. Applied thermodynamics for engineers. (30 a). One of these rules is, brake hp. =—, where n is the number of four-cycle cylinders of diameter d inches, running at a piston speed of 1000 ft. per minute. Current Gas Engine Forms Cycle Oil Engines. This class includes, among many others, theMietz and Weiss, two-cycle, and the Daimler, Priestman, and Hornsby-Akroyd,four-cycle. In the last-named, shown in Fig. 151, kerosene oil is injected by asmall pump into the vaporizer. Air is drawn into the cylinder during the suctionstroke, and compressed into the vaporizer on the compression st
. Applied thermodynamics for engineers. (30 a). One of these rules is, brake hp. =—, where n is the number of four-cycle cylinders of diameter d inches, running at a piston speed of 1000 ft. per minute. Current Gas Engine Forms Cycle Oil Engines. This class includes, among many others, theMietz and Weiss, two-cycle, and the Daimler, Priestman, and Hornsby-Akroyd,four-cycle. In the last-named, shown in Fig. 151, kerosene oil is injected by asmall pump into the vaporizer. Air is drawn into the cylinder during the suctionstroke, and compressed into the vaporizer on the compression stroke, where thesimultaneous presence of a critical mixture and a high temperature produces theexplosion. External heat must be applied for starting. The point of ignition isdetermined by the amount of compression; and this may be varied by adjusting 212 APPLIED THERMODYNAMICS the length of the connecting rod on the valve gear. The engine is governed bypartially throttling the charge of oil, thus weakening the mixture and the force of. Fig. 151. Arts. 322, 336.—Kerosene Engine with Vaporizer.(From The Gas Engine, by Cecil P. Poole, with the permission of the HUl Publishing Company.) the explosion. The oil consumption may be reduced to less than 1 lb. per brake hour. In the Priestman engine, an earlier type, air under pressure sprayed the oilinto a vaporizer kept hot by the exhaust gases. The method of governing was toreduce the quantity of charge without changing its proportions. A hand pumpand external heat for the vaporizer were necessary in starting. An indicatedthermal efficiency of has been obtained. The Daimler (German) engineuses hot-tube ignition without a timing valve, the hot tube serving as a high speeds are attained. 337. Modern Gas Engines : the Otto. The present-day small Otto engine is ordi-narily single-cylinder and single-acting, governing on the hit or miss principle(Art. 343). It is used with all kinds of gas and with
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