柴油引擎廣泛地應用於陸上車輛的能源動力源，只須加入燃料油就可以可靠地運轉。如果從排氣除去二氧化碳，並且加入氧再循環，柴油引擎就能形成一個密閉循環系統，並且可當水下載具內一個廉價運轉及高信賴的空氣隔絕動力源(AIP)。因密閉式循環引擎需採用人造大氣，所以進行不同進氣組成對密閉式循環柴油引擎的性能分析是非常重要的。
　　本研究係針對已研發之開式啟動的密閉式循環柴油引擎，改為閉式啟動，以利於水下使用時可隨時順暢地啟動引擎，進行發電的功用。當燃料燃燒時，氧含量一定的情況下，對氬氣和氮氣而言，因氬氣之比熱較氮氣小，則有較大的燃燒速度。在相同引擎轉速下，採用氬氣或氮氣與氧氣搭配，改變負荷和進氣組成分率，進行引擎氣缸內氣體壓力、曲柄角度、耗油量、和排氣溫度等實驗量測，以分析引擎性能參數（如平均有效壓力、制動功率、比油耗及熱釋放率等），以確保密閉式循環柴油引擎系統的性能盡可能提升至一般柴油引擎運轉性能。
　　本研究的成果如下：
1. 成功的將引擎改裝成含有氧氣控制器、氮氣控制器及氬氣控制器，可由個人電腦加以控制進氣組成（氧氣濃度21％，氮氣濃度79％、74%、69%、64%、59%，氬氣濃度0％、5%、10%、15%、20%），並將引擎由以往的開式啟動改由密閉式啟動。
2. 氬氣取代氮氣時，濃度越高則氣缸內燃氣壓力、Smoke與NOX都有增加的趨勢，而引擎制動比燃油消耗率（bsfc）則有下降的趨勢。
3. 因增加KOH水溶液噴灑頭，KOH水溶液濃度15%即可達到良好的CO2吸收效率。

　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%.

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