The research of exploitation characteristics of diesel engines running on second generation biofuel blends

Justas Žaglinskis

Doctoral dissertation

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The relevance of dissertation research is determined increasing efficiency of energy use and reduction of environmental pollution in the transport sector. In order to accomplish the complex research of diesel engines (running on 2nd generation FAME, alcohol and diesel blends) performance indicators the experimental, simulation and methodological tasks are solved in dissertation.

The analysis and evaluation of effect of fuel blends use in passenger car and vessel auxiliary diesel engines is presented in dissertation.

The problem, aim, tasks of research work formulated after analysis of transport sector structure, the importance of air pollution and energy consumption and the EU's strategic plans.

The blends of 1st and 2nd generation biofuels were investigated using laboratory equipment and in the exploitation conditions. 2 and 3 component blends of diesel, methanol, butanol, rape methyl/butyl esters were tested in diesel engines. Tested 2nd generation FAME blends: False flax (lat. Camelina sativa) with pork lards FAME and sea algae (lat. Clorella sp.). The comparable research of parameters while engine ran on diesel and blends was carried out. In the case of blends use the energy efficiency increases ~1–4%; at slightly increased NOX concentration the CO and CH concentrations decreased up to 20% and exhaust smoke, and smokiness decreased – 55–85%.

The evaluation of thermal and mechanical load criteria which indicate 1.9 TDI 1Z engine reliability operating on diesel fuel and blends was carried out.

There was analysed the influence of biodiesel oxidative degradation on 320 DMG work parameters while operated on B30 of 1st gen. rape and 2nd gen. Camelina sativa methyl esters. The storage period for efficient engine operation on B30 was determined: Camelina sativa – 8 and rape FAME – 14 months.

Using AVL Boost and Impuls models a methodology was developed that, in the case of limited amount of experimental data, gives possibility to simulate engine operating parameters, characteristics. The base of methodology is inverse task solution of heat release characteristics determination according in-cylinder pressure. For the solution according provided methodology the heat release parameters m and φz are necessary. For their determination the existing T. Bulaty and W. Glanzman methodology was modified. Indirectly determining m and φz that simplifies experiments the modified inverse method used also the relative change of exhaust gas pipe surface temperature while 1.9 TDI 1Z engine works on different load regimes, and G. Woschni and F. Anisits methodology.

Base on experiments the energy and environmental efficiency of B30 and B50 blends instead diesel in Lithuanian fishing vessel segment was calculated. 

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145×205 mm
180 p.
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