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Numerical Analysis of Soot and NOx in Marine Engines University of Cambridge; CARES Singapore
- Format:
- Book
- Conference/Event
- Author/Creator:
- Trivedi, Shrey, author.
- Conference Name:
- 15th International Conference on Engines & Vehicles (2021-09-12 : Capri, Italy)
- Language:
- English
- Physical Description:
- 1 online resource cm
- Place of Publication:
- Warrendale, PA SAE International 2021
- Summary:
- A large marine diesel engine is simulated in order to gain insight into its emission characteristics, particularly soot and NOx emissions. The simulation setup is based on ETH-LAV single cylinder MTU396 heavy duty research engine. Only a section of the engine containing a single injector-hole is simulated, allowed due to symmetry. Dodecane is used as a surrogate to emulate the evaporation properties of Diesel and the n-heptane 22-step reaction mechanism of is used to describe combustion. The flow is simulated using unsteady RANS (URANS) while combustion is modelled using the Conditional Moment Closure (CMC) method. A two-equation model, implemented within the CMC framework, is employed for determining soot while the extended Zeldovich mechanism is used for predictions regarding thermal NOx. The start of injection (SOI), the duration of injection (DOI) and the oxygen mass fraction are all varied systematically around a reference condition to study their respective impacts on the predictions. The resulting soot mass fraction from the simulations is found to increase for the case of SOI closer to the top dead centre (TDC) and also for the cases of lower oxidiser mass fractions. NOx exhibits the opposite behaviour in that its mass fraction decreases for SOI closer to TDC and for lower oxidiser mass fractions. An increase in DOI results in higher mass fractions of both soot and NOx. These trends show good agreement with the results from experiments and are consistent with previous studies. Post-processing of the CFD solution to incorporate a range of more expensive soot models that can capture soot particle size distribution (PSD) based on an Incompletely Stirred Reactor (ISR) theory is underway so that predictions of PSD can be compared against experiments for a range of operating conditions
- Notes:
- Vendor supplied data
- Publisher Number:
- 2021-24-0041
- Access Restriction:
- Restricted for use by site license
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