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ME2301 Thermal Engineering Scanned Lecture Notes (All 5 Units) - Sreedhar Edition
#1


   
Anna University , Chennai
Department of B.E-Mechanical Engineering
Fifth Semester
ME2301 Thermal Engineering 
(Regulation 2008)
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THERMAL ENGINEERING

UNIT-1
GAS POWER CYCLE
Cycle
Thermodynamic cycle
Power cycles area classified as follows
1. Vapour power cycle
2. Gas power cycle
Different types of air standard cycle
1. Thermal combustion engine cycle
2. External combustion engine cycle
3. Air standard efficiency or ideal efficicency
4. Otto cycle or constant volume cycle
Mean effective pressure
Expression for mean effective pressure of otto cycle
DIESEL CYCLE OR CONSTANT PRESSURE CYCLE
Dual combustion cycle
BRAYTON CYCLE
Basic terms used in IC engine

UNIT-2
IC ENGINE
Heat engine
1. GC engine
2. EC engine
Thermal combustion engines
Classification of IC engine
Working cycle
1. Four stroke engine
2. Two stroke engine
Fuel
1. Petrol engine
2. Diesel engine
3. Gas engine
Thermodynamic cycle
1. Otto cycle
2. Diesel cycle
3. Dual cycle
Speed
1. Low speed engine
2. Medium speed engine
3. High speed engine
Method of cooling
1. Air cooled engine
2. Water cooled
Application
1. Stationary engine
2. Marine engine
3. Automobile engine
4. Motor cycle engine
5. Aero engine
6. Locomotive engine
Method of ignition 
1. Spark ignition engine
2. Compression ignition engine
Arrangement of engine cylinder
1. Horizontal engine
2. Vertical engine
3. V-engine
4. In line engine
5. Opposed cylinder engine
6. Opposed piston engine
7. Radial engine
I.C engine components and function
Comparision of four stroke and two stroke cycle engine
Fuel supply system in IC engine
Carburetor 
Simple carburetor
1. Float and float chamber
2. Venture and throttle value
3. Chope value
Fuel pump
Ignition system
Requirement of a ignition system
BATTERY OR COIL IGNITION SYSTEM
Advantages
Disadvantages
Performance test on IC engine
Indicator diagram
Indicated power
Mean effective pressure (pm)
Brake power
Different arrangement used to fulid brake power
1. Pope brake arrangement
2. Prony brake arrangement
3. Based brake 
Friction power
Mechanical efficiency
Thermal efficiency
Volumetric efficiency
Dynamometer
Problems
Heat balance sheet
Requirement of a good fuel
Knocking

UNIT-3
Steam nozzles
Application
Shape of steam nozzle
Mass flow rate of steam
Critical pressure ratio
Maximum velocity
Velocity diagram for impulse turbine
Problems

UNIT-4

AIR COMPRESSOR
Application
Classification of air compressor
1. According to working
a. Reciprocating air compressors
b. Rotary compression
2. According to action
a. Single acting 
b. Double acting
3. According to number of stages
a. Single stage
b. Multistage compressor
4. Air compressor may further classified as
a. Air pumps and exhauster
b. Blowers and super chargers
c. Air boosters
5. According to the method of cooling
a. Air cooled
b. Water cooled
6. According to number of cylinder
a. Simplex
b. Duplex
c. Triplex
7. According to power drive
a. Direct drive
b. Belt drive
c. Chain drive
8. According to application
a. Rock drill compressor
b. Parameter land tool compressor
c. Sand blasting compressor
d. Spray compressor
9. According to principle of operation
a. Positive displacement compressor
b. Dynamic compressor
10. According to nature of installation
a. Portable
b. Semi fixed
c. Fixed
Problems
Clearance volume

UNIT-5

REFRIGERATION AND AIR CONDUCTING
Types
Unit of refrigeration
Reversed carnot  cycle
Coefficient of performance
Conclusion
Problems
Velocity diagram for impulse turbine
Reactive turbine
Degree of reaction
Steam turbine
Classification of turbine
1. Impulse turbine
2. Reaction turbine
Mass flow rate of system
Critical pressure ratio

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