Research Article
Study on Premixed Combustion in a Diesel Engine with Ultra-multihole Nozzle
Table 7
Engine performance comparison between premixed combustion and original engine.
| Operating condition | Combustion way | EGR rate % | Excess air coefficient λ | Boost Pressure kPa | Injection pressure MPa | Injection starting point °CA ATDC | Soot g/kW·h | NOx g/kW·h | HC g/kW·h | CO g/kW·h | BSFC g/kW·h | CA50 | °CA |
| A | Conventional combustion | 0 | 4.41 | 6.3 | 50 | 0 | 0.0103 | 6.72 | 9.21 | 29.71 | 400.5 | 15.45 | −1.2 | Premixed combustion | 80 | 2.81 | 0 | 90 | −1.5 | 0.0059 | 3.10 | 14.85 | 56.44 | 402.0 | 16.2 | 5.1 |
| B | Conventional combustion | 0 | 3.5 | 9.4 | 50 | 0 | 0.0103 | 7.28 | 1.05 | 6.20 | 262.2 | 16.35 | −3.3 | Premixed combustion | 80 | 1.68 | 0 | 110 | −1.5 | 0.0012 | 1.49 | 5.08 | 21.23 | 274.8 | 17.87 | 4.1 |
| C | Conventional combustion | 0 | 2.75 | 13 | 50 | 0 | 0.0289 | 6.89 | 0.47 | 2.31 | 246.5 | 16.3 | −5.1 | Premixed combustion | 67 | 1.4 | 1.6 | 120 | 0 | 0.0099 | 1.17 | 3.79 | 19.67 | 263.0 | 20.3 | 3.4 |
| D | Conventional combustion | 0 | 2.25 | 40.2 | 75 | −2 | 0.0558 | 8.97 | 0.58 | 1.46 | 243.9 | 19.0 | −6.8 | Premixed combustion | 28 | 1.41 | 31.4 | 110 | 3 | 0.0291 | 2.05 | 1.36 | 14.19 | 261.2 | 20.95 | 0.3 |
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