# At the end of the constant-volume combustion process, the gas temperature is 4000 K. Calculate the gas pressure at the end of the constant-volume combustion.

In the four-stroke, reciprocating, internal combustion engine that powers most automobiles as well as most small general aviation aircraft, combustion of the fuel- air mixture takes place in the volume b> the top of the piston and the top of the cylinder. (Reciprocating engines are discussed . 9.) The gas mixture is ignited when the piston is essentially at the end of the compression stroke (called top dead center), when the gas is compressed to a relatively high pressure and is squeezed into the smallest volume that exists between the top of the piston and the top of the cylinder. Combustion takes place rapidly b> the piston has much time to start down on the power stroke. Hence, the volume of the gas during combustion stays constant; that is, the combustion process is at co71Stant volume. Consider the case where the gas density and temperature at the instant combustion b> are 11.3 kg/m3 and 625 K, respectively. At the end of the constant-volume combustion process, the gas temperature is 4000 K. Calculate the gas pressure at the end of the constant-volume combustion. Assume that the specific gas constant for the fuel-air mixture is the same as that for pure air.

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