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Rapid Compression Machine






The experimental apparatus can be divided into several systems such as rapid compression machine, single-shot common rail system, data acquisition systems and exhaust emission measurement systems.

The general schematic diagram of experiment apparatus is shown in Fig.2. A free-piston type rapid compression machine (RCM) was used to simulate diesel combustion in a constant volume over a wide range of ambient temperature and pressure conditions similar to actual diesel engines. In addition, systems were added with the exhausts analyzer to observe the exhaust emissions and the in-chamber pressure data are acquired with piezoelectric pressure transducer.

  High sensitivity photograph High intensity photography
Lens AI Nikkor 50 mm F1.4S Nikon AI AF DC-Nikkor 135mm F2D Nikon
Photography distance [mm]    
Aperture [μ s] 1, 4  
Shutter speed    
Lighting NIL Halogen 500W x 4
Steradian at the lens diaphragm position [sr] 3.70E-03 3.17E-05
Relative light quantity Ratio    

Table 1 Photography conditions

The spray chamber was disc type with a diameter of 60mm and a width of 20mm. Measurement were made in an optically-accessible with one of the base surfaces of the chamber was composed of pyrex glass to observe spray and flame developments, and the other side surface had an injector holder.

Fig.2 Schematic diagram of experimental apparatus

During experiment, the fuel injection is varied by controlling the common rail system. Nevertheless, the ambient condition of the combustion chamber was controlled by the air motion and temperature. Piston (aluminum 17ST-4) motion induced air inside the chamber. The RCM has a portable swirler at intake ports which allow the amount of swirl to be varied at 10-60 m/s by changing the port inclination angle controlled swirl velocity. Base swirl velocity rs was rs =19 m/s in this study.






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