Van Nostrand's engineering magazine . e forward, andthe air expands doing work. At the endof the stroke the pressure has fallen lbs. per square inch above the atmos-phere. 1 cubic foot of sir (17° Centigrade,and 760 millimeters mercury) atconstant volume requires to heat it ! 24,416from the temperature of compres- | 150°.5 Centigrade to 1,537°Centigrade heat, equivalent to THE THEORY OF THE GAS ENGINE. 357 Maximum pressure in lbs. per square ) OO0 ,. inch above atmosphere ) Pressure at end of stroke lbs. Mean pressure during available ) lbs. per part of stroke f sq
Van Nostrand's engineering magazine . e forward, andthe air expands doing work. At the endof the stroke the pressure has fallen lbs. per square inch above the atmos-phere. 1 cubic foot of sir (17° Centigrade,and 760 millimeters mercury) atconstant volume requires to heat it ! 24,416from the temperature of compres- | 150°.5 Centigrade to 1,537°Centigrade heat, equivalent to THE THEORY OF THE GAS ENGINE. 357 Maximum pressure in lbs. per square ) OO0 ,. inch above atmosphere ) Pressure at end of stroke lbs. Mean pressure during available ) lbs. per part of stroke f square inch. Temperature at middle of stroke [- centi^ at end of .648 CentigradeWork done on the 11,090 foot-lbs Duty of engine -———,=* 24,416 The relative work obtained from 1cubic foot of air heated to the assumedtemperature is shown below. results FROM OF EQUAL VOLUME SWEPT BY MOTOK 1. 5,781 foot-lbs. work obtained duty. 2. 11,769 0 30 • 3. 11,090 9 10 1 1 cubic foot. 8 9 102 cubic feet Atmo-sphereline. Fig. 5 shows the most important modi-fication of this type; in it, instead of aseparate reservoir, a space is left at theend of the cylinder, into which the pistondoes not enter, and in this, space is compressed the gases forming the inflamma-ble mixture. The rise in pressure there-fore commences at the beginning of thestroke instead of when the piston has That is, in an engine of type 1, if 100heat-units be used, 21 units will be converted into mechanical work. In type 2,with the same amount of heat, 36 unitswill be given as work, and in type 3 noless than 45 units would be convertedinto work. The great advantage of compressionover no compression is clearly seen, by £50 c200 150 o . 1^50Sc £ o 1 I537C ? ^_J_ 0 1 ? ! H i > ( f I 1 0 1 s 1 : i t 7 8 I 10 PARTS OF THE STBOKE. traveled out. In this diagram the volumeswept by the piston and the clearancespace together are supposed to
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
