| viXra.org > Thermodynamics and Energy > 2409 |
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| viXra.org > Thermodynamics and Energy > 2409 |
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[2] viXra:2409.0104 [pdf] submitted on 2024-09-19 23:01:53
Authors: Ryong Song Han, Nam Su Kim, Yong Jae Min, Hui song So, Chol Jin Kim
Comments: 12 Pages.
Worldwide, there is a growing interest in the use of diesel-ethanol blends in compression ignition engines as a way to reduce vehicle emissions and use alternative fuels. The previous studies with the focus on the reduction of emission and the improvement of performance for compression ignition engine using ethanol shows that the combustion characteristics should not be missed. In this paper, the effect of ethanol content on combustion properties of diesel engine fueled with diesel-ethanol blends using two phase combustion model (combustion model of premixed -diffusion combustion) of the virtual engine simulation tool GT-SUITE was investigated. For the purpose of the study, the engine simulation tool was used to compare the Computed data with the benchmark data for the variation of ethanol content (0-40%) and to analyze the characteristics of auto-ignition, premixed combustion and diffusion combustion. The simulation results of combustion characteristics using diesel-ethanol blend showed that the auto-ignition delay increased and the premixed combustion ratio increased. The results of the study showed that the combustion model of premixed combustion -diffusion combustion can be used to perform combustion characteristics and performance analysis in a compression ignition engine using ethanol-diesel blend and to estimate the ethanol content to achieve the desired working performances.
Category: Thermodynamics and Energy
[1] viXra:2409.0101 [pdf] submitted on 2024-09-19 22:59:08
Authors: Ri Kyong Hyok, Kim Kwang Sok, Kim Ryong Pom
Comments: 25 Pages.
In this paper, we present a control method for the control plant subject to the constraint on the power spectral density of the control input. The constraint condition on the power spectral density is defined using the periodogram. This constraint is represented as a quadratic inequality on the combination of the control inputs of the adjacent several time steps. To constrain the power spectral density of the control input, the finite impulse response filter is connected to the input channel of control plant and the constrained model predictive controller is used. The filter is designed so that when it receives the amplitude-constrained signal its output signal satisfies the constraint on the power spectral density. The model predictive controller with the amplitude-constrained output controls the augmented plant which consists of the control plant and the filter. Numerical simulations verify the effectiveness of the proposed method.
Category: Thermodynamics and Energy
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