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Prime Movers
Published in A.J. Pansini, K.D. Smalling, Guide to Electric Power Generation, 2020
The simplified type of reciprocating steam engine is known as the Slide-D-valve engine, using but one steam cylinder, and may be either horizontal or vertical. Figure 5-4 (a) and (b) represents this type of engine. The D-slide-valve alternately admits steam to and releases the steam from each end of the cylinder. The valve has a reciprocating motion. The piston is moved by the pressure of the steam admitted to the cylinder. At some point of the piston stroke the valve completely closes the supply port and the flow of steam is cut off. After cut off has taken place the pressure within the cylinder decreases owing to the expansion of the steam Energy stored in the heavy flywheel during the period of steam admission is used to maintain the stroke. Figure 5-5.
Performance enhancement of camless air engine by optimising the inlet-valve cut-off position
Published in International Journal of Ambient Energy, 2022
Nikhilkumar Jagjivanbhai Chotai, Vivek Patel, Vimal Savsani, Motwani Karan
At the beginning of the stroke, the crank angle was set at 0° (piston at TDC in the cylinder) manually. As per the air engine's theoretical cycle condition, the air supply starts through the inlet port at exact 0° and at the same time piston moves downwards, and the inlet valve closes at 180° and cut off the compressed air supply. At 180°, exhaust valve opens, and the air starts to discharge from the valve with the piston's upward movement. At 360° of crank angle, the exhaust valve closes and thus completes one cycle. Considering the limitation of feedback sensors and controller, it is not possible to operate a solenoid valve exactly at the predefined position of crank angle, and thus, a tolerance value is provided as SL.