Question
An in-line six-cylinder, 2 liter SI engine using gasoline with QHV = 43,400 kJ/kg fuel at an air-fuel ratio of AF = 21 operates
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An in-line six-cylinder, 2 liter SI engine using gasoline with QHV = 43,400 kJ/kg fuel at an air-fuel ratio of AF = 21 operates on an air-standard Otto cycle. Combustion can be assumed to occur with a combustion efficiency n=100% Cylinder conditions at the start of compression are 60C and 101kPa. Compression ratio r = 10:1. Assume y = 1.35 and R = 0.287 kJ/kg.K, when analyzing the cycle by hand. Assume the overall mechanical efficiency is 85%. For hand calculations to compare to your code, consider N=4000 RPM. Other parameters you will need for detailed calculations (but not for the hand calculations): The engine is square, B = L connecting rod length is L.=0.16m Ambient conditions are T-20C, P=1atm=101.325 kPa Block head and piston crown are flat (they have the area of a circle) Coolant temperature is constant at 85C. There are 2 intake and 2 exhaust valves Valves are sized for Nmax-8000 RPM with an gas temperature of 600C The intake is one long, circular pipe with an aspect ratio of L/D=1000 and a diameter equal to the bore of 1 piston The scaled intake wall roughness is /D=0.01 Valve discharge coefficient is C,-0.6 Calculate: a) Temperature and pressure at each state of the cycle b) Indicated compression and expansion work c) Net indicated work d) Indicated mean effective pressure e) Heat added during combustion f) Indicated thermal efficiency g) fuel mass flow rate h) Indicated specific fuel consumption i) Indicated Torque j) Indicated Power k) Brake torque 1) Brake power m) Brake mean effective pressure n) Brake specific fuel consumption
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