A diesel engine has a compression ratio of 14. The air-to-fuel ratio is 28 and the temperature at the end of the compression stroke is 800 K. Assuming that the combustion process takes place at constant pressure, calculate the ratio between cylinder volumes after and before the combustion process (cut-off ratio). Take cp = 1000+ 0.001T [J/kg.K], where T is the air temperature in K. Take the heating value of diesel to be 42.5 MJ/kg. The cut-off ratio: signment within 19

A diesel engine has a compression ratio of 14. The air-to-fuel ratio is 28 and the temperature at the end of the compression stroke is 800 K. Assuming that the combustion process takes place at constant pressure, calculate the ratio between cylinder volumes after and before the combustion process (cut-off ratio). Take cp = 1000+ 0.001T [J/kg.K], where T is the air temperature in K. Take the heating value of diesel to be 42.5 MJ/kg. The cut-off ratio: signment within 19

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

See similar textbooks

Related questions

Q: What is the compression ratio of an Otto cycle type engine having 20% clearance . What is the air…

A: (1) Write the given data. C=20%=0.20

Q: An SI engine operating on stoichiometric propane fuel burns 0.00005 kg of fuel in each cylinder…

Q: If the cut-off ratio increases for the same compression ratio,the efficiency of the diesel cycle is…

A: The third option (decreases) is correct.

Q: An SI engine operating on stoichiometric propane fuel burns 0.00005 kg of fuel in each cylinder…

Q: b) If one mole of air (rigid diatomic gas) is initially at 20 °C, is compressed and expanded 7- fold…

A: The initial temperature is The compression ratio is The number of moles of gas is .The heat…

Q: Cylinder conditions at the start of compression in a spark ignition engine operating at wide open…

A: Given:-P1=98 kpaT1=60°CθHv=43 kj/kgnc=96%A/F ratio=15.5compression ratio(r)=9.5:1To…

Q: The temperature at the beginning of the compression process of a cold air standard Otto Cycle with a…

A: Hello. Since your question has multiple sub-parts, we will solve first three sub-parts for you. If…

Q: The Ford Coyote 5.0 L V-8 engine has a bore (diameter) and stroke of 92.2 and 92.7 mm, respectively,…

Q: At the beginning of the compression process of an air standard Otto cycle, p1 =1 bar, T1 = 300 K.…

Q: Combustion in a diesel engine is assumed to begin at TDC and proceed at constant pressure. The…

Q: An Otto cycle engine installed in a road vehicle has a volume compression ratio of 6 and provides a…

A: Given data as per question Volume compression ratio = 6 Cp=1004 j/kg.k Cv = 717j/kg.k we know that

Q: Part 2 A compression ignition engine operates on a diesel cycle has a compression ratio of 20 and…

A: Dear student, According to the guidelines I am allowed to answer only three…

Q: If 50% of the energy produced in a combustion turbine goes into compressing the intake air, by what…

A: Draw the Block diagram for the initial given condition. The total energy E will be divided into two…

Q: Problem 2.2 A four-cylinder, four stroke petrol engine is to develop 40 kW at 40 rev/s, when it is…

A: The specific fuel consumption is, sfc = 83.9 g/MJ.

Concept explainers

IC engines

The term "engine" indicates a mechanical device/machine used to convert input energy to a specific mechanical output. The input energy may be in the form of chemical energy, thermal energy, or so on and mechanical output is in the form of mechanical energy (work done). Generally, the engines classify into two groups which are internal combustion type and external combustion type, and further, these two types can be classified into two types that are reciprocating and rotary engines.

Question

A diesel engine has a compression ratio of 14. The air-to-fuel ratio is 28 and the temperature at the end of the compression stroke is 800 K.
Assuming that the combustion process takes place at constant pressure, calculate the ratio between cylinder volumes after and before the
combustion process (cut-off ratio). Take cp = 1000+ 0.001T [J/kg.K], where T is the air temperature in K. Take the heating value of diesel to be
42.5 MJ/kg.
. The cut-off ratio:
to "Midterm Exam File Upload" assignment within 10

