. Automotive industries . ylinder is used as a precomprcssor and forces intothe high pressure cylinders a much greater amount ofcharge than could be gotten in by suction. Owing to thisprecompression and the resulting supercharging the com-pression space is not nearly so flat as in the ordinary Dieselengine, and the proportion of surface or cooling area tovolume of compression space is therefore much in the regular Diesel cycle, nothing but air is drawninto the precompressor and transferred to the compressionchamber of the high pressure cylinder. When the pistonin the latter reaches
. Automotive industries . ylinder is used as a precomprcssor and forces intothe high pressure cylinders a much greater amount ofcharge than could be gotten in by suction. Owing to thisprecompression and the resulting supercharging the com-pression space is not nearly so flat as in the ordinary Dieselengine, and the proportion of surface or cooling area tovolume of compression space is therefore much in the regular Diesel cycle, nothing but air is drawninto the precompressor and transferred to the compressionchamber of the high pressure cylinder. When the pistonin the latter reaches the top of the stroke, fuel is injectedby a solid injection mechanism in the center of the cylinderhead and the mixture ignites spontaneously owing to theheat of compression. The explosion pressures normallyattained are in the neighborhood of 900 lbs., per sq. are pressures usually associated with detonation, andSperry claims to have solved the problem of harnessingthe detonation and turning it to useful The Supercharged Compound Diesel Type Engine,Described by Sperry. In the high pressure cylinders the charge is expandeddown to about 300 lbs. per sq. in., and it is then trans-ferred to the low pressure cylinder. The two high pres-sure cylinders are set to explode alternately at equal in-tervals, working on cranks in the same plane. Using thehigh pressure cylinders only, Sperry stated, he obtainedonly 29 hp., while with the low pressure cylinder operat-ing in addition the output was increased to 200 hp. Inreply to a question by Dr. Miller as to whether any troublewas experienced from sulphur in the fuel, Mr. Sperry saidthat it was necessary to keep the exhaust temperatureabove the temperature of water condensation. Mean effec-tive pressures of from 62 to 75 lb. per sq. in. are number of indicator cards from the engine, obtainedwith an ordinary piston type of indicator, were thrown onthe screen, and emphasis was laid on the fact that thecombustion l
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
