| 王聪,潘蓓蓓,邬斌扬,等.柴油引燃天然气发动机中高负荷性能优化试验研究[J].内燃机工程,2023,44(6):38-45. |
| 柴油引燃天然气发动机中高负荷性能优化试验研究 |
| Experimental Study on the Performance Optimization of A Diesel Pilot Ignited Natural Gas Engine Under Medium and High Loads |
| DOI：10.13949/j.cnki.nrjgc.2023.06.005 |
| 关键词:柴油引燃天然气 多参数 热效率 最小引燃油量 |
| Key Words:diesel pilot ignited natural gas multi-parameter thermal efficiency minimum diesel mass |
| 基金项目:国家重点研发计划项目（2022YFE0100100）；天津市自然科学基金项目（19JCYBJC21200） |
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| 摘要:基于潍柴WP10H改造的单缸机试验平台，深入研究中、高负荷工况充量热力学参数和柴油喷射参数之间的耦合关系及多参数协同获得高热效率的控制方法。结果表明，在平均指示压力（indicated mean effective pressure， IMEP）为1.0 MPa的中负荷工况，提前喷油定时会减少引燃油量的需求量；随着预混天然气当量比增大，柴油喷射定时推迟且喷油定时对引燃油量变化的敏感性降低，指示热效率（indicated thermal efficiency， ITE）和燃烧速率趋于最大值时所需要的最小引燃油量减小；中高负荷工况（IMEP为1.4 MPa）下，增大废气再循环（exhaust gas recirculation， EGR）率需提前喷油定时，增加引燃油量；增压会带来当量比减小从而减缓燃烧速率和提高压缩温度利于快速压燃着火两方面的影响，综合作用取决于混合气自身的热力学氛围。在中负荷工况下，柴油喷射参数的控制需要尽可能地提升燃烧速率以降低燃烧损失，而通过优化当量比调控传热损失与排气损失是提升热效率的关键；在满足粗暴燃烧限值的同时，优化燃烧相位避免过高的排气损失是中高负荷工况提高热效率的关键；随着负荷升高，进气压力与EGR率均增大，最小引燃油量减小，IMEP为1.7 MPa时，ITE可提升至52.1%，最小柴油能量占比为4.7%。 |
| Abstract:Based on the single-cylinder engine test platform modified by Weichai WP10H， the coupling relationship between thermodynamic parameters and diesel injection parameters under medium and high load operating conditions and the control method to obtain high thermal efficiency were studied in depth. The results show that under medium load conditions that the indicated mean effective pressure（IMEP） is 1.0 MPa， the diesel injection timing is advanced to reduce the diesel mass. And with the increase of premixed natural gas equivalent ratio， the diesel injection timing is delayed and its sensitivity to the variation of diesel mass is reduced. In addition， the minimum diesel mass corresponding to the indicated thermal efficiency and combustion rate approximating the maximum value is decreased. Research shows that the increase in exhaust gas recirculation（EGR） rate will not only advance the diesel injection timing， but also make the diesel mass increase with IMEP=1.4 MPa. And the boost will cause two effects. One is to reduce the equivalent ratio to slow down the combustion rate， and the other is to increase the compression temperature， which is conducive to achieving rapid compression ignition. The combined effect depends on the thermodynamic atmosphere of the mixture itself. Under medium load conditions， the control of diesel injection parameters need to enhance the combustion rate as much as possible to reduce combustion losses， and the existence of the best equivalent ratio can regulate the combustion phase， thus achieving the energy balance between heat transfer and exhaust losses， which is the key to optimizing thermal efficiency. Besides， in the case of meeting the ring index limit， the combustion phase is optimized to avoid excessive exhaust losses， which is the key to improving thermal efficiency under medium and high load conditions. The results show that as the load increases， the optimized performance corresponding intake pressure and EGR rate boundary conditions both increases and the minimum diesel mass decreases. In particular， the indicated thermal efficiency can be increased to 52.1% at indicated mean effective pressure of 1.7 MPa， and the minimum diesel energy ratio is 4.7%. |
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