The temperature of a spark ignition engine operating according to the ideal Otto cycle is T1 = 325 K and pressure P1 = 98 kPa at the beginning of compression. The compression ratio is r = 6, H / Y = 15. The course volume of the cylinder is Vh = 624 cm3, and the number of revolutions is n = 3160 rpm. The lower calorific value of the fuel is 38.2 MJ / kg. Combustion efficiency is y = 0.76 and the number of cylinders is 6. C v = 716.5 J / kg K, R = 287.13 J / kg K. a) Find the thermodynamic coordinates of the cycle. b) Find the thermal efficiency and the indication power of the engine. c) Find the mass of gasoline the engine will use per hour.

The temperature of a spark ignition engine operating according to the ideal Otto cycle is T1 = 325 K and pressure P1 = 98 kPa at the beginning of compression. The compression ratio is r = 6, H / Y = 15. The course volume of the cylinder is Vh = 624 cm3, and the number of revolutions is n = 3160 rpm. The lower calorific value of the fuel is 38.2 MJ / kg. Combustion efficiency is y = 0.76 and the number of cylinders is 6. C v = 716.5 J / kg K, R = 287.13 J / kg K. a) Find the thermodynamic coordinates of the cycle. b) Find the thermal efficiency and the indication power of the engine. c) Find the mass of gasoline the engine will use per hour.

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter21: Heat And The First Law Of Thermodynamics

Section: Chapter Questions

Problem 76PQ

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