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Outline
In order to solve the cold start difficulty for diesel engines on the plateau, an experimental study on the effect of flame intake preheating on the starting performance of diesel engine at 5km altitude was carried out on a plateau environmental test chamber. The results show that under the altitude of 5km and the intake temperature of 303K without intake preheating, the diesel engine falters in the speed range of 400—500r/min at the coolant temperature of 303, 318 and 333K, respectively. At the coolant temperature below 318K, the diesel engine falters for a longer time and even cannot go to idle condition. After analyzing, it is found that at 200r/min, large amount of residual gases from the last cycle results in misfire. At 400r/min, no misfire happens. When the engine speed goes above 500r/min, the misfire cycle rate increases significantly due to the increased ignition delay period, leading to faltering at 400—500r/min. Under the altitude of 5km, when a flame intake preheating device was used and set its preheating power to 0.84kW at 200r/min and 400r/min, 1.25kW at 600r/min and 2.10kW at 800r/min, respectively, the misfire cycle rate drops to 0% across all speeds. Experimental results show that the flame-assisted intake preheating system used with a precise fuel control can effectively improve the starting performance of the diesel engine at plateau, reducing the engine starting time to within 4s at the altitude of 5km.
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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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