A 4 stroke spark ignition engine operates on an ideal Otto cycle with acompression ratio of 8.5. This engine compresses the fresh air-fuel mixture20°C prior to the compression stroke. Temperature at the end of isentropicexpansion is 750K. Make air standard assumption to solve this problem. Airfrom its initial volume to a final volume of 75cm. The air is at 101kPa andproperties: Cp = 1.005KJ/kg.K; cy = 0.718KJ/kg.K; R = 0.287KJ/kg.K. (reter tothe P-V diagram shown in first question.)Determine.• Temperature at the end of intake stroke (process 1 to 2) in Kelvins (T2).• Heat supplied (Qm )in KI (answer in 3DP)• Thermal efficiency of the Otto cycle (in %)IsentropicIsentropicBDCTDC

Answered: Image /qna-images/answer/71229720-0f9f-4fd6-a1a4-175f0d43917f.jpg

Answered: compression ratio of 8.5. This engine…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Required information An air-standard Diesel cycle has a compression ratio of 18.2. Air is at 120°F and 14.7 psia at the beginning of the compression process and at 3250 R at the end of the heat addition process. Account for the variation of specific heats with temperature. Use data from tables. Determine the heat rejection per unit mass. (You must provide an answer before moving on to the next part.) The heat rejection per unit mass is 173.693 Btu/lbm.
25. An SI engine operates on an air-standard four-stroke Otto cycle with turbocharging. Air-fuel enters the cylinders at 70°C and compression ratio rk = 8. Calculate the work input during compression stroke. a. -319.4321kJ/kg b. -319.4322kJ/kg c. -319.4323KJ/kg d. -319.4324kJ/kg
please send handwritten solution Q2 part b
please send handwritten solution Q2 part a
The cylinder of an Ideal Dual Combustion Cycle,, with a pressure ratio of 2, has a bore of 7 inches and a stroke of 7.5 inches. The 4-stroke, 4-cylinder engine operates at 6000 rpm having a compression ratio of 21 and a cut-off ratio of 1.34. Air enters with a temperature and pressure of 67°F and 15 psi. Determine the following:a. Pressure & Temperature at each state.b. Power output of the engine (hp).c. Thermal Efficiency.
A constant pressure fuel-air cycle of a compression ratio of (18). The ambient conditions are (1.0 bar) and (27 °C). The engine is running on C,H₁, which burned with 120% theoretical of air, the residual gas fraction is (4%). If the pressure at the end of expansion stroke is 4.5 bar and the exhaust temperature is (1200 K), calculate the cut-off ratio and thermal efficiency of the cycle if the lower calorific value is (42000 kJ/kg). Assume Cpp for products is (1.135 kJ/kg.K) and (M₁ = 30), for reactants MR will be calculated from chemical equation. P₂ P4 P₁ Qin Suction V₂ 3 V3 Exhaust Isentropic V₁ Qout
ces ! Required information A four-cylinder, four-stroke, spark-ignition engine operates on the ideal Otto cycle with a compression ratio of 11 and a total displacement volume of 1.8 L. The air is at 90 kPa and 50°C at the beginning of the compression process. The heat input is 1.1 kJ per cycle per cylinder. The gas constant of air is R = 0.287 kJ/kg-K and use constant specific heats with cv=0.821 kJ/kg-K, cp = 1.108 kJ/kg-K, and k= 1.35. Determine the maximum temperature and pressure that occur during the cycle. (You must provide an answer before moving on to the next part.) The maximum temperature during the cycle is The maximum pressure during the cycle is K. kPa.
17. A diesel engine working on an air standard cycle has a peak temperature of 1200K. If the compression ratio of the engine is 20 and that the air at the entrance condition has a temperature of 300C. Determine the efficiency of the cycle. a. 68.6990% b. 68.6998% c. 68.6989% d. 68.6986%
Hi cutie,
An Otto cycle with the air-standard assumptions (cv=0.717 kJ/kg.K and cp/cv=1.4) has a compression ratio of 10. Before the isentropic compression process, the air is at 1xx kPa, 15°C, and 5yy cm³. The heat transfer to the air per cycle is 1zz0 kJ/kg. The angular speed of the crankshaft for the four-stroke engine is 2xx0 revolutions per minute. Determine (a) the thermal (first law) efficiency, (b) the second law efficiency, (c) the net specific power output of the cycle (in kJ/kg) (d) the mean effective pressure (MEP), (e) the horse power (hp) of the engine Note: You must draw P-V and T-s charts and mark processes to have a score Xx=04, yy=54,zz=84
please provide full solution
How does the thermal efficiency of a real Spark Ignition engine compares to that for the air standard Otto cycle and what are the reasons for the difference ?

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