MENG Assn 6 Gasoline Engine.docx

MENG Assn 6 Gasoline Engine.docx - Ryan Herbin MENG-206...

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Ryan Herbin MENG-206 Spring 2012 Assignment # 6 Gasoline Engine April 2 nd , 2012
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1. What is the difference between the IC engine and the other group of heat engines? List two applications and reasons for the adoption of the IC engine. The internal combustion (IC) engine is a heat engine in which the chemical energy of combustion is released inside the engine cylinder. In the other group of heat engines – steam engines – the energy developed during combustion of a fuel is transmitted first to steam, which makes the engine work. One of the outstanding applications is in the field of transportation. In many small and medium sizes stationary plants, on farms and in small industrial enterprises, simplicity and low cost of operation are the determining factors in the adoption of IC engines. 2. What are the four assumptions made for the analysis of the standard cycle? 1. The properties of the working substance can be calculated by the application of the characteristic equation for a perfect gas. Its behavior can be studied by the equation: pV=mRT. Where m = mass in kg. R = 29.27 kgf-m/kg°K for air (gas constant) P = pressure in kgf/cm 2 V = volume in m 3 T = temperature in °K 2. The specific heat of the substance remains the same during all of the processes in the cycle, i.e. C p and C v remain unchanged at all pressures and temperatures met with in the various process of a cycle. Thus, the internal energy of a unit mass of gas at any point can be given as u = C v T Where the base temperature is chosen as zero degree absolute. Similarly, enthalpy, h, of a unit mass be written as h = C p T The values of specific heat for air at room temperature are C v =0.171 kcal/kg°K C p =0.24 kcal/kg°K 3. The cycle is composed of reversible process and thus work quantities during various process are given by pdv for non –flow processes and - vdp for flow processes. 4. The gas does not undergo any chemical changes, the addition of heat from an outside source and removal of heat to an outside sink is simple heat transfer.
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