本文選題：閉式循環(huán)　切入點：定容燃燒彈　出處：《北京建筑大學(xué)》2016年碩士論文

【摘要】：為了有效降低柴油機的排放污染物以滿足其在特殊環(huán)境中的使用要求,提出了一種液氧固碳閉式循環(huán)柴油機。該類閉式循環(huán)柴油機擁有良好的應(yīng)用前景,但是前期的研究工作主要集中在臺架性能測試方面,對于柴油在這種新式循環(huán)背景下的著火化學(xué)反應(yīng)機理方面的研究比較欠缺,因此急需在著火燃燒方面的進行深入研究。利用流體動力學(xué)計算軟件KIVA-3V建立了以Sandia定容燃燒彈為原型的計算網(wǎng)格,仿真了柴油在O_2/CO_2背景氣體下的燃燒特性,并利用色溫法對比了仿真結(jié)果與試驗結(jié)果,驗證了計算模型的準確性。利用了定容燃燒彈測試平臺對試驗過程進行了可視化研究,試驗分工況研究了不同進氣成分背景條件下對柴油噴霧以及著火燃燒特性的影響規(guī)律。應(yīng)用CCD高速攝影機對試驗過程及結(jié)果進行了記錄。最后對不同燃燒階段所得數(shù)據(jù)進行了相關(guān)分析,得出結(jié)論。研究發(fā)現(xiàn),背景氣體成分的變化會引起其密度的變化;背景氣體為空氣時密度最低,當成分變?yōu)?0%氧氣與50%二氧化碳混合時密度最高。背景氣體的密度會對燃油液相噴霧的貫穿距離產(chǎn)生較大影響,但對其液相錐角的影響不大。其次,隨著進氣成分中氧濃度的升高,二氧化碳量的下降,滯燃期迅速縮短,著火點位置離噴油孔的距離逐漸減小。
[Abstract]:In order to effectively reduce the emission of pollutants from diesel engine to meet the requirements of its application in special environment, a liquid-oxygen solid carbon closed cycle diesel engine is proposed. This type of closed cycle diesel engine has a good application prospect. However, the previous research work is mainly focused on the bench performance test, and the research on the ignition chemical reaction mechanism of diesel oil under this new cycle background is relatively lacking. Therefore, it is urgent to make a deep research on ignition combustion. Using the hydrodynamic calculation software KIVA-3V, a computational grid based on Sandia constant volume combustor is established, and the combustion characteristics of diesel oil under the background gas of O_2/CO_2 are simulated. The accuracy of the calculation model is verified by comparing the simulation results with the experimental results by using the color temperature method, and the visual research on the test process is carried out by using the constant volume combustion bomb test platform. The effects of different inlet air components on diesel spray and ignition characteristics were studied in different operating conditions. The experimental process and results were recorded by using CCD high speed camera. Finally, different combustion stages were studied. The data were analyzed. Conclusion. The study found that changes in the composition of background gases cause changes in their density; when background gases are air, the density is the lowest, When the composition is mixed with 50% oxygen and 50% carbon dioxide, the density of the background gas will have a great effect on the penetration distance of the fuel liquid spray, but not on the liquid cone angle. With the increase of oxygen concentration, the amount of carbon dioxide decreases, the ignition delay period shortens rapidly, and the distance from the injection hole decreases gradually.
【學(xué)位授予單位】：北京建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TK421.2

【相似文獻】

相關(guān)期刊論文 前10條

1 趙維;;固體可燃物在輻射條件下著火特性的分析[J];價值工程;2013年10期

2 孫恩召,李炳熙,于洪彬,吳少華,秦裕琨;關(guān)于煤的著火特性的系數(shù)[J];熱能動力工程;1991年06期

3 王春林,楊建國,翁善勇,周永剛,胡宏偉,周坤,趙虹;我國主要動力用煤的著火特性試驗及分析[J];鍋爐技術(shù);2004年06期

4 官學(xué)貴;;煤粉著火特性評判指標與煤燃燒動力學(xué)參數(shù)研究[J];科技信息;2011年29期

5 欒積毅,武雪梅;煤著火特性的實驗研究[J];佳木斯大學(xué)學(xué)報(自然科學(xué)版);2003年02期

6 胡文斌,楊海瑞,呂俊復(fù),岳光溪,張建勝;煤著火特性的熱重分析研究[J];電站系統(tǒng)工程;2005年02期

7 傅維標,張恩仲;煤焦非均相著火溫度與煤種的通用關(guān)系及判別煤焦著火特性的通用指標[J];電站系統(tǒng)工程;1993年04期

8 王春波;王金星;雷鳴;;煤粉與生物質(zhì)混燃的低溫著火特性[J];動力工程學(xué)報;2013年03期

9 張忠孝;煤粉氣流著火特性試驗研究[J];電站系統(tǒng)工程;1991年04期

10 常愛英;吳鐵軍;包鑫;;最小二乘支持向量機在煤著火特性研究中的應(yīng)用[J];動力工程學(xué)報;2010年12期

相關(guān)會議論文 前1條

1 紀Z孼，

本文編號：1653068