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ISSN Печать: 1065-3090
ISSN Онлайн: 1940-4336
Indexed in
VISUALIZATION OF THE MIXING OF INTERMITTENT NATURAL GAS AND LIQUID DIESEL FUEL SPRAYS FROM HIGH-PRESSURE NOZZLES
Краткое описание
Dual fueling, with respect to compression ignition engines, is a process that allows the utilization of common alternative fuels that have a cetane number too low to be used alone. The alternative fuel requires the retention of diesel injection as a pilot ignition source. Conventional dual fueling pre-mixes the alternative fuel with air in the inlet manifold. However, this causes combustion problems, which limit the amount of fuel that can be substituted for the diesel. An alternative, studied here, is to directly inject both the alternative fuel as well as the original pilot diesel into the combustion chamber.
A purpose-built rig enabled the visualization of fuel jets into the simulated chamber of a diesel engine. Actual tests in an engine were not carried out since the purpose was to use good visualization to obtain details of the injection for modeling. Accordingly, repeatable, millisecond-duration flow visualization of these high-velocity events was essential work that would have been very difficult in an engine. Jets of both liquid diesel and natural gas were injected into the chamber first discretely and then with closely staged starting times and photographed using the shadowgraph and schlieren techniques.
The relative positioning of the injectors for the different fuels with respect to each other as well as their relative timing were then examined and conclusions drawn as to the optimal layout and staging. Using this information, computational models were calibrated. These models formed the basis of computational fluid dynamics simulation of the dual-fuel injection into an actual engine.
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Li Jingrui, Liu Haifeng, Liu Xinlei, Ye Ying, Wang Hu, Yao Mingfa, Investigation of the Combustion Kinetics Process in a High-Pressure Direct Injection Natural Gas Marine Engine, Energy & Fuels, 35, 8, 2021. Crossref
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Cong Yujin, Gan Huibing, Wang Huaiyu, Parameter investigation of the pilot fuel post-injection strategy on performance and emissions characteristics of a large marine two-stroke natural gas-diesel dual-fuel engine, Fuel, 323, 2022. Crossref