Abstract
Modern engine research uses multi-dimensional Mathematical Models (MMs) that are applicable to multi-fuel engines. However, their use involves the availability of detailed technical data on the design and characteristics of the engine, which is not always possible. The use of a one-dimensional MM is more expedient for the prediction of engine parameters, but their application for this purpose has not yet been sufficiently investigated. This publication presents the results of numerical studies evaluating the application of a one-dimensional MM with bi-phase Vibe combustion laws for dual-fuel (DF) Diesel (D) and Natural Gas (NG) engine power parameters. The motor test results of a high-speed 4ČN79.5/95.5 Diesel Engine (DE) with a conventional fuel injection system were used as adequacy criteria. The engines were operated with D100 and DF D20/NG80, in high- (HLM), medium- (MLM), and low- (LLM) load modes, and the angle of Diesel-fuel Injection Timing (DIT) was changed from −1 to −13 °CA in the Before Top Dead Center (BTDC) range. Modelling of the single-phase Vibe combustion law has limited applicability for efficient use only in HLM (with an error of 7%). In the MLM and LLM regimes, owing to non-compliance with real bi-phasic combustion with a strongly extended NG diffusive second phase, the modelling error is 50%. Individual MM matching in MLM and LLM in a DF D20/NG80 experiment detected a burn time increase from between 45 and 50 °CA, to 110 and 200 °CA, respectively. Limited use of the one-dimensional MM in the evaluation of DF engine performance has been identified. When comparing a one-dimensional MM with experimental data, a bi-phase law of heat release characteristic should be considered for better coincidence. In addition, individual MM matching with an experiment on each engine load mode ensured acceptable accuracy in testing and optimising the parameters of the indicator process, including DIT.
Highlights
The use of Natural Gas (NG) for the conversion of petroleum-derived fossil fuels in Diesel Engine (DE) is a promising approach for the strategic reduction of harmful emissions and greenhouse gas emissions in transport (IMO 2019a, 2019b; Arteconi et al 2010; EC 2018)
The engines were operated with D100 and DF D20/NG80, in high- (HLM), medium- (MLM), and low- (LLM) load modes, and the angle of Diesel-fuel Injection Timing (DIT) was changed from −1 to −13 °CA in the Before Top Dead Center (BTDC) range
In each operating mode, characterized by the combination – pme, n, jinj, the engine parameters were investigated using pure D, DF D/NG according to the compositions D60/NG40, D40/NG60, and D20/NG80
Summary
The use of NG for the conversion of petroleum-derived fossil fuels in DE is a promising approach for the strategic reduction of harmful emissions and greenhouse gas emissions in transport (IMO 2019a, 2019b; Arteconi et al 2010; EC 2018). The activity field of the active radical distribution of OH radicals in the work mixture, at the previous angle of the pilot fuel injection, provides an energy efficiency improvement of 7.5% and a five- to six-fold reduction in harmful emissions of CnHm, CO and NOx. in the initial research phase in addition to the modern practice of multi-dimensional ICE MMs, including conversions to DF engines, well-approved one-dimensional and phenomenological MMs agree with the results of experimental research (Ivanchenko et al 1983; Lebedev et al 2003). The results of mathematical modelling are compared with experimental engine test result data
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
