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Gasoline compression ignition engines have the great potential for efficient and clean operation. Based on a self-built gasoline-diesel dual fuel engine test bench and an in-cylinder combustion numerical simulation, the effect of fuel stratification, generated by the gasoline dual or single manifold injection strategies and the diesel single or multiple in-cylinder injection strategies respectively, on gasoline compression ignition combustion at low load was studied. The results show that under the low load condition with a speed of 1500r/min and a fuel calorific value of 610.4J/cyc, the concentration stratification degree of the gasoline single port injection strategy is significantly higher than that of the dual ports injection strategy. The strategy of direct injection of micro diesel greatly increases the activity of the mixture, accelerates the generation and consumption rate of active substance. Under the condition of gasoline premix rate as high as 86%, the average indicated pressure and indicated thermal efficiency(ITE) during early injection(-160°CA ATDC) of diesel fuel reach 0.53MPa and 49.41% respectively, and the emission levels of NOx, CO and total hydrocarbons(THC) are reduced, but the pressure rise rate exceeds the limit. By optimization of the gasoline injection strategy and use of the diesel multiple in-cylinder injections, the concentration and activity distribution of the mixture can be flexibly adjusted to delay the heat release process and reduce the pressure rise rate. Under the conditions of the first diesel early injection quantity of 1.9mg/cyc and the secondary diesel direct injection of 1.0mg/cyc, the indicated thermal efficiency is further increased to 49.55%.
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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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