Abstract
Natural gas is known as a potential alternative fuel for internal combustion engine due to several advantages such as high octane-number (ON = 130), environment friendly property, safety usage or high low heating value. To enhance reserve capacity on transportation vehicles, the natural gas was compressed to 250 bars into the special cylinder and called CNG fuel. Although high octane-number, the CNG spark ignition engines are without difficulty reached to the knocking combustion when the compression ratio of spark ignition engine was high, too. The main factor of this complication has demonstrated in the previous researches which were the low heating value of natural gas. Therefore, the goal of this study not only is to find out the compression ratio limit for port injection natural gas converted engine by means of simulating research but also enhanced the mass fraction burned. The name’s software using in this study that is AVL Boost, the calculation results were focused on solving the process to get the required octane number as well as the compression ratio limit of real engine. The obtained results showed that, for engine operation in the range of n = 1000–2200 rpm without knocking risk, the converted engine should be fixed the compression ratio at ε = 10. In case of higher compression ratio, the engine should be extended lambda and/or the range of engine speed. Especially, the burning rate of natural gas was increased by varying the bowl-in-piston geometry, and the cause of this increase was due to the enhancement of squish velocity.
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Le, S., Chan, H., Quoc, T. (2022). A Study on the Effect of Compression Ratio and Bowl-In-Piston Geometry on Knock Limit in Port Injection Natural Gas Converted Engine. In: Le, AT., Pham, VS., Le, MQ., Pham, HL. (eds) The AUN/SEED-Net Joint Regional Conference in Transportation, Energy, and Mechanical Manufacturing Engineering. RCTEMME 2021. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-19-1968-8_6
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