Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4768603 | Fuel | 2017 | 10 Pages |
Abstract
The experiments on the ignition and combustion characteristics of diesel in air atmosphere (AA) and premixed methanol/air mixture atmosphere (MAA) were conducted in a constant volume combustion chamber (CVCC) equipped with a high pressure common-rail injection system. The ignition and combustion processes were recorded by a high-speed camera and a combustion pressure acquisition system. Results show that with the increase of injection pressure from 40 to 160Â MPa, the flame lift-off length (FLoL) becomes longer; and the ignition delay is shortened from 2.80Â ms to 2.03Â ms (AA) and 2.90Â ms to 2.27Â ms (MAA) respectively; and correspondingly the combustion duration is shortened from 5.17Â ms to 2.47Â ms (AA) and 4.83Â ms to 2.13Â ms (MAA). Compared those in AA, the ignition delay is prolonged by 0.14Â ms on average, while the combustion duration is shortened by 0.27Â ms in MAA. At high injection pressure, the moments that the maximum combustion pressure occurs and the apparent heat release rates (AHRR) starts to rise are advanced; while in MAA both of them are delayed; and the peak value of AHRR increases. With the increase of injection pressure, both spatially integrated natural luminosity (SINL) and time integrated natural luminosity (TINL) reduce significantly, but the reduction trends of TINL weaken. Due to the addition of methanol, the FLoL of diesel becomes longer, and the SINL and TINL in MAA are both lower than those in AA.
Keywords
CNGDAQSMDDMDFMAACVCCAHRRDMESauter mean diameterData acquisitionparticulate numberAir atmosphereDieselDimethyl etherparticulate matterapparent heat release ratediesel/methanol dual fuelSOCStart of combustionFlame lift-off lengthInjection pressureMethanolconstant volume combustion chamberIgnition characteristicscompressed natural gas
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Chunde Yao, Jiangtao Hu, Peilin Geng, Junjie Shi, Defu Zhang, Yusheng Ju,