Intake Manifold Of Internal Combustion Engine Research Articles

An approach to computational fluid dynamic air-flow simulation in the internal combustion engine intake manifold

The subject of this paper is modeling of an intake manifold of a four-stroke IC engine using contemporary software tools. Virtual 3D CAD model of an intake manifold was designed based on a real intake manifold of a four-stroke IC engine. Based on the CAD model a 3D CFD model of the intake manifold was created. The modeling has been done with the purpose of simulation of the air flow inside the intake manifold in order to monitor values of the internal pressure during several seconds of the engine operation in three different operating points. Also, an experiment was conducted, which included measurements of intake manifold pressure in the same engine operating points in the course of a time interval of approximately the same duration. The results of both the simulation and the experimental measurements have been shown in the paper proving that the created model was good enough for the intended purpose.

Vehicle SI Engine with MPI of Liquid State LPG

Abstract The first part of the article reviews the possible methods for LPG and air mixture forming (injection of gaseous or liquid state LPG) and their influence on the operating properties of an SI engine. The next chapter explains the processes that take place when liquid state LPG is injected into the air flow of an internal combustion engine intake manifold. A simplified calculation is used to show that the injection of liquid state LPG is associated with extreme low temperature of the LPG injected into intake manifold and with ice formation on the outlet nozzle. The article sets out the design of an end part injector (EPI) for liquid state LPG that reduces the risk of icing of the outlet nozzle. The results of experimental research indicate very good operational properties for a vehicle SI engine with the combustion mixture formed by the injection of liquid state LPG into the engine intake manifold. The calculation results are confirmed by recording plots of LPG pressure inside the end part of injector (EPI) and the temperature on the outlet nozzle (ON) of the LPG injector. Visual inspection of injection of liquid state LPG into the intake manifold clearly supports the performed measurements. The conclusions summarize the knowledge gained from the laboratory investigation of liquid state LPG injection into an engine intake manifold.

High-Speed Multiplexed Spatiotemporally Resolved Measurements of Exhaust Gas Recirculation Dynamics in a Multi-Cylinder Engine Using Laser Absorption Spectroscopy.

The need for more environmentally friendly and efficient energy conversion is of paramount importance in developing and designing next-generation internal combustion (IC) engines for transportation applications. One effective solution to reducing emissions of mono-nitrogen oxides (NOx) is exhaust gas recirculation (EGR), which has been widely implemented in modern vehicles. However, cylinder-to-cylinder and cycle-to-cycle variations in the charge-gas uniformity can be a major barrier to optimum EGR implementation on multi-cylinder engines, and can limit performance, stability, and efficiency. Precise knowledge and fine control over the EGR system is therefore crucial, particularly for optimizing advanced engine concepts such as reactivity controlled compression ignition (RCCI). An absorption-based laser diagnostic was developed to study spatiotemporal charge-gas distributions in an IC engine intake manifold in real-time. The laser was tuned to an absorption band of carbon dioxide (CO2), a standard exhaust-gas marker, near 2.7 µm. The sensor was capable of probing four separate measurement locations simultaneously, and independently analyzing EGR fraction at speeds of 5 kHz (1.2 crank-angle degree (CAD) at 1 k RPM) or faster with high accuracy. The probes were used to study spatiotemporal EGR non-uniformities in the intake manifold and ultimately promote the development of more efficient and higher performance engines.