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

STEP 3 To review the efficiency of ideal heat engines operating on the Otto and Diesel cycles, you are asked to perform the following branches: • Provide general plot(s) for thermal efficiency, O vs compression ratio, r for ideal Otto and diesel engines and show the typical compressions ratios. Compare your plots in terms of the typical compression ratio values. • Using your plot of the thermal efficiency, O vs compression ratio, r for ideal diesel engine, show how will the thermal efficiency of the diesel engine, O would change with the cut-off ratio values. • Explain mathematically how the thermal efficiency, D of Otto cycle is always higher than diesel cycle if-and-only-if both engines are operated at the same compression ratio, D. • Based on your previous answer, indicate why we use diesel engines. • Conclude your results of step 3 in two sentences.
A CI engine operating on the air-standard Diesel cycle has cylinder conditions at the start of compression of 65C and 130 kPa. Light diesel fuel is used at an equivalence ratio of o > 0.8 with a combustion efficiency ne = 0.98. Compression ratio is rc = 19. Calculate: (a) Temperature at each state of the cycle. [0C] (b) Pressure at each state of the cycle. [kPa
Cylinder conditions at the start of compression in an SI engine operating at WOT on an air-standard Otto cycle are 60C 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. Calculate: (a) Temperature at all states in the cycle. [0C] (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. [%] 2
A compression ignition engine operates on a diesel cycle has a compression ratio of 20 and uses air as the working fluid. The air at the beginning of the compression process is at 100 kPa and 30 C. If the maximum temperature of the cycle is 2000 °C. Under cold air standard assumptions at room temperature. Task 1 a. Describe with the aid of diagrams the operational sequence of four stroke compression ignition engines. b. Explain the mechanical efficiency for an ideal diesel cycle of two and four stroke engines c. Explain the relationship between thermal efficiency (n), compression ratio (r), and cut-off ratio (rc).
(a) Derive an expression for the air standard efficiency of a Brayton cycle in terms of pressure ratio. (b) An engine working on Diesel cycle has a compression ratio of 15 and fuel supply is cut off at 8% of stroke. If the engine has a relative efficiency of 50%, determine the fuel consumption per kW-hr. Assume the fuel has a calorific value of 42000 kJ/kg.
Consider a CI engine with a fuel injector mounted at the center of the cylinder head. The bore of the engine is 10 cm. The injector has a nozzle diameter of 0.05 mm and a discharge coefficient of 0.65. The fuel injection pressure is 600 bar. If the average cylinder pressure during injection is 50 bar and the density of the fuel is 800 kg/m3, estimate the time for a fuel particle to reach the cylinder wall.
Determine the mean effective pressure in kPa of a certain air -standard Diesel cycle which has a compression ratio of 16 and a cutoff ratio of 2. At the beginning of the compression process, the pressure and temperature of air is at 95,000 Pa and 300K, respectively. Roun-off your answer into two decimal places. hint: Linear Interpolation equation Y1 - Yo Yo (21 – æ) + Y1 (x – xo) | y = Yo + (x – co): *1 - 20 |
A Volkswagen Passat has a six-cylinder Otto-cycle engine with compression ratio r = 10.6. The diameter of each cylinder, called the bore of the engine, is 82.5 mm. The distance that the piston moves during the compression, called the stroke, is 86.4 mm. The initial pressure of the air-fuel mixture is 8.50 x 104 Pa, and the initial temperature is 300 K (the same as the outside air). Assume that 200 J of heat is added to each cylinder in each cycle by the burning gasoline, and that the gas has Cv = 20.5 J/mol K and y=1.40. Calculate the total work done in one cycle in each cylinder of the engine, and the heat released when the gas is cooled to the temperature of the outside air.
If one mole of air (rigid diatomic gas) is initially at 20 ◦C, is compressed and expanded 7-fold as part of the Diesel cycle, and 4 kJ of heat is generated as a result of the fuel injectionand combustion, calculate: (i) the temperature after each stage of the Diesel cycle; (ii) the heat absorbed/expelled during each stage of the cycle; and (iii) the efficiency of the Diesel cycle.
Determine the ideal and actual work into the compression process for agasoline engine with an isentropic efficiency of 75% and a compression ratio of 12.The inlet temperature and pressure are 300 [K] and 100 [kPa] respectively.
If one mole of air/fuel mixture (rigid diatomic gas) is initially at 20◦C, is compressed and expanded 7-fold as part of the Otto cycle, and 4 kJ of heat is generated by burning the air/fuel mixture, calculate: (i) the temperature after each stage of the Otto cycle; (ii) the heat absorbed/expelled during each stage of the cycle; and (iii) the efficiency of the Otto cycle.
A diesel engine operating on the air-standard Diesel cycle has six cylinders of 100 mm bore and 120 mm stroke. The engine speed is 1800 rpm. At the beginning of compression, the pressure and temperature of air are 1.030bar and 35°C. If the clearance volume is 1/8th of the stroke volume, calculate (i) the pressure and temperature at the salient points of the cycle (ii)the compression ratio (iii) the efficiency of the cycle and (iv) the power output if the air is heated to 1500'C. Assume C, and C of air to be 1.004 and 0.717 kJ/kg K respectively.