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Topic: Combustion Basics-Reaction Equations Introduction: In this problem we will study the combustion of gasoline, which we will model as isooctane CsH1s and with heating value of 18,600 BtuIbm. We will assume complete combustion whenever 100% or more theoretical air is available. When less than 100% theoretical air is available, the fuel will be converted to incomplete combustion products. Co, C, and H2. The available oxygen will be used to partially convert the fuel with first priority to convert hydrogen to water. Second priority will be to convert carbon to carbon monoxide, and next to carbon dioxide* For example, if 4.5 moles of oxygen (Oa) are available for I mole of gasoline, the fuel will become 9 moles of water H20) and8 moles of elemental carbon (C). If8.5 moles of oxygen are available, then fuel will become 9 moles of water H20)and 8 moles ofcarbon monoxide (CO). Problem #1: efficiency the AFR for the manufacturer's stated peak power output assuming constant engine efficiency Based on the engine calculate: a) the AFR for cruising condition 60 mph b) Problem #2: write a balance reaction equation based on one mole of gasoline for: a) AFR at cruising condition, b) AFR at peak power output condition Ford V8 5.0L Vi-VTC Engine We must first develop a model for the forces acting on the vehicle. We will assume the total force is the sum of the aerodynamic drag, and rolling resistance using the following values: Cruising Speed: Crankshaft Speed: Drag Coefficient (CD): Frontal Area (A): Vehicle Weight: Coef. Of Rolling Friction (u): Mechanical Transmission Efficiency 60 miles per hour 1800 RPM 0.39 35.1 f 6,000 lbr 0.02 95% engine efficiency Efficiency = 135.1/305 = 44.3%

Answer 1

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