Abstract: A gas-liquid separator of one aspect of the invention comprises; an inflow barrel; a main cylindrical barrel on downstream of the inflow barrel, which has an inner barrel duct and is constructed to induce rotational momentum on to-be cleaned gas having flown in from the inflow barrel; a plurality of subordinate cylindrical barrels that have diameters smaller than that of the main cylindrical barrel and are serially connected as adjoined to downstream end of the main cylindrical barrel; a connector cylindrical barrel that has diameter smaller than those of the subordinate cylindrical barrels and connects inside spaces of the subordinate cylindrical barrels; and liquid receivers on beneath of the subordinate cylindrical barrels; and an outflow barrel at downstream end of the series of the subordinate cylindrical barrels.

Abstract: A combustion improving device and a combustion improving method for an engine improves the combustion of an internal combustion engine such as a Diesel engine and can reduce noxious emissions, such as sooty smoke, or nitrogen oxides. To achieve this, magnetic poles of two magnets 2 are arranged in proximity to confront each other, so that fuel fed from a fuel tank to the engine is guided to pass through a gap 3 between the magnetic poles. At this passage, magnetic force (an attractive force or a repulsive force) per unit area to act between the confronting magnetic poles is set at 0.15 kgf/cm2 or more, and a time period for the fuel to pass between the confronting magnetic poles is set at 1.7 seconds or more.