The subject matter undertaken aims to show all significant changes in the combustion process of air and natural gas compared to the combustion of an air and gasoline mixture in an engine. The air-CNG mixture creates worse conditions for spark discharge due to higher resistance than the air-gasoline mixture. Furthermore, the air-CNG mixture burns more slowly, which is associated with much higher temperatures in the combustion chamber, significantly reducing the durability of the spark plug.These two significant differences mean that the ignition system must meet these unfavorable conditions for an engine fueled by an air and natural gas mixture.
After discussing the construction of the spark plug and taking into account the specifics of natural gas combustion, design modifications to the spark plug were proposed for the needs of igniting an air and natural gas (CNG) mixture.
DESIGN AND OPERATIONAL REQUIREMENTS TO CONSTRUCT PLUGS FOR CNG IGNITION
The taken subject matter is aimed to show all fundamental changes in the combustion process of air – natural gas mixture in comparison to air gasoline mixture combustion in the engine. Air – CNG mixture creates worse conditions for spark flashover due to higher resistance than air – gasoline mixture.
Moreover, the air – CNG mixture burns slower, what creates much more higher temperatures in the combustion chamber, what lowers spark plug durability.
These two fundamental changes cause that the ignition system has to fulfil such unfavourable conditions for an engine fuelled with air – natural gas mixture.
After the description of spark plug construction and taking into consideration the natural gas combustion peculiarity, constructional modifications of the spark plug were proposed to adapt it to the needs of air – natural gas (CNG) mixture ignition. (…)
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Source: Logistyka Magazine