Module Details

The information contained in this module specification was correct at the time of publication but may be subject to change, either during the session because of unforeseen circumstances, or following review of the module at the end of the session. Queries about the module should be directed to the member of staff with responsibility for the module.
Title IC ENGINES
Code MECH428
Coordinator Prof RJ Poole
Mechanical, Materials & Aerospace Eng
Robpoole@liverpool.ac.uk
Year CATS Level Semester CATS Value
Session 2020-21 Level 7 FHEQ First Semester 7.5

Aims

To provide an introduction to the different types of Internal Combustion (IC) engines.

To present the engineering science background behind the operation of IC engines.

To present the principles to assess the performance of an IC engine.

To present the thermodynamic and fluid-mechanical analysis of different processes involved in IC engines.


Learning Outcomes

(S1) On successful completion of the module, students should be able to show experience and enhancement of the following key skills: Problem-definition and mathematical modelling evaluating alternative problem-solution procedures

(S2) There is no laboratory element for this module.

(S3) On successful completion of the module the students should be able to demonstrate ability in applying the above knowledge to: Analyse thermodynamic cycle analysis for IC engines Assess the performance of IC engines Analyse the flow characteristics in intake and exhaust manifolds Analyse combustion process within the cylinder of an IC engine.

(S4) On successful completion of the module the students should be able to demonstrate knowledge and understanding of: Thermodynamic analysis of IC engine cycles Assessment of energy conversion in IC engines Fluid-dynamical issues related to suction and exhaust and combustible mixture distribution Combustion process and its analysis in IC engines


Syllabus

 

1. Introduction to IC Engines Introduction to IC Engines Different types of engines Difference between SI and CI engines Difference between 2 stroke and 4 stroke engines. Naturally aspirated engine, Turbo-charged engines. Direct Injection (DI) engines, Homogeneous Charge Compression Ignition (HCCI) engines.

2. Chemical Thermodynamics Introduction to the terms: stoichiometry, equivalence ratio, air-fuel ratio. Enthalpy of formation Chemical equilibrium and dissociation. Evaluation of adiabatic flame temperature. Higher heating value and lower heating value.

3. Thermodynamic cycle analysis of engines Air-standard cycle: i) Assumptions, ii) Otto cycle, iii) Diesel cycle, iv) Incomplete diesel cycle, v) Effects of compression ratio on thermal efficiency, vi) Effects of fuel cut-off ratio on thermal efficiency. Fuel-air cycles: i) Assumptions, ii) Effects of variable specific heat, chemical reaction, chemical dissociation, and of heat transfer on thermal efficiency. Differenc e between air-standard and fuel-air cycle base analysis.

4. Efficiencies and Performance markers Volumetric efficiency Indicated and Brake efficiency Indicated and Brake power Mean Effective Pressure (MEP): Indicated MEP and Brake MEP Specific Fuel Consumption (sfc): Indicated sfc (isfc) and Brake sfc (bsfc) Performance curves

5. Gas-Exchange Processes and Fuel distribution Homogeneous charge preparation: Intake/Exhaust manifold gas dynamics Valve timings in SI/CI engines Fuel distribution in multi-cylinder CI engines, Fuel pump Different types of fuel nozzles, Different type of cylinder designs for CI engines: direct injection and indirect injection systems. Homogeneous charge compression ignition and lean-burn engines. Exhaust Gas Recirculation (EGR)

6. Combustion process Principles of combustion in SI engines Spark Ignition system in SI engines Irregular combustion: Auto-ignition, Knock in SI engines. Octane number Principles of combustion in CI engines Knock in CI engines Cetane number Flash point and flame point


Teaching and Learning Strategies

Teaching Method 1 - Lecture Description: Teaching Method 2 - Tutorial Description:


Teaching Schedule

  Lectures Seminars Tutorials Lab Practicals Fieldwork Placement Other TOTAL
Study Hours 18

  6

      24
Timetable (if known)              
Private Study 51
TOTAL HOURS 75

Assessment

EXAM Duration Timing
(Semester)
% of
final
mark
Resit/resubmission
opportunity
Penalty for late
submission
Notes
Assessment 1 Assessment Schedule (When) :End of 1st semester  2 hours    100       
CONTINUOUS Duration Timing
(Semester)
% of
final
mark
Resit/resubmission
opportunity
Penalty for late
submission
Notes
             

Recommended Texts

Reading lists are managed at readinglists.liverpool.ac.uk. Click here to access the reading lists for this module.