During the power stroke in a four-stroke automobile engine, the piston is forced down as the mixture of combustion pro ducts and air undergoes an adiabatic expansion. Assume: (1) the engine is running at 3,000 cycles/min; (2) the gauge pressure immediately before the expansion is 18.75 atm (3) the volumes of the mixtu re immediately before and after the expansion are 40.0 cm' and 320 cm', respectively (4) the time interval for the expansion is one-fourth that of the total cycle (5) the mixtu re behaves like an ideal gas with specific heat ratio 1.40.
During the power stroke in a four-stroke automobile engine, the piston is forced down as the mixture of combustion pro ducts and air undergoes an adiabatic expansion. Assume: (1) the engine is running at 3,000 cycles/min; (2) the gauge pressure immediately before the expansion is 18.75 atm (3) the volumes of the mixtu re immediately before and after the expansion are 40.0 cm' and 320 cm', respectively (4) the time interval for the expansion is one-fourth that of the total cycle (5) the mixtu re behaves like an ideal gas with specific heat ratio 1.40.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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During the power stroke in a four-stroke automobile engine, the piston is forced down as
the mixture of combustion products and air undergoes an adiabatic expansion.
Assume:
(1) the engine is running at 3,000 cycles/min;
(2) the gauge pressure immediately before the expansion is 18.75 atm
(3) the volumes of the mixtu re immediately before and after the expansion are 40.0
cm and 320 cm', respectively
(4) the time interval for the expansion is one-fourth that of the total cycle
(5) the mixture behaves like an ideal gas with specific heat ratio 1.40.
Find the average power generated during the power stroke.
Expert Solution
Step 1
Given data:
Engine is running at 3000cycles/min
Gauge pressure before expansion=18.75atm
Initial volume=40cm3
Final volume=320cm3
Time involved in the expansion is one-fourth of the total cycle.
Specific heat ratio=1.4
We need to calculate the average power generated.
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