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(Solved): A Toyota 1NR-FE engine as shown in Figure Q2b has four-stroke SI engine with four-cylinder and oth ...
A Toyota 1NR-FE engine as shown in Figure Q2b has four-stroke SI engine with four-cylinder and other detail as below. Figure Q2b : Toyota 1NR-FE engine - Bore and stroke . - Brake power is at speed of rotation of - Compression ratio is 11.5 - The engine has gravimetric air-fuel ratio, AFR is 14.7 - Volumetric efficiency is - mechanical efficiency is
Take the ambient pressure and temperature of air intake conditions are and , respectively. The calorific value of the fuel is and isentropic compression index is 1.4 Determine, i. Otto thermal Efficiency ii. Brake mean effective pressure (bmep) iii. Indicated mean effective pressure (imep) iv. SFC in v. Brake thermal efficiency,
Expert Answer
Total swept volume of all four-cylinder isK=number of cylinder, D= bore, L=stroke, N= rpm of enginedensity of air entering is , by ideal gag equation at entering of cylinderwhere gas characteristic constant for air is = 0.287 KJ/kg-Kvolumetric efficiency= actual volume entering/ theoritical swept volumeactual mass entering of air ma=density of air * actual volume of airma=1.1499*0.059818mass of air ma= 0.0687947 kg/sGiven, AFR=14.7= (mass of air)/(mass of fuel)we know the result of , air standard efficiency of Otto cycle k= compression and expansion index,r= compression ratio.this is cold air standard otto cycle efficiency