Synthesis procedure and combustion chamber with variable turbulence

Claim 1

A combustion structure for an internal combustion engine having a cylinder formed with an end wall and a piston displaceable in said cylinder toward and away from said end wall, said combustion structure comprising: a piston cavity concave toward said end wall and formed on said piston; a projection on said piston laterally offset from said cavity and having a plurality of surfaces of respective inclinations while being concave in the direction of said end wall; a cavity formed in said end wall, aligned with said projection and opening toward said piston, said cavity in said end wall and the concavity of said projection defining during an injection, ignition and combustion phase of a cycle of said piston and said cylinder, a combustion compartment so shaped that said surfaces of said projection induce at least three distinct swirls of fluid in said chamber to collectively generate a three-dimensional circulation over the entire chamber; at least one fuel injector opening into said cavity in said end wall for introducing fuel into said circulation for mixture with said fluid; ignition means in said chamber for igniting the mixture of fuel and fluid formed in said circulation; and wherein said projection includes three angularly adjoining surfaces, two of said surfaces being mirrorsymmetrical with respect to one another and the other of said surfaces lying substantially at right angles to the mirrorsymmetrical surfaces, said mirrorsymmetrical surfaces being inclinded to the direction of displacement of said piston at one angle and the other surface being inclined to the direction of displacement at another angle.