Abstract
Devices for reducing environmental pollutant emissions are being installed in ship compression ignition (CI) engines; alternatively, the designs of intake and exhaust pipes and ports are being modified to tune the performance according to the user’s needs. In both cases, substantial computation time and cost are required to simulate the gas flow of the CI engine with an air-intake system. In order to simulate the air-intake system of the CI engine, which changes according to the user’s needs, at a low cost and in a short time, we aimed to analyze the gas flow using a 1D–3D coupled method. The 1D zone was analyzed using the method of characteristics, and the 3D zone was analyzed using the commercial computational fluid dynamics (CFD) code Ansys Fluent R15.0, whereas their coupling was achieved by applying the developed 1D–3D coupling algorithm to Ansys Fluent R15.0 using user-defined functions (UDFs). In the comparison of the pressure of the intake pipe with the experimental result, the average error was 0.58%, thereby validating the approach. In addition, when analyzing the intake pipe and port in a 3D zone, the results of the velocity and pressure were expressed as contours, allowing them to be visualized. It is expected that the 1D–3D coupling algorithm of the air-intake system can be used to reflect the user’s needs and can be used as a method to quickly and accurately calculate the gas flow within tens of minutes.
Highlights
It is important for ship engines to reduce emissions of environmental pollutants, while maintaining performance, efficiency, and stability
A 1D–3D coupling algorithm was developed for the air-intake system of a compression ignition (CI) engine, and the result of analyzing gas flow through its application was verified by comparing it with an experimental study
In terms of the peak pressure of the cylinder, the magnitude and phase of the pressure were similar to the experimental results, and the pressure result of the cylinder during the intake gas exchange process was similar to the experimental results, thereby verifying the results
Summary
It is important for ship engines to reduce emissions of environmental pollutants, while maintaining performance, efficiency, and stability. 1D–3D coupling function built in a commercial code was used, and a method of predicting the performance of a diesel engine was proposed using the results of gas flow analysis. We intend to use the 1D–3D coupling gas flow analysis method of the air-intake system proposed in this study to predict the flow state and performance according to the shape of the intake system in the development stage of ship CI engines. By reducing the computational time required for numerical analysis of the gas flow of the entire engine system to a level of several minutes, we intend to use it to develop a simulation model that can respond quickly to changes in the intake and exhaust systems. We will discuss the theory used in the calculation of the 1D zone, the 1D–3D coupling method, and the verification compared with the experimental results
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