The following data is given for a four-stroke diesel engine: Cylinder bore = 250 mm, Length of stroke = 300 mm,Speed 600 rpm, Indicated mean effective pressure = 0.6 Mpa, Mechanical efficiency = 80%Maximum gas pressure = 4 Mpa, Fuel consumption = 0.25 kg per BP per hHigher calorific value of fuel = 44 000 kJ/kg, Assume that 5% of the total heat developed in the cylinder istransmitted by the piston. The piston is made grey cast iron FG 200 (Sut = 200 N/mm² and k = 46.6 W/m/°C)and the factor of safety is 5.The temperature difference between the centre and the edge of the piston head is 220°C.(i) Calculate the thickness of piston head by strength consideration.(ii) Calculate the thickness of piston head by thermal consideration.(iii) Which criterion decides the thickness of piston head?(iv) State whether the ribs are required.(v) If so, calculate the number and thickness of piston ribs.(vi) State whether a cup is required in the top of the piston head.(vii) If so, calculate the radius of the cup.

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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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At this speed, the volumetric efficiency of the engine is 92%, Apa 0.07 bar, C, 0.85, C = 2. A four-stroke, 6-eylinder, 3.6 Itr SI engine, is designed to have a maximum speed of 6000 F-p. a 0.6, fuel density = 700 kg/m'. At sea level the air temperature and pressure are 27°C and 1 bar réspectively, and AF 15. Caleulate: (i) Throat diameter of the carburetor. (i1) Fuel ome !! area. (iii) AF at altitude of 3000 m.
(e) Calculate the angular velocity of the gas mixture sing paddle wheel model of two- cylinder engine by assuming swirl ratio is 11. Use the following data: i. air to fuel ratio 8.8 ii. compressiom ratio-7.2 ii, volunetric efficiency77 iv. indicated thermal efficiency 33 v. mechanical efficiency55 vi. brake power 62000 j/sec vii. engine volmne 1000 cm3 vi. calorific value 45000 kj/m
2. A four-cylinder 2.5 L spark-ignited engine is mounted on a dyno and operated at a speed of W=3000 rpm. The engine has a compression ratio of 10:1 and mass air--fuel ratio of 15:1. The inlet air manifold conditions are 80 kPa and 313 K. The engine produces a torque of 160 Nm and has a volumetric efficiency of 0.82. (a) What is the brake power Wb (kW)? (b) What is the brake specific fuel consumption bsfc (g/kWh)?
The Fifth Question: A six-cylinder, 4-stroke petrol engine develops 62 H.P at 3000 r.p.m. The volumetric efficiency at N.T.P. is 85%. The bore is equal to the stroke and thermal efficiency of 25 % may be assumed. Calorific value of petrol is 44100 kj/kg. Air-fuel ratio is to be 15:1. Calculate the cylinder bore and stroke.
The following data is given for a four-stroke diesel engine: Cylinder bore = 250 mm, Length of stroke = 300 mm, Speed = 600 rpm, Indicated mean effective pressure = 0.6 Mpa, Mechanical efficiency 80% Maximum gas pressure = 4 Mpa, Fuel consumption = 0.25 kg per BP per h Higher calorific value of fuel = 44 000 kJ/kg, Assume that 5% of the total heat developed in the cylinder is transmitted by the piston. The piston is made of grey cast iron FG 200 (Sut = 200 N/mm² and k = 46.6 W/m/°C) and the factor of safety is 5. The temperature difference between the centre and the edge of the piston head is 220°C. () Calculate the thickness of piston head by strength consideration. (i) Calculate the thickness of piston head by thermal consideration. (ii) Which criterion decides the thickness of piston head? (iv) State whether the ribs are required. (v) If so, calculate the number and thickness of piston ribs. (vi) State whether a cup is required in the top of the piston head. (vii) If so, calculate…
A crawler with 1.5 m diesel engine has the following information: Cost of equipment Shipping cost Unkoading &assembling at destination Engine Crankcase capacity 1lours between oil changes Operating factor Useful life, with no salvage value Hours operated per year Weight Cost of fuel per liter Cost of oil per liter Maintenance $82260 $2448 $220 160 hp 22.71 liter 100 hr 06 6 vears 2000 61700 kg 0.33 $/liter 0.53 S/liter 100% of Depreciation 12% of Average Valuc Investment 1- what is the initial capital cost of the crawler?
