Analysis of injection pressure and butanol additive on biodiesel blends on combustion and emission production.

Rapid compression machine was designed for simulate the engine combustion phenomenon in order to study its physical and chemical behaviour at specific pressures and temperatures. These research have been conducted to study the effect of biodiesel blending ratio of palm oil biodiesel with butanol additive on combustion and emission. The biodiesel used which were palm oil biodiesel with butanol additive (BU5, BU10, BU15, and BU20) have been injected into the combustion chamber by the used of Denso spray injector. Injection pressure for this research were 80 MPa and 90 MPa at varied ambient temperature of 750K, 850K, and 950K. The result shows as the blending ratio of BU fuels increased, the ignition delay became shorter at low injection pressure. Short ignition delay let complete combustion process to occur which good for engine performances. This condition ensure that enough energy can be produced due to good fuel conversion efficiency. However, variant ambient temperature does not quite affecting the BU fuel performances but do affect other biodiesel in terms of ignition delay and emission at low injection pressure. [ABSTRACT FROM AUTHOR]