Tham khảo tài liệu 'turbo machinery dynamics part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | __CHAPTER 4__ DERIVATIVE ENGINES FOR MARINE AND INDUSTRIAL USE INTRODUCTION There are a number of industrial situations where the lightweight characteristics of an aircraft engine can be advantageously applied to generate mechanical power. The power however is mostly for driving other machines instead of developing aerodynamic thrust. Hence the fan is no longer needed and the developed mechanical power drives an electric generator a compressor or a ship s propellers. Derivative engines based on aircraft engine technology have been developed expressly for such a situation for producing mechanical energy. Electrical power generation on an offshore oil platform is a good example. A tremendous amount of mechanical energy is required to operate drills pumps compressors and rigs on exploratory and production oil platforms. The geometry of a typical rig calls for a platform weighing several hundred thousand pounds located 50 to 100 ft above the surface of the water with the superstructure supported by four legs resting at the bottom of the sea. Strictly from stability considerations it is of vital importance to limit the weight of the overall structure above the water line as well as that of the individual components located on the platform. The weight of a typical industrial gas turbine is prohibitively large and hence a design derived from aircraft engine technology would be ideal. Pipeline pumping and gas compression applications also require a large operating speed range as opposed to a fixed speed requirement of a power-generation gas turbine. Add to that the capability of a combustion system to burn liquid or gas fuels that are abundantly available on an oil platform and the suitability of a derivative engine becomes readily apparent. Shipboard prime movers and many other marine applications have similar weight restrictions. Low-speed reciprocating diesel engines have been traditionally employed for marine propulsion but the engines tend to be physically .
