Cold Startability of Open-Chamber Direct-Injection Diesel Engines-Part I I: Combustion Chamber Design and Fuel Spray Geometry and Additional Air and Glow Plug as a Starting Aid 831396

A study was performed to evaluate the influence of combustion chamber design and fuel spray geometry on cold startability.
High-squish toroidal, high-squish bowl, and Mexican hat-type combustion chambers were tested. In each case, the effects of fuel-air mixing process on cold startability was studied at different starting temperatures and injection timings.
Cold startability aids, such as additional air for starting purposes and glow plugs, were tested with each of the above combustion chambers.
Chamber designs with high squish and swirl and fuel impingement on the walls were found to be undesirable for good cold startability. Improved cold startability resulted from locally non-uniform air-fuel ratios with a well organized air swirl-fuel spray pattern. Glow plugs were found to be desirable for improved cold startability.


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