Performance Analysis of Ramjet Engines

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Presentation transcript:

Performance Analysis of Ramjet Engines P M V Subbarao Professor Mechanical Engineering Department Evaluation of Goodness & Limitations !!!

Creation of Jet with Perfect Gas

Generation of Thrust : The Capacity

Performance Specification - 1 Specific Thrust S

Performance Specification - 2 Thrust Specific Fuel Consumption Propulsive Power or Thrust Power:

Aviation Appreciation Parameter Propulsion Efficiency

Thermodynamic Appreciation Parameter Thermodynamic Efficiency

Overall Appreciation Parameter

Design of Compact Ramjet - 1

Design of Compact Ramjet - 2

Major Losses in Components of a Real Ramjet Loss due to External Shocks Irreversibilities in diffuser section. Mach number change due to combustion. Irreversibilities in CC. Irreversibilities in Thrust Generator.

Closing Remarks on Ramjets Control of high speed Ramjet at off design conditions is very difficult due to occurrence of shocks in Nozzle. Cannot be used for transport of humans and valuables. Poor fuel economy due to low stagnation pressures. An artificial method of enhancing/controlling stagnation pressures at the inlet to thrust generator is essential.

Turbojets: Flexible High Vigor Jets Five basic components: intake: captures air and efficiently delivers it to compressor. compressor: increases air pressure and temperature. combustor: adds kerosene to the air and burns the mixture to increase the temperature and energy levels further. turbine: extracts energy from the gases to drive the compressor via a shaft. nozzle: accelerates the gases further. High levels of engineering required for efficient operation, especially for compressor and turbine - therefore costly compared with ramjet.