Mindblown: a blog about philosophy.

The indicator diagram is a representation of the variations of pressure and volume of steam inside the cylinder on p-V diagram for one complete cycle of operation. The theoretical p-v diagram for a single acting steam engine is shown in Fig. 5.7 without and with clearance. The sequence of operations is as follows: Process 1-2: The steam is supplied to…

In modified Rankine cycle to reduce friction the stroke length is reduced. Figure 5.6(a) and 5.6(b) show the modified Rankine cycle on p-v and T-s diagrams respectively, by neglecting pump work. It may be observed that p-v diagram is very narrow at the toe. i.e., point 3′. The work obtainable near to 3′ is very small which is too inadequate to overcome friction…

Rankine cycle is the theoretical cycle on which the steam engine works. The Rankine cycle is shown in Fig. 5.4. The p–v, T–s and h–s diagram for the Ranking cycle are shown in Fig. 5.5. Figure 5.4 Rankine cycle Figure 5.5 Rankine cycle in various ordinates: (a) p-v diagram, (b) T-s diagram, (c) h-s diagram The various processes of Rankine cycle are: Process 1-2: Reversible…

The working of a double acting steam engine is a shown in Fig. 5 3. As the piston reaches the inner dead centre (IDC) position A, the D-slide valve clears the inlet port C and admits the steam into the cylinder. This high pressure steam pushes the piston on the forward direction and performs work by rotating the…

A line diagram of steam engine mechanism is shown in Fig. 5.2. Cylinder Bore, D: It is the inside diameter of the cylinder Piston stroke, L: It is the distance travelled by the piston from the cover end of the cylinder to the crank end of cylinder. L = 2r. Single Acting: Steam is supplied on one side of piston only Double acting: Steam…

The various parts are briefly described below: Frame: It is a heavy casting made of cast iron and supports cross-head guides and main bearing. It generally rests on the engine foundation. Cylinder: It is also a casting to the frame in which the piston reciprocates. Its both ends are closed and made steam tight. The…

A schematic line diagram of a vertical steam engine is shown in Fig. 5.1, The parts of a steam engine may be broadly classified as:

A steam engine is of the reciprocating type, in which the piston moves to-and-fro in the cylinder due to the force applied by the expansion of steam. The reciprocating steam engines may be classified as follows:

A steam engine uses steam as the working medium. It is the earliest prime mover developed to convert thermal energy into mechanical energy. It is called a prime mover because it is used to drive other devices like locomotives, compressors, lathe, shear presses, etc. On account of their low efficiency steam engines have become obsolete.…