الفهرس 
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Abstract
The present work is one of the research projects included in the studies list for the Egyptian Naval Forces Research and Development Center (R&D). The present thesis discusses the use of high pressure fogging system for inlet air cooling aiming to enhance marine gas turbine engine performance onboard naval ships. A case study was conducted to figure out the applicability and the economical beneficial of the proposed system.
In chapter one: A review of different types of gas turbine engi~es was introduced.
Also, the advancement programs used for their enhancement to reach tHose levels of diesel engines counterparts were demonstrated as well.
In chapter two: Different techniques used to enhance gas turbine engines were
summarized and classified into three main categories:
1. Pre-combustion techniques.
2. In-combustion techniques.
3. Post-combustion techniques.
Pre-combustion techniques used for electric power generation and industry were reviewed and evaluated in the form of weight matrix. The weight matrix reveled that fogging system is the most suitable system for marine use due to its obvious advantages over other alternatives.
In chapter three: A model was constructed to simulate a marine gas turbine engine in simple cycle configuration using Engineering Equation Solver (EES) software package. The engine selected for the study is GE-LM2500. The model was verified and found a maximum difference of 0.4% between model and catalogue data. A Parametric study was done and showed that the ambient air temperature was the most effective factor on engine performance. An Increase of 1°C in ambient temperature decreases engine power by 0.22%.
In chapter four: The fogging system was assessed to evaluate its adaptability onboard ships. A detailed description of the system and installation requirements was discussed and finally, the proposed fogging system was designed in engine inlet duct to be applied for surface ships through a case study.
In chapter five: Another model representing the proposed fogging system was designed. The model showed the required water flow rate, nozzle diameter, evaporation time and cooling efficiency.
In chapter six: Evaluation of the proposed fogging system on engine performan6e parameters was done by comparing engine parameters before and after using the fogging technique. A significant increase in engine power and thermal efficiency by an ave~age of 19% and 1.5% respectively were achieved. The Payback period of such system were found to be 26 months.
In chapter seven: Conclusions and recommendations of all present work were covered.