Question

In: Mechanical Engineering

12. Design a cast iron flywheel having six arms for a four stroke engine developing 120...

12. Design a cast iron flywheel having six arms for a four stroke engine developing 120 kW at 150 r.p.m.
The mean diameter of the flywheel may be taken as 3 metres. The fluctuation of speed is 2.5% of mean
speed. The workdone during the working stroke is 1.3 times the average workdone during the whole
cycle. Assume allowable shear stress for the shaft and key as 40 MPa and tensile stress for cast iron as
20 MPa. The following proportions for the rim and elliptical arms may be taken:
(a) Width of rim = 2 × Thickness of rim
(b) Major axis = 2 × Minor axis

Solutions

Expert Solution

samet mamat answered 1 year ago
Next > < Previous

Related Solutions

5. Design a cast iron flywheel for a four stroke cycle engine to develop 110 kW...
5. Design a cast iron flywheel for a four stroke cycle engine to develop 110 kW at 150 r.p.m. The work done in the power stroke is 1.3 times the average work done during the whole cycle. Take the mean diameter of the flywheel as 3 metres. The total fluctuation of speed is limited to 5 per cent of the mean speed. The material density is 7250 kg / m3. The permissible shear stress for the shaft material is 40...
Design a four stroke cycle for SI engine using crankcase compression. Draw schematics of the six...
Design a four stroke cycle for SI engine using crankcase compression. Draw schematics of the six basic process: intake, compression, combustion, expansion, blowdown and exhaust. Describe fully the intake of air, fuel and oil.
11. A cast iron flywheel is to be designed for a single cylinder double acting steam...
11. A cast iron flywheel is to be designed for a single cylinder double acting steam engine which delivers 150 kW at 80 r.p.m. The maximum fluctuation of energy per revolution is 10%. The total fluctuation of the speed is 4 per cent of the mean speed. If the mean diameter of the flywheel rim is 2.4 metres, determine the following : (a) Cross-sectional dimensions of the rim, assuming that the hub and spokes provide 5% of the rotational inertia...
15. A four stroke oil engine developing 75 kW at 300 r.p.m is to have the...
15. A four stroke oil engine developing 75 kW at 300 r.p.m is to have the total fluctuation of speed limited to 5%. Two identical flywheels are to be designed. The workdone during the power stroke is found to be 1.3 times the average workdone during the whole cycle. The turning moment diagram can be approximated as a triangle during the power stroke. Assume that the hoop stress in the flywheel and the bending stress in the arms should not...
A test was conducted on a 4-stroke four cylinder engine having 6.9 cm diameter and 8.9...
A test was conducted on a 4-stroke four cylinder engine having 6.9 cm diameter and 8.9 cm stroke. The fuel supply to the engine is 0.065 kg/min. The B.P measurements are given below with constant engine speed of 300 rpm: With all cylinder firing = 16.9 kW Cut off at 1st cylinder = 8.46 kW Cut off at 2nd cylinder = 8.56 kW Cut off at 3rd cylinder = 8.6 kW Cut off at 1st cylinder = 8.46 kW If...
1) A four-stroke diesel engine has a piston diameter of 16.5 cm and a stroke of...
1) A four-stroke diesel engine has a piston diameter of 16.5 cm and a stroke of 27 cm. The compression ratio is 14.3, the cut-off 4.23% of the stroke and the mean effective pressure 4.12 bar. The engine speed is 264 rev/min and the fuel consumption is 1.076 kg of oil per hour, having a calorific value of 39150 kJ/kg. Calculate the relative efficiency of the engine 2). A diesel engine has a brake thermal efficiency of 30%. If the...
During the power stroke in a four-stroke automobile engine, the pis-ton is forced down as the...
During the power stroke in a four-stroke automobile engine, the pis-ton is forced down as the mixture of combustion products and air undergoes an adiabatic expansion. Assume (1) the engine is running at 2500 cycles/min; (2) the pressure immediately before the expansion is 20.0 atm; (3) the volumes of the mixture immediately before and after the expansion are 50.0 cm3and 400 cm3, respectively ; (4) the time interval for expansion is one-fourth that of the total cycle; and (5) the...
A single-cylinder, four stroke research engine operates on Otto cycle. The specification of the engine is...
A single-cylinder, four stroke research engine operates on Otto cycle. The specification of the engine is shown as below:- Displacement volume of the cylinder = 540 cm3 Clearance volume of the cylinder = 60 cm3 Minimum temperature = 200°C Minimum pressure = 200 kPa Net work output = 1000 kJ/kg Sketch the process on a P-V diagram and by using constant specific heat at room temperature, determine: i) the temperature and pressure at each process, ii) the thermal efficiency of...
A single-cylinder, four stroke research engine operates on Otto cycle. The specification of the engine is...
A single-cylinder, four stroke research engine operates on Otto cycle. The specification of the engine is shown as below:- Displacement volume of the cylinder = 560 cm3 Clearance volume of cylinder = 70 cm3 Minimum temperature = 200°C Minimum pressure = 200 kPa Net work output = 1000 kJ/kg Sketch the process on a P-V diagram and by using constant specific heat at room temperature, determine: 1) the temperature and pressure at each process, 2) the thermal efficiency of the...
A two-cylinder, four-stroke gas engine has a bore of 380 mm and a stroke of 585...
A two-cylinder, four-stroke gas engine has a bore of 380 mm and a stroke of 585 mm. At 240 rev/min the torque developed is 11.86 kNm. If the engine is supplied with a mixture of gas and air in the proportion of 1 to 7 by volume. The estimated volumetric efficiency is 85% and the Qnet,p of the gas is 38.6 MJ/m3. Calculate the brake thermal efficiency of the engine.
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT