Svenska Rotor Maskiner Aktiebolag

Oktan Ab

Lennart Forslund

Jan Wicen

Orjan Nilsson

Raoul Niklasson

In a spark-ignition internal combustion engine of the type having a combustion chamber which presents at least one surface area on which there is applied at least one layer which presents to the combustion chamber a layer defining surface having very low reflectivity to electromagnetic waves in the wavelength range of about 0.2-7.0 microns. The layer reflects non-absorbed incident waves in a diffuse fashion, thereby to reduce the octane number requirement of the engine. The total surface area thus treated for each combustion chamber of the engine is equal to at least 10% of the top surface area of the piston in said chamber. The overall efficiency of the engine can be further improved when at least one of the layers has an underlying defining surface distal from the combustion chamber which reflects substantially all incoming electromagnetic waves in the wavelength range above 2.5 microns in a diffuse fashion.

Internal combustion engine having low octane number requirements

An ejector pump has a ringshaped nozzle slot directed radially outwards followed by a radially directed mixing zone interacting with a secondary channel and a radially directed diffuser slot. To achieve an improved performance, and especially one having a characteristic less dependent to decreases of working medium pressure the ejector pump is comprised of two mutually fixed blocks (1, 2) having each an end surface (4, 6). Said end surfaces (4, 6) are facing each other forming an annular slot (12). The surfaces of the nozzle slot and the diffuser slot are profiled in at least one of said end surfaces (6) separated by an annular groove (7) in said end surface, which groove (7) communicates with the secondary channel. The diffuser slot height adjacent the groove (7) is larger than the nozzle slot height (h.sub.o) adjacent said groove decreasing outwardly by the way of at least two bevels, first one having an angle of bevel .alpha..sub.1 =8.degree.-15.degree. and then one having an angle of bevel=4.degree.-8.degree., the ratio .alpha..sub.1 /.alpha..sub.2 amounting to 1.25-3.25 and each bevel .alpha..sub.2 having a width of at least 0.5 times the smallest width of the groove followed by an annular slot portion height (h.sub.1) amounting to 0.84-0.97 times the nozzle slot height (h.sub.o) adjacent the groove (7) along a distance of at least 0.8 times the smallest width of the groove (7) beginning at a distance of at most 4.9 times the smallest width of the groove from the outermost edge of nozzle (21).

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Upsala, Sweden

Lennart Forslund