Turbo machines 2022 scheme VTU University 5th SEM Mechanical Engineering | BME502 notes

Scheme & Syllabus Copy of Turbo machines 2022 scheme

Turbo machines 2022 scheme 5th sem mech notes

MODULE 1 Introduction:

• Definition of turbo machine

• Parts of turbo machines

• Comparison with positive displacement machines

• Classification of turbo machines

• Dimensionless parameters and their significance

• Unit and specific quantities

• Model studies and numerical problems

Note: Since dimensional analysis is covered in the Fluid Mechanics subject, questions on dimensional analysis should not be included. However, dimensionless parameters and model studies should be emphasized.

Thermodynamics of Fluid Flow:

• Application of the first and second laws of thermodynamics to turbo machines

• Efficiencies of turbo machines

• Static and stagnation states

• Overall isentropic efficiency

• Stage efficiency and polytropic efficiency for both compression and expansion processes (comparison included)

• Reheat factor for expansion processes

• Simple numerical problems on stage efficiency and polytropic efficiency

MODULE 2 Energy Exchange in Turbo Machines:

• Euler’s turbine equation and alternate forms

• Velocity triangles for different values of the degree of reaction

• Components of energy transfer

• Degree of reaction and utilization factor

• Relation between degree of reaction and utilization factor

• Numerical problems

General Analysis of Turbo Machines:

• Radial flow compressors and pumps: General analysis

• Expression for the degree of reaction

• Velocity triangles

• Effect of blade discharge angle on energy transfer and degree of reaction

• Effect of blade discharge angle on performance

• General analysis of axial flow pumps and compressors

• Degree of reaction and velocity triangles

• Numerical problems

MODULE 3 Steam Turbines:

• Classification

• Single-stage impulse turbine: Condition for maximum blade efficiency, stage efficiency

• Need and methods of compounding

• Multi-stage impulse turbine: Expression for maximum utilization factor

• Numerical problems

Reaction Turbines:

• Parsons’ turbine: Condition for maximum utilization factor

• Reaction staging

• Numerical problems

MODULE 4 Hydraulic Turbines:

• Classification

• Various efficiencies

Pelton Wheel:

• Principle of working

• Velocity triangles

• Design parameters

• Maximum efficiency

• Numerical problems

Francis Turbine:

• Principle of working

• Velocity triangles

• Design parameters

• Numerical problems

Kaplan and Propeller Turbines:

• Principle of working

• Velocity triangles

• Design parameters

• Numerical problems

• Theory and types of draft tubes

MODULE 5 Centrifugal Pumps:

• Classification and parts of centrifugal pumps

• Different heads and efficiencies of centrifugal pumps

• Theoretical head-capacity relationship

• Minimum speed for starting the flow

• Maximum suction lift

• Net positive suction head (NPSH)

• Cavitation

• Need for priming

• Pumps in series and parallel

• Numerical problems

Centrifugal Compressors:

• Stage velocity triangles

• Slip factor and power input factor

• Stage work

• Pressure developed

• Stage efficiency

• Surging

• Numerical problems