Investigation on the mixture formation, combustion characteristics and performance of a Diesel engine fueled with Diesel, Biodiesel B20 and hydrogen addition

Abstract

An experimental and numerical study was performed to investigate the impact of Biodiesel B20 (blends 20% Rapeseed methyl ester with 80 % Diesel volumetric fraction) and different energetic fractions of hydrogen content (between 0 and 5%) on the mixture formation, combustion characteristics, engine performance and pollutant emissions formation. Experiments were carried out on a tractor Diesel engine, four-cylinders, four-stroke, 50 kW/ 2400 rpm, and direct injection. Simulations were conducted using the AVL codes (HYDSIM and BOOST 2013). Simulation results were validated against experimental data, by comparing the inline pressure, needle lift, in-cylinder pressure curves for Biodiesel B20 and pure Diesel fuels at 1400 rpm and 2400 rpm, respectively, under full load operating conditions. Good agreement with a maximum of 2.5% relative deviation on the peak results revealed that overall operation conditions Biodiesel B20 provides lower engine performance, efficiency, and emissions except the NOx which are slightly increased. The Biodiesel B20 has shorter ignition delay. By hydrogen addition to B20 with aspiration of the intake air flow the CO emissions, smoke, and total unburned hydrocarbon emissions THC decreased, while the NOx kept the same increasing trend for 1400 rpm and has not quite apparent trend for 2400 rpm. The enrichment by hydrogen of Diesel and B20 fuels has not a significant effect on ignition delay.

Effect of Biodiesel Mixture Derived from Waste Frying-Corn, Frying-Canola-Corn and Canola-Corn Cooking Oils with Various ‎Ages on Physicochemical Properties

“…Biodiesel is a fuel consists of mono-alkyl-esters of long-chain fatty acids, derived from vegetable oils or animal fats [5]. It has a higher viscosity [6], cloud point, and pour point temperatures [7] compared to diesel fuel. Various research studies have shown that biodiesel has received significant attention and it is a possible alternative fuel [8].…”

Experimental Investigations of Hydrogen Effects on Performance and Emissions of Renewable Diesel Fueled Rcci / Vandenilio Įtaka Energiniams Ir Emisijos Rodikliams Alternatyviu Dyzelinu Veikiančiame Rcci Variklyje – Eksperimentinis Tyrimas

“…The HRF used during tests has lower C/H ratio in compare to the petrol DF: PRO Diesel by 4.7% while HVO by 8.2%. On top of that, the increased hydrogen increment rate caused further decrease of C/H ratio and that causes reduction of CO and CO 2 emission (Figures 7 and 8) in the exhaust gas as well as reduction of its smokiness as shown at the Figure 9 (Aldhaidhawi, Chiriac, Bădescu, Descombes, & Podevin, 2017;Barrios et al, 2017;Rocha, Pereira, Nogueira, Belchior, & Tostes, 2016). Other reason is that, increase of HES makes better-homogenized mixture of air and LRF, which leads to the decrease of smokiness.…”

Rme Co-Combustion With Hydrogen in Compression Ignition Engine: Performance, Efficiency and Emissions / Slėginio Uždegimo Variklio Energinių, Efektyvumo Ir Deginių Emisijos Rodiklių Tyrimas Naudojant Rapsų Metilesterį Ir Vandenilį

“…The biggest influence on the ITE, was made by increased mass flow rate of the hydrogen as the response to the decreased total fuel mass flow rate and ISFC ( Figure 5). The increased hydrogen increment rate caused the decrease of C/H ratio and that causes the reduction of CO and CO 2 emission in the exhaust gas as well as reduction of its smokiness as shown at the Figure 8 (Aldhaidhawi et al, 2017;Barrios, Domínguez-Sáez, & Hormigo, 2017;Rocha, Pereira, Nogueira, Belchior, & Tostes, 2016).…”

“…Experiments carried out on the CI engine (Aldhaidhawi, Chiriac, Bădescu, Descombes, & Podevin, 2017) with fossil DF blended with 20 vol% of RME and HES of 0-5%, revealed the lower engine performance, efficiency, and emissions except the NO x , which slightly increased. Addition of hydrogen to the fuel blend, the CO emissions, smoke, and THC decreased.…”