Performance map of a LPG-diesel dual-fuel engine based on experimental and non-linear least squares determined wiebe function

Scientific African

Ligan Noukpo Moïse¹  Ngayihi Abbe Claude Valery²  Issondj Banta Junior Nelson²  Tchato Yotchou Giovani Vidal³  Mezoue Cyrille³  Mouangue Ruben³  Anye Ngang Emmanuel³ 

[1] Corresponding author at: Mechanical Engineering, University of Douala, Higher National Polytechnic Scholol of Douala, Douala, Cameroon.;National Higher Polytechnic School of Douala, University of Douala;Laboratory of Energy, Materials, Modeling and Method of the University of Douala;

关键词: LPG-Diesel Dual-Fuel engine;    Wiebe function;    Engine map;    Nonlinear least square method;    Gaussian Model;   

DOI  :  

来源: DOAJ

【 摘 要 】

The achievement of sustainable and climate-friendly economies by means of renewable energies, and the transformation into competitive and industrialized economics are among the goals fixed by the African Union (AU) by the year 2063. The implementation of new technologies allowing the achievement of high-level performances in the field of transport and manufacturing industries through low-polluting energy systems is therefore imperative in achieving these objectives. Dual-fuel engines, which combine the low-polluting properties of natural gas and the performance of diesel, present interesting prospects in this regard. Modern engines need to be designed and monitored using an experimentally generated map, which comes at a certain cost. In this work, we present the development of a dual-fuel engine map based on a new model implemented using the nonlinear least squares method in which the Wiebe coefficients are trained for different speeds using Gaussian models. The model is validated with an error of 2% against experimental data. The generated map with the mass fraction of the primary fuel z, equivalence ratio Φ, and engine's speed as varying parameters shows a decrease in specific consumption as z and speed increase. Thermal efficiency decreases as the equivalence ratio increased. Nitric Oxide (NOx) emissions decrease with the increase of Φ and increase with speed, whereas unburnt hydrocarbon (HC) emissions increase with the equivalence ratio and speed. It is found that for an increase in speed of 0.2%, and in z by 2.1%, the specific consumption decreases by 0.1%. An increase in Φ of 0.1% leads to a decrease of NOx emissions by 0.25%. These results comply with previous experimental works, thus showing the relevance of the use of simulation-based engine maps in dual-fuel engine design.

【 授权许可】

Unknown