首页> 外文会议>JSAE/SAE International Powertrains, Fuels Lubricants Meeting >Impact of Effective Compression Ratio on Gasoline-Diesel Dual-Fuel Combustion in a Heavy-Duty Engine Using Variable Valve Actuation
【24h】

Impact of Effective Compression Ratio on Gasoline-Diesel Dual-Fuel Combustion in a Heavy-Duty Engine Using Variable Valve Actuation

机译:使用可变阀致动的重型发动机中有效压缩比对汽油 - 柴油双燃料燃烧的影响

获取原文

摘要

Dual-fuel combustion using port-injected gasoline with a direct diesel injection has been shown to achieve low-temperature combustion with moderate peak pressure rise rates, low engine-out soot and NO_x emissions, and high indicated thermal efficiency. A key requirement for extending high-load operation is moderating the reactivity of the premixed charge prior to the diesel injection. Reducing compression ratio, in conjunction with a higher expansion ratio using alternative valve timings, decreases compressed charge reactivity while maintain a high expansion ratio for maximum work extraction. Experimental testing was conducted on a 13L multi-cylinder heavy-duty diesel engine modified to operate dual-fuel combustion with port gasoline injection to supplement the direct diesel injection. The engine employs intake variable valve actuation (VVA) for early (EIVC) or late (LIVC) intake valve closing to yield reduced effective compression ratio. Testing was conducted at a mid-load operating condition using a gasoline-diesel dual-fuel operating strategy. The impact on dual-fuel engine performance and emissions with respect to varying effective compression ratio is quantified within this study. As effective compression ratio is reduced, overall massflow through the engine decreases, yielding both higher gas exchange efficiencies and increased heat transfer losses. With constant combustion phasing gasoline/diesel fueling fraction, and NO_x emissions held constant, overall brake thermal efficiency remains relatively constant across effective compression ratios.
机译:已经显示使用具有直接柴油注入的端口注射汽油的双燃料燃烧,以实现低温燃烧,以适度的峰值压力升高,低发动机烟灰和NO_X排放以及高指示的热效率。延长高负荷操作的关键要求是在柴油喷射之前采用预混合电荷的反应性。减小压缩比与使用替代气门定时的更高的膨胀比,降低压缩电荷反应性,同时保持高膨胀比以获得最大的工作提取。在13L多缸重型柴油发动机上进行了实验测试,该发动机与端口汽油喷射进行双燃料燃烧,以补充直接柴油注射。该发动机采用进气可变阀致动(VVA),用于早期(EIVC)或晚期(LIVC)进气门关闭,以产生降低的有效压缩比。使用汽油 - 柴油双燃料操作策略在中负载操作条件下进行测试。在本研究中量化了对不同有效压缩比的对双燃料发动机性能和排放的影响。随着有效的压缩比减小,通过发动机的整体质量流量降低,产生较高的气体交换效率和增加的传热损失。通过恒定的燃烧相位汽油/柴油燃料级分,并且NO_X排放保持恒定,在有效的压缩比中,整体制动热效率仍然相对恒定。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号