纪少波,季魁玉,程勇,刘宝同,李新海.喷射持续期对大功率气体机影响规律分析[J].农业机械学报,2016,47(1):344-348.
Ji Shaobo,Ji Kuiyu,Cheng Yong,Liu Baotong,Li Xinhai.Influence of Injection Duration on High Power Multi\|injection Gas Engine[J].Transactions of the Chinese Society for Agricultural Machinery,2016,47(1):344-348.
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喷射持续期对大功率气体机影响规律分析   [下载全文]
Influence of Injection Duration on High Power Multi\|injection Gas Engine   [Download Pdf][in English]
投稿时间:2015-06-12  
DOI:10.6041/j.issn.1000-1298.2016.01.047
中文关键词:  大功率气体机  多点喷射  喷射持续期  混合气形成  燃烧性能
基金项目:山东省自然科学基金项目(2013ZRE27215)和中国博士后基金项目(2015M572029)
作者单位
纪少波 山东大学 
季魁玉 胜利油田胜利动力机械集团有限公司 
程勇 山东大学 
刘宝同 山东大学 
李新海 山东大学 
中文摘要:研究了大功率气体机采用进气道多点顺序喷射方式时,喷射持续期对缸内混合气形成及燃烧性能的影响规律。通过数值解析的方法研究了采用单管结构及双管结构进气对混合气形成过程的影响,在此基础上确定了采用双管结构喷射燃气。在发动机标定工况,保证其它条件一致的条件下,通过数值解析及燃烧测试分析的方法对比了5种不同喷射持续期对缸内混合气形成及循环变动率的影响规律。这5种喷射持续期的喷射起始时刻均为进气上止点后40°,此时排气门接近全关,不存在燃气直接进入排气管的情况;另外活塞运动速度快,进气具有较强的扰动能量,有助于促进燃气与空气的混合。数值解析及实验测试结果表明,对于研究用发动机在实验工况下,当喷射持续期从5ms增加到10ms时,由于能够充分利用进气扰动的能量改善混合气的形成,有效降低了循环变动率;随着喷射持续期的继续增加,当喷射持续期为12ms或15ms时,后期喷射的燃气由于此时进气流速降低无法进入缸内,部分燃气滞留进气道,减少了可燃混合气的燃气,形成的混合气偏稀,反而不利于缸内燃烧过程的进行。
Ji Shaobo  Ji Kuiyu  Cheng Yong  Liu Baotong  Li Xinhai
Shandong University,Shengli Oilfield Shengli Power Machinery Group Co., Ltd.,Shandong University,Shandong University and Shandong University
Key Words:high power gas engine  multi injection  injection duration  mixture formation  combustion performance
Abstract:The influence of injection duration on the mixture formation and combustion performance of high power multi\|injection gas engine was studied. CFD simulation was employed to study the different effects on the mixture formation by adopting the structures of single elbow and twin elbows individually. On the basis of the result, the twin elbows structure was determined to be used in the experiment. And five different periods of injection duration were particularly designed. CFD simulation and combustion analysis were employed to explore the influence of different injection durations on mixture formation and combustion performance under the conditions of engine working in rated power while other parameters remaining unchanged. In the experiment, the beginning time of each injection duration period was at 40° after inlet TDC. In this situation the exhaust valve was fully closed, natural gas couldn’t directly enter the valve. Moreover, with the quick movement of piston, the injection gas has strong disturbance energy. These all help to promote the combination of natural gas and air. The results of CFD simulation and experiment indicated that under the experimental conditions, when the injection duration extended from 5ms to 10ms, the cycle variation of combustion of the studied engine decreased obviously. That’s because the extended time could guarantee the disturbance energy which was produced by injection gas being fully used, therefore, the mixture formation quality was improved correspondingly. However, when the injection duration was prolonged to 12ms or 15ms, the flow rate of natural gas would be decreased and the injection gas couldn’t enter the cylinder. Thus part of natural gas still stayed in the elbow, which reduced the quantity of the gas that can effectively develop the mixture and make the mixture thinner, which was unfavorable for the combustion.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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