الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
This study was directed towards a deep understanding of
the unsteady fluid flow ejector. A pulsejet ejector was designed, built, tested and analysed theoretically. The experimental device was designed as flexible as possible to permit variation of the geometric and non-geometric parameters.
The study showed that the intermittent primary jet has a ”Piston like” action as it enters, and moves along the augmenter duct, thereby verifying the essentially pressure exchange process within the device. This led to the deduction that primary flow characteristics, were of paramount significance in determining the pulsejet ejector performance. A primary slug combining high momentum with a short duration was always desirable for better ejector performance. It also led to the insignificance of the mixing between the primary and the secondary flows without viscosity playing a dominant role as in steady flow counterpart.
The theoretical study, consisted of the solution of the hyperbolic partial differential equations, controlling the un¬steady flow within the primary tube. The graphical method proved to be extremely slow for this task. The computerised finite difference procedure based on Hartree proved to be an adequate design tool.
The experimental study, was performed to obtain results for comparison with the theoretical predictions, as well as, for optimization of the pertinent geometric and non-geometric parameters influencing the pulsejet ejector performance.
Good agreement, was obtained between the theoretical and the experimental results, justifying the theoretical model, hence, the numerical solution procedure.
The theoretical results showed the effect, on the primary flow performance of some of the pertinent parameters.
By increasing the primary to the secondary stagnation pressure ratio from 1.25 up to 3.5 , the primary flow perform¬ance level was increased to about seven times, and a very small improvement was predicted for further increase of the stagnation pressure ratio.