An engine operates on the theoretical diesel cycle with a compression ratio of 14. The heat addition process corresponds to 7% of thestroke. The pressure and temperature of air at the beginning of compression, are 100 Kpa and 20°C (293 k).Given: y=1.4, Cp-air= 1.005 kJ/kgK, Cv-air-0.718 kJ/kgK, R-air-0.287 kJ/kgkCalculate the cut-off ratioThe thermal efficiency isChoose...Choose...The temperature at the end of the heat addition process is (13) Choose...the work of the cycle isO÷Choose... O

Diesel Cycle: Compression ratio: r= 1.4 CP=1.005 kJ/kg.K CV=0.718 kJ/kg.K R=0.287 kJ/kg.K…

Answered: An engine operates on the theoretical…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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1. An engine operates on the air-standard diesel cycle. The condition at the start of compression are 27 degree celsius and 100kPa. The heat supplied is 1840kJ/kg, and the compression ratio is 16. Determine the maximum temperature and pressure, the thermal efficiency and the mean effective pressure. 2. Calculate the bore and stroke of a six-cylinder engine that delivers 22.4 kW at 1800 rpm with a ratio of bore to stroke of 0.71. Assume the mean effective pressure in the cylinder is 620 kPa and the mechanical efficiency is 85%. 3. A spark-ignition engine produce 224 kW whle using 0.0169 kg/s of fuel. The fuel has a higher heating value of 44 186 kJ/kg, and the engine has a compression ratio of 8. The friction power is found to be 22.4 kW. Determine the brake thermal efficiency, mechanical efficiency,and the rest of the efficiencies.
A 4-litre 4-cylinder air-standard Otto cycle engine works on benzene fuel at an air-fuel ratio of 15.The compression ratio of the engine is 10. At the start of the compression stroke, conditions in the cylinders are 60°C and 100 KPa. the benzene low heating value is 41800 KJ/kg Calculate: 1. Temperature and pressure at each state of the cycle, Indicated thermal efficiency, Residual gas temperature after blow down and ambient temperature 2.plot the PV diagram of this cycle and If this engine is operating on the dual cycle, will the efficiency be larger or smaller than the diesel cycle?
An ideal dual cycle internal combustion engine has a compression ratio of 13, a cutoff ratio of 1.2, and a pressure ratio of 1.3. The cycle takes in air at 313K and 40OkPa. Utilizing the cold air standard assumptions and assume the following properties of air stay constant throughout the cycle: Cp=1.005 kJ/(kg•K), cv=0.718 kJ/(kg•K), R=0.287 kJ/(kg•K), and k=1.4. Determine the following: a.) The maximum pressure of the cycle b.) The maximum temperature of the cycle c.) The amount of heat added d.) The thermal efficiency of the cycle P 3 qin 4 Jout 1
Cylinder conditions at the start of compression in a spark ignition engine operating atwide open throttle on an air-standard Otto cycle are 60oC and 98kPa.The engine has a compression ratio of 9.5:1 and uses petroleum with an air-fuel ratio(AF) of 15.5.Combustion efficiency is 96%, and it can be assumed that there is no exhaust residual.If the petroleum has a heating value (QHV) of 43kJ/kg,Calculate the following: 1) Temperature in oC and Pressure in kPa at all states in the cycle 2) Specific work done during the power stroke in kJ/kg 3) Heat added during combustion in kJ/kg 4) Net specific work done in kJ/kg5) Indicated thermal efficiency
on the ideal dual-Combustion Q6) In an engine working cycle, the temperature and pressure at the beginning of Compression are 100°℃ and loo kpa respectively. The Gomperssion ratio is 10:1. If the maximum Pressure is limited to 7000 kPa and 1.675 kJ of heat is supplied Per kg of airs determine the temperature at salient (key) Points of the cycle and the air standard efficiency. of the engine. Assume CP=1.0035 kJ/kg.k, Cu= 0.71 65 kJ/kg. k
1. Cylinder conditions at the start of compression in an SI engine operating at WOT on an air-standard Otto cycle are 60°C and 98 kPa. The engine has a compression ratio of 9.5:1 and uses gasoline with AF = 15.5. Combustion efficiency is 96%, and it can be assumed that there is no exhaust residual. Heating value of the fuel is about 44MJ/kg. Calculate: (a) Temperature at all states in the cycle. [°C] (b) Pressure at all states in the cycle. [kpa] (c) Specific work done during power stroke. [kJ/kg] (d) Heat added during combustion. [kJ/kg] (e) Net specific work done. [kJ/kg] (f) Indicated thermal efficiency. [%]
Calculate the efficiency of an Diesel cycle assuming Cold Air-Standard Analysis operating in air (k= 1.4) with a compression ratio of 20 and a cutoff ratio of 1.7? (Enter your answer as a percent to the nearest 1/10th)
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The pressure and temperature at the beginning of compression of an air-standard Diesel cycle are 80 kPa and 300 K, respectively. At the end of the heat addition, the pressure is 6821 kPa and the temperature is 2050 K. Step 1 Your answer is correct. Determine the compression ratio. r = 25.36 Hint Attempts: 1 of 3 used Step 2 Determine the cutoff ratio. ľc= i Attempts: 0 of 3 used Submit Answer Save for Later Step 3 The parts of this question must be completed in order. This part will be available when you complete the part above.
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. Theengine 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.
An air standard diesel cycle operates at a maximum temperature and pressure of 3000 K and 8500 kPa. The air’s condition before entering compression stroke is 100 kPa at 300 K. a. Draw the cycle’s P-V and T-S diagrams (use state points 1-2-3-4 in order).b. Identify all unknown temperatures (K) and pressures (kPa) at 4 state points.c. Determine the compression ratio and cut-off ratio of the engine.d. Calculate the cycle’s thermal efficiency.e. What is the cycle’s mean effective pressure (kPa)?
1. Cylinder conditions at the start of compression of a four-stroke cycle SIO engine are 27C and 100 kPa. The engine has a compression ratio of = 6:1, and heat addition from combustion is qin = 2400 kJ/kg. Calculate: Temperature at each state of the cycle, using air-standard Otto cycle analysis with constant specifics heats. 2. A gasoline engine has a volumetric has a volumetric compression ratio of 10 and before compression has air at 290 K, 85 kPa, in the cylinder. The combustion peak pressure is 6000 kPa. Assume cold air properties. What is the highest temperature in the cycle? Find the temperature at the beginning of the exhaust (heat rejection) and the overall cycle efficiency. 3. A supercharged spark-ignition engine operates on the air-standard Otto cycle. The inlet conditions are 210kPa and 100°C and the maximum temperature and pressure are 2250°C and 7.5MPA. Determine (a) the network; (b) the cycle efficiency. (use k=1.4)

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