Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/91306
標題: Investigation on the Effects of Injection Parameter on the Combustion Characteristic and Emissions of Diesel Engine
以共軌系統探討噴油參數對柴油引擎的燃燒特性及排放汙染之影響
作者: 林九洲
Chiu-Chou Lin
關鍵字: Diesel Engine
Common rail System
Injection Timing
Injection Pressure
Multiple Injection
柴油引擎
共軌噴射系統
噴油正時
噴油壓力
多段噴油
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摘要: This research establish the common rail system in the sixth cylinder of the diesel engine, it means to move out the original fueling system from the sixth cylinder, and use the independent motor to connect common rail and injector. In this system, the injection signal control module made from 8051 chip is used to control the injection signal. This research also isolates the intake manifold and exhaust manifold of the sixth cylinder to analyze the emissions. This research is to investigate about combustion characteristic and pollution emission by keeping the engine speed at 1650 rpm and adjusting injection timing, injection pressure, injection fuel quantity and multiple injection strategy. The results show that advancing the injection timing and increasing the injection pressure can increase the maximum cylinder pressure, maximum cylinder pressure raising rate and NOX, but the CO and opacity will decrease. Furthermore, higher injection pressure can also reduce the ignition delay so that the CA50 and the start of the heat release occur earlier. Comparing to single injection, using pre injection can increase the IMEP and let the CA50 occur earlier by 1~2° crank angle. The short pre injection can reduce the ignition delay by 1~2° crank angle. However, the opacity increase by 8% and NOX increase by 23.1%. On the other hand, using post injection results in lower thermal efficiency and maximum cylinder pressure and delays the CA50 1~2° crank angle. In addition, post injection not only reduces the opacity by 11.56% but also decreases NOX by 30.6%. Final, using three stage injections causes the thermal efficiency and maximum cylinder pressure lower but reduces the opacity by 3.08%.
本研究以一具六缸柴油引擎為基礎建立一套共軌噴射系統,將第六缸原有的噴射系統移除,改由外部馬達帶動高壓油泵,連接至共軌管及共軌式噴嘴,噴油訊號則是以8051單晶片建立的噴油訊號控制模組進行控制,另將第六缸的進、排氣岐管分離,分析第六缸的汙染物排放。本研究將引擎轉速固定為1650rpm,改變噴油正時、噴油壓力及噴油量探討噴油參數對燃燒特性、污染物排放的影響,而在多段噴射的部分則是固定主噴射的角度,改變預噴射及後噴射的噴油角度、噴油脈寬,探討不同多段噴射策略對引擎的影響。 結果顯示提前噴油正時與提高噴油壓力會使最大汽缸壓力、最大汽缸壓力上升率及氮氧化物濃度增加,而一氧化碳和不透光率則是會下降,並且較高的噴油壓力也能縮短點火延遲,使CA50及開始熱釋放的角度提前;而在兩段噴射方面,與單次噴射相比,使用預噴射後會提高指示平均有效壓力,提高燃燒循環變異量至4%,CA50提前1至2度,其中,使用短脈寬的預噴射會縮短點火延遲1至2度,然而不透光率會增加8%,氮氧化物濃度增加23.1%,而使用後噴射則是會使指示熱效率及最大汽缸壓力降低,增加燃燒循環變異至4%以上,CA50延遲1至2度,此外,後噴射不僅能降低不透光率11.56%,還能減少氮氧化物濃度約30.6%;最後,使用了三段噴射後則是會使指示熱效率、最大汽缸壓力、最大汽缸壓力上升率下降,指示平均有效壓力則是輕微上升,不透光率降低了3.08%。
URI: http://hdl.handle.net/11455/91306
文章公開時間: 2018-08-20
Appears in Collections:機械工程學系所

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