Aircraft Propulsion

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2221171 Z,ZK 4 3P+1C Czech
Jan Klesa
Martin Helmich
Department of Aerospace Engineering

Theoretical background. Gravitation field and atmosphere. Classification of aircraft engines, characteristics, domains of use, comparative parameters, characteristics and criteria. Energy intensity of the aircraft propulsion, accumulation ant transformation of energy. Thermal cycles analysis, working substances, environmental constraints, efficiencies. Aircraft engines with periodic thermal cycles ? reciprocating engines, pulsating ram engines. Engines with external heat supply ? Stirling engine. Aircraft engines with continuous thermal cycles ? turbojet engines, ram engines, rocket engines and combined Turbojet-RAM engines. Modes of aircraft engines control and thrust control.

Benchmark thermal cycles calculations and aircraft engines performance characteristics.


Fluid Dynamics A, Thermodynamics A

Syllabus of lectures:

1. Historical overview, forces acting on the aircraft, needed thrust and power, propulsive efficiency

2. Aircraft propulsion systems, thrust and mechanical power of a propulsion system

3. Propeller, introduction to propeller aerodynamics, thrust, power, internal and external efficiency, non dimensional coefficients

4. Fundamentals of applied thermodynamics and aerodynamics of thermal cycles of piston and turbine engines

5. Aircraft piston engines, basic classification, function, characteristics

6. Turbine engines, thermal cycles and their properties, power and thermal efficiency

7. Fundamentals of internal aerodynamics and thermodynamics of flow machines

8. Compressors and turbines, construction concepts and characteristics

9. Inlets and nozzles and their characteristics

10. Combustion, combustion chambers and their operating characteristics

11. Turbojet, bypass, turboprop and turboshaft engines, construction schemes, operating characteristics

12. External operating characteristics of aircraft engines

13. Noise and emissions of aircraft engines

Syllabus of tutorials:

1. Calculation of a content of oxygen in Earths atmosphere, theoretical quantity of carbon and hydrogen reserves accumulated by the photosynthesis

2. Calculation of needed power of an aircraft power unit as a function of a mass and wing area of the aircraft and its aerodynamic characteristics and speed of flight

3. Calculation of a needed thrust curve as a function of the speed of flight for given aircraft and its aerodynamic characteristics

4. Calculations of basic changes of the thermodynamic state of an ideal gas and respective induced or leaded out work and heat

5. Calculation of useful power of a piston engine and of its specific fuel consumption

6. Analysis of a Brighton Cycle power characteristics

7. One dimensional internal flow within channel of a variable cross-section, total and static thermodynamic state, Mach, Laval and Reynolds numbers

8. Calculation of work of an elementary axial flow compressor and axial flow turbine stages

9. Calculations of the gas mass flow through convergent and convergent-divergent nozzles

10. Calculation of chemical reactions between basic elements of air and fuels and determination of theoretical mixing ratio of air and fuel

11. Calculation of useful power, thrust and thermo-propulsive efficiency of turbine propulsion unit

12. Calculations of thermal cycles of turbojet engines and ram engines

13. Determination of stabilized working regimes of a turbojet engine and its theoretical operational speed characteristic

Study Objective:

Make clear of principles of aircraft propulsion from the point of view of a thrust production and energy intensity needed for its provision.

Make clear of principles of aircraft engines functioning focused both on engines with periodic and continuous thermal cycles and familiarize students with their construction schemes and operational characteristics.

Make clear of a process of energy transformations within aircraft propulsion units and their internal (combustion and thermal) and external (propulsive) efficiencies.

Make clear of operational characteristics of aircraft propulsion units, throttle characteristics, speed-power and speed ? thrust characteristics, altitudinal ? power and altitudinal ? thrust characteristics.

Familiarize students with importance of the aircraft propulsion disturbance on environment, particularly noise and pollutant emissions generated by engines and ways and measures of their reduction.

Study materials:

-Anderson, Jr., J., D.: Introduction to FlightMcGraw-Hill Higher Education, 2000

-McCormick B., W.: Aerodynamics, Aeronautics and Flight Mechanics, John Wiley nad sons, INC., 1995

-Wegener P., P.: What Makes Aeroplanes Fly?, Springer, 1997

Time-table for winter semester 2020/2021:
Klesa J.
(lecture parallel1)
Karlovo nám.
Učebna KA210 12122
Helmich M.

(parallel nr.1)
Karlovo nám.
Učebna KA210 12122
Helmich M.

(parallel nr.2)
Karlovo nám.
Učebna KA210 12122
Time-table for summer semester 2020/2021:
Time-table is not available yet
The course is a part of the following study plans:
Data valid to 2020-09-19
For updated information see http://bilakniha.cvut.cz/en/predmet4877506.html