COMBUSTION ENGINEERING In an air-standard Otto cycle engine, the following data were obtained: k = 1.4 , C, = 1.0045 ,C, = 0.7175 , P1 = 103 kPa , t, = 26°C, t2 = 414°C, tz = 2527°C, kgK kg-K t4 = 945.8°C. To be done: a. Find the compression ratio r. A. 6,5 В. 7 C. 7.5 D. 8.0 E. None of these b. Find the pressure at the end of the compression stroke p2. А. 1804 КРа В. 1894 КРа С. 1994 КPа D. 2004 КРа c. Find the pressure at the end of heat addition. A. 7700 kPa B. 7719 kPa C. 8019 kPa D. 8800 kPa E. None of these d. Find the pressure at the end of the expansion stroke P4. A. 410 kPa В. 420 kPa C. 8019 kPa D. 460 kPa E. None of these e. Find the Heat added qa to the cycle, in kJ/kg air. A. 1615 kJ/kg C. 1555 kJ/kg E. None of these B. 1575 kJ/kg D. 1516 kJ/kg f. Find the work of the cycle wey, in kJ/kg air. A. 866.1- kg air B. 877.1 k) kg air C. 880.2- D. 900- E. None of these kg air E. None of these kg air Page 1 of 2 g. Calculate the cycle efficiency for the cycle, in percent. A. Ncy =…
2.) A four-cylinder, two-stroke cycle diesel engine with 10.9 cm bore and 12.6 cm stroke produces 88 kW of brake power at 2000 RPM. Compression ratio rc = %3D 18:1. (a) engine displacement in cm³, (b) brake mean effective pressure in kPa, (c) torque in N-m, (d) clearance volume of one cylinder in cm³.
Engine Type: Single cylinder Four stroke Diesel engine, Bore: 0.0875m, Stroke: 0.11m Capacity: 661.5 cc, Power: 6 H.P. at 1500 rpm, Torque: 2.96 kg.m at 1500 rpm and Compression Ratio :17.5:1 Explain how to measure the :- Fuel consumption. Inclined manometer readings for air flow. RPM, power output etc. (iv) Study of various components of diesel engine. (ii)
1- A four-cylinder, two stroke cycle diesel engine with (10.9 cm) bore and (12.6 cm) stroke produces (88 kW) of brake power at (2000 RPM). Compression ratio is (18:1). Determine: (a) Engine displacement. Ans.: (4700.6 cm³). (b) Brake mean effective pressure. Ans.: (561.7 kPa).
In a laboratory test of a 4-stroke engine with Vd = 3.05 liters at N = 3000 RPM the following performance data are measured: net IMEP 107.9 lbf/in2 , 70.32 brake horsepower, fuel flow rate 16.66 kg/hr., air flow rate 269.6 kg/hr. The fuel is C8H18 (QR = 4.3 x 107 J/kg.) The ambient air temperature is 295K. The intake pressure gauge is broken, so the intake pressure is not known. Determine: (d) brake thermal efficiency, (e) indicated torque, (f) Is this engine throttled, turbocharged or neither? Explain. (Hint: compute the volumetric efficiency.)
In a laboratory test of a 4-stroke engine with Vd = 3.05 liters at N = 3000 RPM the following performance data are measured: net IMEP 107.9 lbf/in2 , 70.32 brake horsepower, fuel flow rate 16.66 kg/hr., air flow rate 269.6 kg/hr. The fuel is C8H18 (QR = 4.3 x 107 J/kg.) The ambient air temperature is 295K. The intake pressure gauge is broken, so the intake pressure is not known. Determine: (a) Brake MEP, (b) Friction MEP, (c) equivalence ratio, (d) brake thermal efficiency, (e) indicated torque, (f) Is this engine throttled, turbocharged or neither? Explain. (Hint: compute the volumetric efficiency.)

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