Effect of operating parameters and antioxidant additives with biodiesels to improve the performance and reducing the emissions in a compression ignition engine - A review

It is an overwhelming argument that the use of biodiesel in diesel engine causes slight decrease in performance and reduction in exhaust emissions but at the expense of oxides of nitrogen (NOx) emission. In order to improve the performance without sacrificing the advantage in terms of exhaust emissions, it is essential to vary the engine operating parameters such as compression ratio (CR), injection pressure (IP) and injection timing (IT). Nowadays, treatment of biodiesel with antioxidant additive is a promising approach to reduce the NOx emission because it reduces the hydrogen free radicals, which is responsible for prompt NOx formation during combustion process. Hence, in the present review a detailed study has been carried out with the operating parameters and antioxidant additives used in biodiesel operated diesel engine so that its performance can be improved and exhaust emissions were reduced.