ME- 305 E FLUID MACHINES
ME- 305 E FLUID MACHINES
Sessional : 50 Marks
Theory : 100 Marks
Unit I Impact of free jets: Impulse – momentum principle, jet impingement - on a stationary flat plate, inclined plate and a hinged plate, at the center of a stationary vane, on a moving flat plate, inclined plate, a moving vane and a series of vanes, Jet striking tangentially at the tip of a stationary vane and moving vane(s), jet propulsion of ships. Problems
Unit II Impulse Turbines: Classification – impulse and reaction turbines, water wheels, component parts, construction, operation and governing mechanism of a Pelton wheel, work done, effective head, available head and efficiency of a Pelton wheel, design aspects, speed ratio, flow ratio, jet ratio, number of jets, number of buckets and working proportions, Performance Characteristics, governing of impulse turbines. Problems
Unit III Francis Turbines: Component parts, construction and operation of a Francis turbine, governing mechanism, work done by the turbine runner, working proportions and design parameters, slow, medium and fast runners, degree of reaction, inward/outward flow reaction turbines, Performance Characteristics, Problems.
Unit IV Propeller and Kaplan turbines: Component parts, construction and operation of a Propeller, Kaplan turbine, differences between the Francis and Kaplan turbines, draft tube – its function and different forms, Performance Characteristics, Governing of reaction turbine, Introduction to new types of turbine, Deriaz ( Diagonal ), Bulb, Tubular turbines, Problems.
Unit V Dimensional Analysis and Model Similitude: Dimensional homogeneity, Rayleigh’s method and Buckingham’s π-theorem, model studies and similitude, dimensionless numbers and their significance. Unit quantities, specific speed and model relationships for turbines, scale effect, cavitations – its causes, harmful effects and prevention, Thomas cavitation factor, permissible installation height, Problems.
Unit VI Centrifugal Pumps: Classification, velocity vector diagrams and work done, manometric efficiency, vane shape, head capacity relationship and pump losses, pressure rise in impeller, minimum starting speed, design considerations, multi-stage pumps. Similarity relations and specific speed, net positive suction head, cavitation and maximum suction lift, performance characteristics. Brief introduction to axial flow, mixed flow and submersible pumps, Problems.
Unit VII Reciprocating Pumps: Construction and operational details, discharge coefficient, volumetric efficiency and slip, work and power input, effect of acceleration and friction on indicator diagram (pressure – stroke length plot), separation, air vessels and their utility, rate of flow into or from the air vessel, maximum speed of the rotating crank, characteristic curves, centrifugal vs reciprocating pumps, brief introduction to screw, gear, vane and radial piston pumps, Problems.
Unit VIII Hydraulic systems: Function, construction and operation of Hydraulic accumulator, hydraulic intensifier, hydraulic crane, hydraulic lift and hydraulic press, Fluid coupling and torque converter, Hydraulic ram, Problems.
Text Books :
Hydraulics & Fluid Mechanics – Modi & Seth, Pub. - Standard Book House, N.Delhi
Hydraulic Machines – Jagdish Lal, Metropolitan
Reference Books :
Fluid Mechanics and Hydraulic Machines – S S Rattan, Khanna Publishers
Introduction to Fluid Mechanics and Fluid Machines – S K Som and G Biswas, Tata McGraw Hill
Fluid Mechanics and Fluid Power Engineering – D S Kumar, S K Kataria and Sons
Note:
In the semester examination the examiner will set 8 questions, at least one question from each unit. Students will be required to attempt 5 questions.
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