HMW-3 Combustion in a diesel engine is assumed to begin at TDC and proceed at constant pressure. The air/fuel ratio is 27/1, the calorific value of fuel is 43 MJ/kg, and the specific heat of combustion products is given by: Cv = 0.71 + 20x10-5 T where T is the combustion products temperature in K unit. The gas constant for these products is taken to be 0.287 kJ/kg K. If the compression ratio is 15/1, and the temperature at the end of compression is 870 K, find at what percentage of the stroke the combustion is completed.

HMW-3 Combustion in a diesel engine is assumed to begin at TDC and proceed at constant pressure. The air/fuel ratio is 27/1, the calorific value of fuel is 43 MJ/kg, and the specific heat of combustion products is given by: Cv = 0.71 + 20x10-5 T where T is the combustion products temperature in K unit. The gas constant for these products is taken to be 0.287 kJ/kg K. If the compression ratio is 15/1, and the temperature at the end of compression is 870 K, find at what percentage of the stroke the combustion is completed.

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

Similar questions

What is an internal combustion engines? Give the classification of internal combustion engines
A fuel oil C8H18 is used in an internal combustion engine and the Orsat analysis are as follows: CO2 = 12.8% ; O2 = 3.5%; CO = 0.2% and N2 = 83.5%. Determine the actual air-fuel ratio.
Q1. Propane (C3H8) gas enters a steady-flow adiabatic combustion chamber at 25°℃ and 1 atm. It is burned with 300 percent excess air that also enters at 25°C and 1 atm. Assuming complete combustion, determine (a) the temperature of the products, (b) the entropy generation, and (c) the reversible work and exergy destruction. Assume that To = 298 K and the products leave the combustion chamber at 1 atm pressure.
Question 4: A fire in a 4 m x 5 m compartment can be representative of a "medium" f-fire. This compartment has wood (with a moisture content of 12%) as fuel. The peak heat release rate to be achieved is 10 MW. Assuming the calorific value of dry wood is 16.7 MJ/kg, the fuel load (on floor area) is 30 kg/m2. Find the duration of the steady-state burning phase and the total duration of the fire buning due to dry wood.
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.
Write the general energy balance for any combustion process. Is my answer correct?
During the compression stroke of a certain gasoline engine, the pressure increases from 1.00 atm to 19.0 atm. The process is adiabatic and the air-fuel mixture behaves as a diatomic ideal gas. (a) By what factor does the volume change? Vfinal = Vinitial (b) By what factor does the temperature change? Tinal = Tinitial Assume the compression starts with 0.016 mole of gas at 28.5°C. (c) Find the value of Q that characterizes the process. (d) Find the value of AEnt that characterizes the process. (e) Find the value of W that characterizes the process.
Ethane, C2H6, burns to completion with 21% excess air. Determine (a) the chemical reaction describing the process, (b) the mass based air-fuel ratio, (c) the molar air- fuel ratio, and (d) equivalence ratio of the process.
Bottom part only please, Discuss why the petrol engine is irreversible in terms of entropy and work lost due to the spontaneous flow of heat resulting from finite temperature differences.
A cement truck with four-stroke diesel engine has 11 cylinders. The bore and stroke of each cylinder are 738 mm and 2,201 mm, respectively. The brake mean effective pressure of each cylinder is 1.46 MPa and the engine rotates at 100 rpm. The brake thermal efficiency of the engine is 33 %, the mechanical efficiency is 81 % and the net calorific value of the diesel is 36.3 MJ/kg. Determine the fuel consumtion in units with kg and hour to no decimal place. Insert the unit symbol.
Question 1: The PV diagram shown below applies to 2.1 moles of an ideal diatomic gas. (a) (b) Calculate temperature at all points Calculate the heat transferred along paths AB, BC, CD and, DA. (atm) 40 A D V (m') 0.01 0.05 Question 2: Consider an engine with efficiency of 25%. How much must the temperature of the hot reservoir increase, so that the efficiency increases to 50%. The temperature of the cold reservoir remains at 5°C