BITS Faculty Publications

Permanent URI for this communityhttp://localhost:4000/handle/123456789/1867

Browse

Filters

2018 - 20203

Settings

Author: search.filters.author.Verma, SaketSubject: search.filters.subject.Biodiesel

Search Results

Now showing 1 - 3 of 3
  • No Thumbnail Available
    Item
    An experimental investigation of biodiesel-biogas dual-fuel engine based on energy and exergy analysis
    (Inder Science, 2018-06) Verma, Saket
    In the present work, exergy analysis has been performed on the biodiesel-biogas dual fuel (DF) engine. The DF operation has been studied with biodiesel (Jatropha curcas) as the pilot fuel to ignite the main fuel (biogas). The experiments were performed at a constant engine speed of 1500 rpm with varying engine loads and optimised injection timings for both diesel and DF modes. The results indicate that DF operation at low load produces poor performance and emission characteristics, however, no significant variations were observed between diesel-DF and biodiesel-DF operations. At 23% of engine load, exergy efficiencies were found to be 8.53% and 8.4% for diesel-DF and biodiesel-DF operations respectively; compared to 12.57% for pure diesel operation. Nevertheless, at higher loads, exergetic performances of DF operations were significantly improved. Furthermore, oxides of nitrogen (NOx) emissions from DF operations were significantly reduced compared to that with diesel operation.
  • No Thumbnail Available
    Item
    Effect of Hydrogen Enrichment Strategy on Performance and Emission Features of Biodiesel-Biogas Dual Fuel Engine Using Simulation and Experimental Analyses
    (ASME, 2020-12) Verma, Saket
    In the present work, hydrogen enrichment in biogas is studied as a potential approach to improve the performance and emission features of a biodiesel-biogas dual fuel engine. A single-cylinder diesel engine is modified to operate in dual fuel mode using Jatropha curcas biodiesel as the pilot fuel and biogas as the main fuel. An electronic control unit is developed in-house to study 5−20% hydrogen enrichment in biogas using the timed manifold injection (TMI) technique. A three-dimensional computational fluid dynamics-based simulation methodology is presented for optimal selection of TMI parameters to ensure efficient and safe operation of the engine. Subsequently, the optimized injection conditions are used for the experimental evaluations, which are performed for performance and emission characteristics of the engine at low and high engine loads. Engine performance is analyzed based on energy and exergy analyses, whereas hydrocarbon (HC), carbon monoxide (CO), oxides of nitrogen (NOx), and smoke emissions are analyzed for emission characterization. The simulation results show that the injection angle and injection pressure influence in-cylinder mixture formation and hydrogen accumulation in the intake manifold. A combination of injection angle = 60 deg and injection pressure = 150 kPa offers good mixture formation. Experimental results show that at 20% hydrogen enrichment, exergy efficiencies of the dual fuel engine are increased from 8.4% to 10.1% at low load and 23.3% to 25.5% at high load. However, maximum reductions in HC and CO emissions of 35.6% and 50.0%, respectively, are calculated at low load
  • No Thumbnail Available
    Item
    A renewable pathway towards increased utilization of hydrogen in diesel engines
    (Elsevier, 2020-02) Verma, Saket
    In the present work, dual fuel operation of a diesel engine has been experimentally investigated using biodiesel and hydrogen as the test fuels. Jatropha Curcas biodiesel is used as the pilot fuel, which is directly injected in the combustion chamber using conventional diesel injector. The main fuel (hydrogen) is injected in the intake manifold using a hydrogen injector and electronic control unit. In dual fuel mode, engine operations are studied at varying engine loads at the maximum pilot fuel substitution conditions. The engine performance parameters such as maximum pilot fuel substitution, brake thermal efficiency and brake specific energy consumption are investigated. On emission side, oxides of nitrogen, hydrocarbon, carbon monoxide and smoke emissions are analysed. Based on the results, it is found that biodiesel-hydrogen dual fuel engine could utilize up to 80.7% and 24.5% hydrogen (by energy share) at low and high loads respectively along with improved brake thermal efficiency. Furthermore, hydrocarbon, carbon monoxide and smoke emissions are significantly reduced compared to single fuel diesel engine operation. Exhaust gas recirculation (EGR) has also been studied with biodiesel-hydrogen dual fuel engine operations. It is found that EGR could improve the utilization of hydrogen in dual fuel engine, especially at the high loads. The effect of EGR is also found to reduce high nitrogen oxide emissions from the dual fuel engine and brake thermal efficiency is not significantly affected.