The Investigation Of Bio-additives For Gasoline On Engine Performance And Combustion Characteristic

Fuel additive is one of most effective ways to improve the performance of gasoline. Adding the bio-additive to the gasoline could solve the problem of the pollution to the environment and the poison to the after treatment of the tetraethyl lead and MTBE. The bio-additive is renewable and also friendly to the environment. In order to displace MTBE and to realize the sustainable developments of energy source, the bio-additive has a good future.In this dissertation, one bio-additive extracted up from tropic plant can improve the gasoline burning efficiency. The bio-additive was added into two kinds of commercial gasoline of 93#, which are called super-clean gasoline and ethanol-gasoline respectively. Through engine bench tests, the fuel economy and emissions with and without the bio-additive were compared and analyzed. In this dissertation, based on analysis for the combustion in a constant volume combustion bomb, the parameters such as combustion delay period, combustion-flame propagation have been investigated.The results showed that when the engine ran on the fuel with the bio-additive, the fuel economy was improved effectively. When the bio-additive adding into the super-clean gasoline, the engine emissions like carbon monoxide (CO) and nitric oxide (NOx) were reduced, only except unburned hydrocarbon (HC) increased slightly. What's more, the bio-additive shows its remarkable characteristic that can decrease CO₂ emissions from gasoline engines. For the ethanol-gasoline, when adding the bio-additive, the NO_x emissions remained the same level as usual, but HC and CO₂ decreased compared with the basic fuel. Through the measurements of combustion in a constant volume combustion bomb, the characteristic of bio-additives to promote burn was obtained.Through research on the feasibility of the bio-additive to different kinds of gasoline, it can be found that the bio-additive is effective to fuel economy and emissions. Therefore the bio-additive is not only significant to reduce greenhouse gases, but also is very important to sustainable development of fuel sources. The research on combustion performance is very important for later research on the bio-additives'mechanism.