A study of vcr diesel engine fuelled with marotti bio diesel using cfd and rsm

Abstract

Straight vegetable oils are non-conventional in nature and can be directly used as fuels in diesel engines. However, their high viscosity and poor volatility lead to reduced thermal efficiency and increased CO, smoke density and HC. Transesterification is one of the method, by which viscosity could be reduced drastically and the fuel could be adopted for conventional compression ignition engine. This transesterified vegetable oil is popularly known as Bio-diesel (or) Vegetable Oil Methyl Ester (VOME). In our work, an experimental study has been conducted to measure the engine performance, combustion and emission characteristics of marotti (Hydnocarpus Wightianus) bio-diesel (methyl ester of marotti oil) and its mixtures with conventional diesel fuel. The same work has been extended by using CFD and RSM techniques. The results for the same has been compared and presented. The Marotti bio-diesel or Marotti oil Methyl Ester (MOME) has been produced using Methanol (CH3OH) as solvent and sodium hydroxide (NaOH) as base catalyst during the transesterification process. The MOME has been mixed with the base (conventional) diesel in the ratio of 10:90, 15:85 and 20:80. The performance, combustion and emission characteristics of these mixtures on the VCR with the compression ratio of 14:1, 16:1 and 17:1 have been investigated and compared the experimental results with the conventional diesel engine. The multi-fuel capability is increased by the VCR engines since they can improve the low load operation and capability of starting. The CFD analyzed the feasibility of the VCR engine design for the process of opening the exhaust valve during the compression strokes of various compression ratios. The model is modified so that the simulation of 14:1 and 17:1 are similar The second valve opening at the 17:1 would be developed on their initial opening of the stroke. The fuel is injected when the valve of the exhaust is closed, by which the BSFC would be increased. The Design of Experiment (DoE) is performed by the Response Surface