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The compression pressure and temperature during low-temperature start was analyzed on a V-type 8-cylinder turbocharged diesel engine，and then the ignition characteristics of diesel spray was studied in a constant-volume spray combustion test device with background temperature and density based on the low-temperature start condition of the engine. The relationship between ignition delay period and ignition position under different background temperature and density conditions was studied. It is found that the ignition delay of diesel free spray increases and the ignition stability decreases with the decrease of background temperature. When the background temperature is below 430℃，the success rate of diesel jet ignition is very low，leading to misfire. The research result is of great significance for improving the stability of low-temperature start and improving fuel consumption and emissions for the diesel engine.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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