Analysis of Effect of Artificial Atmosphere on the Performance for a Closed Cycle Diesel Engine

• Main Authors: Wen-Hui Lin, 林文輝
• Other Authors: Hong-Wen Wu
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/00831477603157461313

碩士 === 國立成功大學 === 系統及船舶機電工程學系碩博士班 === 93 === 　A diesel engine can be generally applied to the power source for the vehicle on land, and it only replenishes fuel that can be reliably performed. If we can remove CO2 of the exhaust and replenish O2 to get a closed. It can function as an air independent propulsion(AIP) of low priced and high trusty in the underwater vehicle. The closed cycle engine uses artificial atmosphere, so it is quite important to investigate the engine performance for the CCDE under different inlet gas contents. 　This study is to refit the developed closed cycle diesel engine(CCDE) from opened starting to closed-state starting in order that the engine can be started easily any time when it is available underwater. When fuel burns, with artificial atmosphere for a constant oxygen content, Argon in inlet gas has larger combustion speed than oxygen due to the fact that Argon has a smaller specific heat than oxygen. The experimental measurement as gas pressure in cylinder, crank angle, fuel consumption, and exhaust gas pressure, and so on ，are conducted with various loads and inlet gas contents of argon or nitrogen and oxygen at the same engine speed to analyze the performance parameters (like mean effective pressure, brake power, specific fuel consumption and heat release rate, e.t.c.) for the CCDE, and further to ensure that the operating performance of CCDE can be improved like that of a general diesel engine. 　The main results are as follows: 1. The engine were successfully modified to contain oxygen controller, nitrogen controller, and argon controller. Inlet gas contents (concentrations of oxygen 21％, concentrations of nitrogen 79％, 74%, 69%, 64%, 59%, concentrations of argon 0％, 5%, 10%, 15%, 20%) are controlled by a personal computer, and refit the diesel engine from opened starting to closed-state starting. 2. When argon is substituted for nitrogen, cylinder pressure, Smoke and NOX increase with an increase in the concentration of argon, but specific fuel consumption descends with increasing the concentration of argon. 3. Due to increase the shower nozzle of KOH solution, it can obtain good absorption rate for CO2 with KOH solution 15%.