Abstract
This study presents the optimization of the intake manifold and the optimized flow rate of the acetylene gas which acts as a low reactivity fuel to achieve the superior performance and emission characteristics used in the Reactivity controlled compression ignition (RCCI) engine. Intake manifold is one of the engine components which are an important factor in determining the quality of combustion. A very recent evolution of the RCCI engine using the low temperature combustion technique requires a low reactivity fuel which is injected through the secondary fuel injector. The secondary fuel injector must be designed and optimized to allow the acetylene gas to maximize the engine performance and the amount of acetylene gas in liters per minute required for better combustion. If the secondary fuel injector is mounted apart from the critical point, then the performance of the RCCI engine may be poor and also if the acetylene gas is not supplied properly, there is a risk of poor combustion and also if the acetylene gas is supplied excessively, there is a risk of knocking along with the backfire due to the excess fuel charge accumulation during the combustion process. Physical testing of the secondary fuel injector in the intake manifold with different angles, distance and flow rate of supply of acetylene gas is time and cost consuming process. To mitigate this issue optimization is done through computational fluid dynamics principles comes in handy to minimize time and money. In our study, ANSYS-FLUENT software is used for simulation purposes. Optimization of acetylene gas injector distance is carried out by analyzing the pressure contours at the entrance of the combustion chamber. The optimized flow rate of acetylene gas and the injector inclination is found by analyzing the flow contours of turbulent kinetic energy and turbulent dissipation rate.
Highlights
Due to the industrial revolution that has taken place over the last decades, the role of the transport and power sectors is very significant
İlhak et al [13] experimented with the Spark Ignition engine fueled by gasoline, ethanol and acetylene at 25% and 50% loads, and the results show that acetylene gives better performance and emission characteristics than other fuels
The mixing pattern of air and acetylene in the intake manifold is analysed using ANSYS-FLUENT software in order to achieve better combustion characteristics of DI diesel engine operating on Reactivity controlled compression ignition (RCCI) mode
Summary
Due to the industrial revolution that has taken place over the last decades, the role of the transport and power sectors is very significant. Very few researchers have concentrated on optimizing the intake manifold for diesel engine operating in dual fuel mode. It is observed that the length of the runner is determined by assuming that the speed of the pressure wave is equal to the sound wave (343 m/s) It is noted from the above literature that the use of RCCI combustion technology leads to the achievement of favorable performance and emission characteristics, in particular the attainment of ultra-low NOx emissions. The use of gaseous fuels such as acetylene gas as a secondary fuel improves the rate of combustion and improves performance and emission characteristics. The use of the RCCI combustion strategy is carried out in conjunction with gaseous fuel such as acetylene gas supplied through the intake manifold. For each distance, the injector is placed at 3 different angles as 45° − 60° and 90°, in order to achieve an optimized configuration of the injector
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