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Effect of Variable Exit Area Exhaust Nozzle on the Turbojet Engine Performance

This is a thesis Submitted in Partial Fulfillment of the Requirements for the Degree of Master of Science (M.Sc.) in Mechanical Power Engineering.

The exhaust nozzle of a turbojet engine is one of the main components which affects its performance significantly. Several researches have been done to study the performance of these engines and their deviation at different exhaust nozzle designs.
Most of the previous work were concerned with large turbojet engines. But lately, a huge development in micro turbojet engines was achieved.
In this study, an analytical model is created to predict the performance of a micro turbojet engine and the impact of its exit area variation on the generated thrust and fuel consumption. The model is based on empirical formulas used previously with large scale engines.
The model is verified using experimental data captured from the engine during an equilibrium run at different speeds, starting from the idle value (33,000 rpm), till reaching its maximum rated speed (112,000 rpm).
A complete flow analysis through the nozzle is performed using a computational fluid dynamics (CFD) software "ANSYS CFX 16.0". A good agreement is reached between the CFD and model results concerning the nozzle characteristics curve.

The thesis consists of eight chapters, which are outlined as following.
Chapter (1)
Introduces the thesis subject.
Chapter (2)
Introduces an intensive literature review of different previous approaches, which were done to study the performance of micro turbojet engines.
Chapter (3)
Presents the analytical model and the calculation procedure which is used to simulate the engine performance and determine the engine equilibrium run lines, while using different exhaust nozzle designs.
Chapter (4)
Presents the CFD model, which is used to simulate the flow field through the exhaust nozzle, using ANSYS CFX 16.0.
‎Chapter (5)
Illustrates the test-bed setup, which is used to study the JetCAT P200-SX engine's performance experimentally.
‎Chapter (6)
Gathers all the evaluated and measured data for analysis and comparison.
‎Chapter (7)
Presents the built engine control circuit and discusses its startup and operation sequence.
‎Chapter (8)
Presents the conclusions of the thesis and the expected future work

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