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Numerical study on the effect of injection pressure on high-pressure diesel spray
Citation
Ong, YL and Salehi, F and Ghiji, M and Garaniya, V, Numerical study on the effect of injection pressure on high-pressure diesel spray, Combustion Theory and Modelling, 25, (2) pp. 208-234. ISSN 1364-7830 (2021) [Refereed Article]
Copyright Statement
Copyright 2020 Informa UK Limited, trading as Taylor & Francis Group
DOI: doi:10.1080/13647830.2020.1851397
Abstract
This paper analyses the effect of injection pressures on spray and flame structures under
high-pressure diesel spray conditions using a three-dimensional Reynolds-Average
Navier-Stokes (RANS) model. The simulations are conducted using three kinetic mechanisms known as Luo (106 species), Cai (57 species) and Yao (54 species). Tabulation
and Dynamic Adaptive Chemistry (TDAC) solver is adopted to reduce the computational cost. The reacting results obtained using the Luo kinetic mechanism demonstrate
the best agreement with the experiment. The Cai and Yao chemistry models overpredict
and underpredict the ignition delay time respectively, whereas both mechanisms overpredict the flame lift-off length, particularly at higher injection pressures. It is found
that the error for the ignition delay time is larger at higher injection pressures while the
opposite is true for the flame lift-off length. The results reveal that at lower injection
rates, the cool flame, represented by the CH2O, occurs at richer mixture closer to the
nozzle. On the other hand, the heat release rate is lower while the CO emission is higher.
Detailed analysis on scalar fields shows that the Cai and Yao mechanisms lead to more
consistent results in capturing the temperature field in terms of high-temperature reaction zone while Yao and Luo mechanisms result in a more consistent trend in producing
the C2H2 species.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | high-pressure spray, TDAC, chemistry model, combustion, RANS |
| Research Division: | Engineering |
| Research Group: | Maritime engineering |
| Research Field: | Marine engineering |
| Objective Division: | Transport |
| Objective Group: | Environmentally sustainable transport activities |
| Objective Field: | Management of gaseous waste from transport activities (excl. greenhouse gases) |
| UTAS Author: | Ong, YL (Mr Yong Liang Ong) |
| UTAS Author: | Garaniya, V (Associate Professor Vikram Garaniya) |
| ID Code: | 142292 |
| Year Published: | 2021 (online first 2020) |
| Deposited By: | NC Maritime Engineering and Hydrodynamics |
| Deposited On: | 2021-01-06 |
| Last Modified: | 2021-06-08 |
| Downloads: | 0 |
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