Bio fuels based on vegetable oils offer the advantage being a sustainable, annually renewable source of automobile fuel. Despite years of improvement attempts, the key issue in using vegetable oil-based fuels is oxidation stability, stoichiometric point, bio-fuel composition, antioxidants on the degradation and much oxygen with comparing to diesel gas oil. Thus, the improvement of emissions exhausted from diesel engines fueled by biodiesel derived from palm oil is urgently required to meet the future stringent emission regulations. Purpose of this study is to explore how significant the effects of palm oil blending ratio on combustion process that strongly affects the vehicles performance and exhaust emissions. The engine speed was varied from 15003000 rpm, load test condition varied by Dynapack chassis dynamometer from 050% and palm oil blending ratio from 515vol% (B5B15). Increased blends of biodiesel ratio is found to enhance the combustion process, resulting in decreased the HC emissions with nearly equal of engine performance. The improvement of combustion process is expected to be strongly influenced by oxygenated fuel in biodiesel content.
A spoiler is an aerodynamic component used to decrease drag in automobiles. The primary function of the car rear spoiler is to increase the vehicle’s grip on the road by decreasing the aerodynamic drag and increase stability. This rear positioned device built up an area of high pressure to replace the low pressure on the trunk leading to increased stability. The objective of this study is to investigate the effects of rear spoiler on automobile aerodynamic drag and stability in compliance with the Malaysian National Speed Limit. Both the sedan vehicle model and the rear spoiler models were built using CAD (Computer-Aided Design) software. The data was then analyzed in CFD (Computational Fluid Dynamic) software to calculate the drag and lift force acting on the moving sedan car at velocity of 60km/h, 90km/h and 110 km/h. There have been some limitations due to the complexity of the design. Two rear spoiler designs which are the ducktail spoiler and the rear wing were used in the simulation along with the sedan vehicle. The result given by the simulations shows that rear spoilers increase the drag force and the downforce of the car. Rear wing shows a drastic increase in drag and downforce while ducktail spoiler shows a slight increase. The result also shows that slow moving vehicle has higher drag than fast moving vehicle. In summary, spoilers increase drag at low speed and only shows its benefits at high speed. Given the Malaysia National Speed Limit, spoilers may only show its benefit when the vehicle is driven on the expressway since expressways has a speed limit of 110 km/h.
Rear-end collisions are one of the highest contributors to road accidents fatalities, especially motorcycles which made up to 60% of the total of accidents that occur. The reasons that trigger such accidents are careless, dangerous turning (lane splitting and weaving between vehicles) and speeding, thus causing the awareness of the following vehicles to decline. That is why this study is conducted to find out the effectiveness of flashing brake lamps compared to conventional brake lamps on motorcycles. The experiment involves the driving experience, the distance between vehicles and gender as the factors that affect the brake response time (BRT) on brake lamps. The data collected are analysed and the findings showed that driving experience can influence the BRT, where experienced drivers have faster BRT (0.575 s) compared to others, however, beginner drivers demonstrate the highest BRT reduction by 13.4% (0.123 s). The analysis of the BRT based on the distance between vehicles displayed the driver’s adaptation to flashing brake lamps. The 10 m distance has the highest BRT reduction among other distances by 18.09% (0.142 s) even though the 6 m and 8 m distances presented a quite small BRT reduction, only around 0.04 s. Gender also illustrated the biggest impact of BRT on brake lamps, where males seem to be quicker to respond than females by 23.51% and 28.62% for conventional and flashing lamps respectively. As a whole, the flashing lamps portrayed shorter BRT than the conventional lamps by 9.87% (0.074 s). thus, it is suggested that flashing brake lamps is proven to reduce the BRT of the rear drivers and are suitable for implementation on motorcycles. Therefore, this study will benefit the future improvement and increase the conspicuity of motorcycle brake lamps.
Biodiesel is the alternate fuel which is derived from renewable sources either is vegetable oils or animal fats. For that reason, the vehicle run by Bio-diesel Fuel (BDF) has been a potential option and the alternative sources of fuel are receiving a lot attention in the automotive industry. The use waste cooking oil (WCO) biodiesel as an alternative fuel in engines has advantages from both economic and the emissions of carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas. Purpose of this study is to investigate the effects of waste cooking oil blended fuel, engine speed and test load conditions on the fuel properties, combustion characteristics and engine performance. The engine speed was varied from 1500 to 3000 rpm, load test condition varied by dynapack chassis dynamometer in 0, 50 and 100% and blends of 5(WCO5), 10(WCO10) and 15vol%(WCO15) waste cooking oil with the diesel fuel. The results showed that the use of WCO as biodiesel results in a higher fuel consumption rate, especially at low engine speed and full load condition.
This paper reviews the effects of premix fluids between biodiesel, air, and water for external combustion especially open burner. During burning process, biodiesel combustion involves the fuel-air mixing characteristic such as oxidation stability, stoichiometric point, bio-fuel composition, antioxidants and viscosity that influences more NOx emissions than diesel fuel. The strategies to reduce NOx emission are acquired with water additional in biodiesel fuel mixing during early stage of burning process. The method to mix biodiesel-water with injector was acquired in burner system. A vast majority of author reported that the variation in mixing of blending biodiesel ratio and water was found to enhance the burning process and mixture formation thus predominantly reducing the NOx emissions.
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