Design of Automotive Engines by Kolchin-Demidov PDF

By Kolchin-Demidov

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50MPaand T,=700 to 900 K With supercharged diesel engines the values of p , and T c rise, depending on the extent of supercharging. 6 within the temperature range 0-1500°C. The mean molar specific heat of residual gases a t the 58 PART ONE. 8 for a diesel fuel. 6 within the temperature range 0-1500°C. The mean molar specific heat of working mixture (fresh mixture+ residual gases) is determined by the equation (mck2)e):r fMivr (mcbN,)frf ~ 0 lllfter the computations are made and the parameters of point c are determined, the compression line is roughly corrected with a view to taking into consideration the start of combustion.

5), the combustion equations are solvable for t , by the successive approximation method (selection of t ,). 6), the combustion equations take the form of a quadratic equation after substituting in them numerical values for all known parameters and subse- PART ONE. WORKING PROCESSES AND CHARACTERISTICS 62 quent transformations At: + Bt, - C = 0 where A , B, and C are numerical values of known quantities. B2 ~ A C ) / ( ~ A"C) ,and T,= t , $273 K + + Defining the value of pressure p , a t the end of combustion is dependent on the nature of the cycle being accomplished.

As this happens, the pressure a t the end of compression roughly rises to pc. = = 1 5 - 2 5 )p (point c"). 3. COMBUSTION PROCESS The combustion process is the principal process of the engine working cycle during which the heat produced by fuel combustion is utilized to enhance the internal energy of the working medium and to perform mechanical work. FOP pressure variation during the fuel combustion process i n a carburettor spark-ignition engine, see Fig. 5 and in a diesel engine, Fig. 6. The curves clfc"z, schematically show actual pressure ariat ti on in the engine cylinders during the combustion process.

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Design of Automotive Engines by Kolchin-Demidov


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