. Applied thermodynamics for engineers. st stroke. By using a long ex-haust pipe, the gases were discharged in a rather violent puff, which pro-duced a partial vacuum in the cylinder. This in turn caused a rush ofair into the clearance space, which swept out the burnt gases by the timethe piston had reached the end of its stroke. Scavenging decreases thedanger of missing ignitions with weak gas, tends to prevent pre-ignition,and appears to have reduced the consumption of fuel. 328. The Suction Stroke. This also is shown in Fig. 137, line cd. Tlie effectof late opening of the valve is shown in
. Applied thermodynamics for engineers. st stroke. By using a long ex-haust pipe, the gases were discharged in a rather violent puff, which pro-duced a partial vacuum in the cylinder. This in turn caused a rush ofair into the clearance space, which swept out the burnt gases by the timethe piston had reached the end of its stroke. Scavenging decreases thedanger of missing ignitions with weak gas, tends to prevent pre-ignition,and appears to have reduced the consumption of fuel. 328. The Suction Stroke. This also is shown in Fig. 137, line cd. Tlie effectof late opening of the valve is shown in Fig. 146; that of an obstructed passageor of throttling the supply, in Fig. 147. If the opening is too early,exhaust gases will enter the supplypipe. If closure is too early, thegas will expand during the re-mainder of the suction stroke, butthe net work lost is negligible; iftoo late, some gas will be discharged -( back to the supply pipe during the ^^^ ^^^ ^^^ Opening ofbeginning of the compression stroke, Suction DIAGRAM FACTOR 201
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