兩缸增壓中冷柴油機排氣壓力波動與影響因素研究
發(fā)布時間：2018-07-31 11:09
【摘要】：兩缸柴油機采用360°CA發(fā)火間隔角,在工作周期中會出現(xiàn)進氣和排氣空檔角,導(dǎo)致進排氣壓力波動較大,引起充量系數(shù)和渦輪效率的下降。針對某兩缸增壓中冷柴油機較大的排氣壓力波動問題,建立了兩缸柴油機整機一維模型與排氣歧管三維模型,應(yīng)用一維與三維耦合模擬計算的方法,對發(fā)動機在不同轉(zhuǎn)速下一個工作循環(huán)的排氣管內(nèi)的氣體流動特性、波動規(guī)律及排氣壓力波動的影響因素進行了分析。研究結(jié)果表明:在全負(fù)荷工況下,發(fā)動機轉(zhuǎn)速從1 000~2 200 r/min時,排氣壓力波動強度由1.82增加到3.56,渦輪效率波動強度由0.12減小到0.02;轉(zhuǎn)速從2 200~4 000 r/min時,排氣壓力波動強度由3.56減小到1.52,渦輪效率波動強度趨于穩(wěn)定狀態(tài)為0.02;排氣總管的長度與直徑、排氣提前角對低轉(zhuǎn)速渦輪效率有顯著影響。
[Abstract]:Two cylinder diesel engine adopts 360 擄CA firing interval angle, and the intake and exhaust gap angle will appear in the working cycle, which leads to large fluctuation of intake and exhaust pressure, resulting in the decrease of charging coefficient and turbine efficiency. Aiming at the large exhaust pressure fluctuation of a two-cylinder turbocharged and intercooled diesel engine, a one-dimensional model and a three-dimensional model of exhaust manifold for a two-cylinder diesel engine are established, and the method of one-dimensional and three-dimensional coupling simulation is applied. In this paper, the gas flow characteristics, fluctuation law and influencing factors of exhaust pressure fluctuation in an exhaust pipe of a working cycle under different engine speeds are analyzed. The results show that under the full load condition, the exhaust pressure fluctuation intensity increases from 1.82 to 3.56, the turbine efficiency fluctuation intensity decreases from 0.12 to 0.02, and the rotational speed changes from 2 200 to 4 000 r/min when the engine speed changes from 1 000 to 2 200 r/min, the exhaust pressure fluctuation intensity increases from 1. 82 to 3. 56, and the turbine efficiency fluctuation intensity decreases from 0. 12 to 0. 02. The fluctuation intensity of exhaust pressure decreases from 3.56 to 1.52and the fluctuation intensity of turbine efficiency tends to be 0.02.The length and diameter of exhaust manifold and the exhaust advance angle have significant effects on the turbine efficiency at low speed.
【作者單位】： 昆明理工大學(xué)云南省內(nèi)燃機重點實驗室;昆明云內(nèi)動力股份有限公司;
【基金】：云南省教育廳重大資助項目(ZD2013007) 國家自然科學(xué)基金資助項目(51466003)
【分類號】：TK42
本文編號：2155397
[Abstract]:Two cylinder diesel engine adopts 360 擄CA firing interval angle, and the intake and exhaust gap angle will appear in the working cycle, which leads to large fluctuation of intake and exhaust pressure, resulting in the decrease of charging coefficient and turbine efficiency. Aiming at the large exhaust pressure fluctuation of a two-cylinder turbocharged and intercooled diesel engine, a one-dimensional model and a three-dimensional model of exhaust manifold for a two-cylinder diesel engine are established, and the method of one-dimensional and three-dimensional coupling simulation is applied. In this paper, the gas flow characteristics, fluctuation law and influencing factors of exhaust pressure fluctuation in an exhaust pipe of a working cycle under different engine speeds are analyzed. The results show that under the full load condition, the exhaust pressure fluctuation intensity increases from 1.82 to 3.56, the turbine efficiency fluctuation intensity decreases from 0.12 to 0.02, and the rotational speed changes from 2 200 to 4 000 r/min when the engine speed changes from 1 000 to 2 200 r/min, the exhaust pressure fluctuation intensity increases from 1. 82 to 3. 56, and the turbine efficiency fluctuation intensity decreases from 0. 12 to 0. 02. The fluctuation intensity of exhaust pressure decreases from 3.56 to 1.52and the fluctuation intensity of turbine efficiency tends to be 0.02.The length and diameter of exhaust manifold and the exhaust advance angle have significant effects on the turbine efficiency at low speed.
【作者單位】： 昆明理工大學(xué)云南省內(nèi)燃機重點實驗室;昆明云內(nèi)動力股份有限公司;
【基金】：云南省教育廳重大資助項目(ZD2013007) 國家自然科學(xué)基金資助項目(51466003)
【分類號】：TK42
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