1. Intake air into a 4-stroke, 4-cylinder otto engine is 100 kPa, 21°C with an air-fuel ratio of 15. The heating value offuel is 43,966 kJ/kg. The ideal cycle efficiency is 50%. The actual engine has a volumetric efficiency of 75%. Thepiston speed is 816 m/min at 4000 rpm. Stroke-to-bore ratio is 1.1, and brake engine efficiency is 55%. Use hotair std. k = 1.33. For air, R = 287.08 J/kg K. Find (a) combustion pressure in bar (b) shaft torque in N-m (c) brakethermal efficiency in % (d) brake mean effective pressure in bar

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Answered: 1. Intake air into a 4-stroke,…

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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y (3) A 03 (4) (2) 04 |(1) References: a1 = 160 mm; a2 = 80 mm; a3 = 170 mm; a4 = 120 mm; 02 = 85 degrees, 03= 13.5 degrees, 04= 84.1 degrees, W2= 30 rad / s The angles W3 and W4 in the unit RAD/s according to those given for the four bar mechanism above find it.
1. Consider the dual cycle. Given k - Cp BTU lbm. R Cv kg.°K' (Cv0.171; P₁ = 101 kPa (14.7 psi) Cv 0.719 kJ T₁- 25°C (770F)T₂ - 1620°C (2948 °F) Engine Compression Ratio 17:12 The injection cycle of this diesel engine is such sufficient energy is added under constant volume to achieve a temperature of 1620°C (2948 °F) at position 3. The additional fuel energy added between point 3 and point 4 is 600 kJ/kg (260 BTUlb) a). Calculate all the unknown temperatures and pressure at all points in the cycle b). Determine net energy added to the cycle between point 2 and point 2a c). Determine the network for the cycle d). Calculate the indicated thermal efficiency for the cycle 4
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7. At the beginning of compression in an ideal air standard Diesel cycle, the compression ratio is 16 with P,= 100 kPa and T,=300K. The maximum temperature of the cycle is 2000K. If c,=1.005 Kj/Kgm-k and c=0.718 Kj/Kgm-k for the air, compute A) the pressure, temperature and volume at four corners of the cycle. B) the heat transfer. C)the work done per kgm for each process, and D) the cycle thermal efficiency
A spark ignition four-stroke cycle engine operates on an air-standard Miller cycle with no supercharger, and early intake valve closing (cycle 6-7-1-7-2-3-4-5-6 in Fig 15). Compres- sion ratio is 8.2 and expansion ratio is 10.2. Cylinder conditions when the intake valve clos- es are T, = 57°C and P, = 100 kPa. Maximum temperature and pressure in the cycle are Tmux = 3427°Cand Pmas = 9197 k Pa. Calculate: (a) Minimum cylinder pressure during cycle. [kPa] (b) Pump work for one cylinder for one cycle. [kJ] (c) Pressure in cylinder when exhaust valve opens [kPa]
An Sl engine with a compression ratio rc = 10.1:1 operates on the air standard Otto cycle at 4500 RPM. Maximum temperature in the cycle is 2700 °K and maximum pressure is 8200 kPa. The pressure in the cylinder when the exhaust valve opens is 600 KPa and the exhaust pressure is 98 kPa. The exhaust valve effectively opens at 56° ÞBDC. Calculate: 1. Time of exhaust blowdown in sec 2. The average temperature of the exhaust during the exhaust stroke in °K 3. The maximum flow velocity through the exhaust valve at the start of the blowdown process assuming chocked flow conditions in (m/sec)
What are the difference between jet cycle and open Brayton cycle.
Cycle work of an air standard otto engine is 1100 kj/kg. Maximum cycle temperature is 3300 deg. C and the temperature at the end of isentropic compression is 700 deg. C. Calculate the compression ratio of the engine. a. 9.34 b. 6.25 c. 7.78 d. 8.54
Q8) 1- What are the main differences between otto and diesel cycles? 2- Define the mean effective pressure of otto cycle. 3- if the minimum and maximum pressure in otto cycle is 1 bar and 20 bar respectively calculate the mean effective pressure if the otto cycle efficiency is 0.9?
3. Define any four performance parameters of a gas turbine engine with the help of well-defined equations.
7. An OTTO cycle operates on 0.15 lb/s of air from 15 psia and 1500F at the beginning ofcompression. The temperature at end of combustion is 50000R; compression ratio is 5:5; hot airstandard, k = 1.37.1 Solve for the volume flow rate at point 17.2 Determine the pressure at point 27.3 Calculate temperature at point 2
Cycle work of an air standard otto engine is 1100 kj/kg. Maximum cycle temperature is 3300 deg. C and the temperature at the end of isentropic compression is 700 deg. C. Calculate the compression ratio of the engine. (A) 9.34 (B) 6.25 7.78 (D) 8.54

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