STEAM NOZZLES AND TURBINES Flow of steam through nozzles, shapes of nozzles, effect of friction, critical pressure ratio, supersaturated-flow. Impulse and reaction principles, compounding, velocity diagrams for simple and multistage turbines, speed regulations-governors and nozzle governors. Numerical Problems. STEAM NOZZLES AND TURBINES Some Technical Terms : 1. Wet steam : The steam which contains some water particles in superposition. 2. Dry steam / dry saturated steam : When whole mass of steam is converted into steam then it is called as dry steam. 3. Super heated steam : When the dry steam is further heated at constant pressure, the temperature increases the above saturation temperature. The steam has obtained is called super heated steam. 4 . Degree of super heat : The difference between the temperature of saturated steam and saturated temperature is called degree of superheat. 5. Nozzle :It is a duct of varying cross sectional area in which
