ds2 and DID than oil temperature.