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CFD model of the CNG direct injection engine

Czyż Z., Pietrykowski K.

Advances in Science and Technology. Research Journal

2014

Vol. 8, nr 23

45--52

The paper presents CFD analysis of fuel flow in the CNG injector. The issues such a pressure drop along an injector channel, mass flow through the key sections of the injector geometry, flow rates, the impact of the needle shape on the deflection of the sprayed gas cone and the impact of the wall head are analyzed in the article. The simulation was made in the transient states conditions for full injection process, including the opening and closing of the injector. An injection time of 6 ms, velocity of 0.33 mm/ms and a lift of 0.5 mm were selected for opening and closing of injector based on experimental test. The simulation shows that the volume inside the injector is a kind of fuel accumulator, and the opening process of the needle influence the flow parameters in an inlet cross-section after a certain time, depending on a channel cross section. The calculations allowed to select the ratio of an injector duct cross sectional area to the aperture area of the injection capable of the reducing pressure loss. The unusual location of the injector in the socket of a glow plug in the Andoria ADCR engine makes a stream be impaired by a part of the head. This research result would be useful in developing an injector construction which will be used for an investigation of CNG addition into diesel engine.

Experimental study of the direct methane injection and combustion in SI engine

Klimkiewicz D., Teodorczyk A.

Journal of KONES

2006

Vol. 13, No. 2

205-211

This paper reports on experimental study performed in a single cylinder SI research engine with the direct injection of methane to the cylinder. The methane injection was performed during compression stroke just before TDC – at the similar period as fuel injection occurs in Diesel engines. One of the main goals for direct injection of methane to the cylinder is the improvement of volumetric efficiency of the engine in comparison with standard method of gas mixture formation with the mixer. Direct methane injection creates many problems with proper mixing. The time available for mixing of the injected gas with the air is very short and the gaseous jet penetration in the combustion chamber volume and its ignition and mixing with the air is weak. During the study several design parameters, such as, position of ignition, direction of methane jet, douse piloting, were tested on their influence on ignition and combustion process. The high pressure injector was used for methane injection with the pressure of injection equal to 10 MPa. As a result of the experimental investigations a number of pressure profiles and the corresponding series of the frame schlieren pictures of the injection and combustion processes were obtained.