CNG Injector Research for Dual Fuel Engine

Abstract

The article presents the tests results of the prototype design of hydraulically assisted injector that is designed for gas supply into diesel engines. The construction of the injector allows for its positioning in the glow plug socket, so that the gas is injected directly into the combustion chamber. The cycle analysis of the four-cylinder Andoria ADCR engine with a capacity of 2.6 dm 3 for different crankshaft rotational speeds allowed to determine the necessary time for fuel injection. Because of that, it was possible to determine the required mass flow rate of the injector, for replacing as much of the original fuel by gaseous fuel. To ensure a high value of flow inside the injector, supply pressure equal to 1 MPa was applied. High gas supply pressure requires high value of valve opening forces. For this purpose a injector with hydraulic control system, using a liquid under pressure for the opening process was designed. On the basis of air pressure measurements in the flow line after the injector, the analysis of opening and closing of the valve was made. Measurements of outflow mass of the injector were also carried out. The results showed that the designed injector meets the requirements necessary to supply ADCR engine with CNG fuel.

Investigation of Harmful Chemical Compounds from Dual-Fuelled Diesel Engine

“…It should be pointed out that the mentioned problem of excessive hydrocarbon emissions due to valve overlap can be limited by gas injection directly to the combustion chamber. An example of such concept was presented by Majczak et al [14].…”

Computational analysis of mixing characteristics of port-injected bioCNG with air for different designs of intake manifold

“…There are certain techniques to reduce NO X and PM emissions, but their simultaneous reduction is not an easy task. This is currently being done by fine-tuning the combustion parameters and the use of exhaust gas recirculation (EGR) (Majczak et al, 2017). Besides, it is also reported that around 30% of the carbon monoxide (CO) and hydrocarbon (HC) emissions are emitted by transport vehicles (Garg and Ravikrishna, 2010).…”

“…The gas fuels, which are used for this purpose, are mainly, compressed natural gas (CNG) and liquefied petroleum gas (LPG). These engines are currently used in Europe for urban passenger transport, goods, and garbage collection, constituting a market share of 50% (Majczak et al, 2017). However, this requires significant modification in the engine, thereby a complete change in the ignition method and hence costly.…”

Strength Analysis of the CNG Direct Injector for the Combustion Ignition Engine in Real Driving Conditions

“…Its widespread use is generally attributed to an uncomplicated installation of an additional alternative fuel supply system in almost every car originally fuelled with petrol. Current research works aim to explore the possibility of powering compression-ignition engines with this fuel [6,7,8,9,10]. However, along with the development of LPG fuelling methods, the same emphasis is placed on the dissemination of CNG fuelling of combustion engines.…”