Research Article
Study on Premixed Combustion in a Diesel Engine with Ultra-multihole Nozzle
Table 5
Effect of combustion chamber on combustion parameter.
| | Operating condition | Type of combustion chamber | Intake boost pressure KPa | Injection pressure MPa | EGR rate % | Excess air coefficient λ | Injection starting point θ 1 °CA ATDC | Injection end point θ 2 °CA ATDC | Combustion starting point θ 3 °CA ATDC | Ignition delay
θ 3–θ 1 °CA |
θ 3–θ 2 °CA |
*CA50 °CA ATDC |
| | A | Original | 3.5 | 55 | 10 | 3.55 | 0 | 4.5 | 4.4 | 4.4 | −0.1 | 17.6 | | Straight port | 0 | 90 | 80 | 2.81 | −1.5 | 3 | 8.1 | 9.6 | 5.1 | 16.2 |
| | B | Original | 7.8 | 80 | 15 | 1.88 | 3 | 8.6 | 7.5 | 4.5 | −1.1 | 25 | | Straight port | 0 | 110 | 80 | 1.68 | −1.5 | 4.1 | 8.2 | 9.7 | 4.1 | 17.9 |
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*CA50 denotes the crank angle of 50% total heat release rate.
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