Thermal Engineering-I Syllabus
UNIT–I: Power Cycles and IC Engines Classification
Power Cycles
- Otto Cycle
- Atkinson Cycle
- Diesel Cycle
- Dual Cycle
- Representation of cycles on P–V and T–S diagrams
- Mean Effective Pressure (MEP)
- Thermal efficiency on air-standard basis
- Comparison of Otto, Diesel and Dual cycles
- Actual cycles
- Comparison of actual and ideal cycles
IC Engine Classification
- Classification of Internal Combustion Engines
- Working principles of:
- Two-stroke engines
- Four-stroke engines
- SI engines
- CI engines
- Valve timing diagrams
- Port timing diagrams (JNTU Hyderabad)
UNIT–II: Combustion in SI Engines
- Types of SI engines
- Engine systems
- Carburetors
- Fuel-injection systems for SI engines
- Fuel-injection systems for CI engines
- Ignition systems
- Cooling systems
- Lubrication systems
- Fuel properties
- Combustion stoichiometry
- Normal combustion in SI engines
- Abnormal combustion
- Flame speed
- Effect of engine variables on combustion
- Pre-ignition
- Knocking in SI engines
- Fuel requirements
- Fuel rating
- Anti-knock additives
- Combustion chamber requirements (JNTU Hyderabad)
UNIT–III: Combustion in CI Engines
- Types of CI engines
- Four stages of combustion in CI engines
- Ignition delay period
- Importance of delay period
- Effect of engine variables
- Diesel knock
- Need for air movement
- Suction-induced turbulence
- Compression-induced turbulence
- Combustion-induced turbulence
- Open combustion chambers
- Divided combustion chambers
- Fuel-injection systems
- Diesel fuel requirements
- Fuel rating (JNTU Hyderabad)
UNIT–IV: Testing and Performance of IC Engines
Performance Parameters
- Engine performance parameters
- Measurement of cylinder pressure
- Fuel consumption measurement
- Air-intake measurement
- Exhaust-gas composition
Power Measurement
- Brake Power
- Indicated Power
- Frictional Power / Frictional Losses
Engine Testing
- Performance tests
- Evaluation of engine performance
- Heat balance sheet
- Heat balance chart (JNTU Hyderabad)
UNIT–V: Compressors
Introduction and Classification
- Classification of compressors
- Fans
- Blowers
- Compressors
- Positive-displacement compressors
- Dynamic compressors
- Reciprocating compressors
- Rotary compressors
Reciprocating Compressors
- Principle of operation
- Work required
- Isothermal efficiency
- Volumetric efficiency
- Effect of clearance volume
- Multistage/staged compression
- Intercooling/under-cooling
- Saving of work
- Minimum-work condition for staged compression
Rotary Compressors
- Roots blower
- Vane-sealed compressor
- Mechanical details
- Working principles
- Efficiency considerations
Centrifugal Compressors
- Mechanical details
- Principle of operation
- Velocity and pressure variation
- Energy transfer
- Impeller blade shapes
- Losses
- Slip factor
- Power-input factor
- Pressure coefficient
- Adiabatic coefficient
- Velocity diagrams
- Power calculations
Axial-Flow Compressors
- Mechanical details
- Principle of operation
- Velocity triangles
- Energy transfer per stage
- Degree of reaction
- Work-done factor
- Isentropic efficiency
- Pressure-rise calculations
- Polytropic efficiency (JNTU Hyderabad)
JNTUH Course Objectives
The official R25 syllabus emphasizes five major objectives:
- Understand the components and systems of IC engines.
- Analyze combustion stages to improve fuel economy and emission control.
- Evaluate the performance of major IC-engine components and systems.
- Understand rotary, reciprocating, dynamic and axial compressors.
- Understand the significance and working of gas turbines in power generation. (JNTU Hyderabad)
Important observation for your Tech Talents course
There is a small but important point: Gas turbines are mentioned in the official course objectives, but the detailed Unit I–V syllabus provided by JNTUH does not contain a separate Gas Turbines unit. The detailed syllabus ends with compressors in Unit V. (JNTU Hyderabad)
Thermal Engineering – I | JNTUH R25 | B.Tech Mechanical Engineering
Concept-based and examination-oriented one-to-one training covering IC engine cycles, SI and CI engine combustion, engine testing and performance, reciprocating and rotary compressors, centrifugal compressors and axial-flow compressors, aligned with the latest JNTUH R25 curriculum.
JNTUH’s R25 curriculum also includes a separate Thermal Engineering-I Laboratory (ME409PC) in the same semester, covering IC-engine performance tests, Morse/retardation/motoring tests, heat balance, air-fuel ratio effects, variable-compression-ratio engine testing, compressor volumetric efficiency, engine dismantling/assembly and boiler study. (JNTU Hyderabad)
Official JNTUH R25 Mechanical Engineering syllabus PDF
If you are creating this as a paid tuition course, I can next prepare a complete 30–40 hour Thermal Engineering-I teaching plan, unit-wise notes, important JNTUH numerical problems, formulas, and question bank for Tech Talents.
