Q5. Calculate the air standard efficiency and work of an Otto cycle, has a clearance ve 0.0003 m³ and a bore and stroke of 152. mm and 200 mm, respectively. If the pr temperature at the beginning of the compression are 100 kN/m2 and 24 °C. respe

Q5. Calculate the air standard efficiency and work of an Otto cycle, has a clearance ve 0.0003 m³ and a bore and stroke of 152. mm and 200 mm, respectively. If the pr temperature at the beginning of the compression are 100 kN/m2 and 24 °C. respe

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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The swept volume of an engine working on the dual combustion cycle is 0.1068m³. The clearance volume is 8% of the swept volume. At the beginning of compression the air conditions are 100kPa and 42°C The maximum cycle conditions are 4500kPa and 1500°C. Calculate: (a). thermal efficiency (b). mean effective pressure (c). exhaust pressure (d). air-fuel ratio if the calorific value of the fuel is 43MJ/kg Assume the compression and expansion to be adiabatic. Use the standard constants for air.
You have been asked to help with the low-pressure compressor (LPC) design for a turbofan engine with a bypass ratio of 8.4. The preliminary cycle design calls for the LPC to produce a pressure ratio of 9.4 with the following operating conditions and constraints. .Inlet Conditions TO2 Poz Core Air Mass Flowrate (kg/s) (K) (kPa) 282 24.6 47.0 Design Constraints Maximum Polytropic Efficiency 94.1% Maximum Stage Pr 1.55 Estimate the minimum number of stages required for this LPC. Then assuming the 1st stage of the LPC operates at the maximum allowable pressure ratio, determine the stagnation temperature exiting the 1st stage, and the stage's adiabatic efficiency. Also determine the power (W) required to operate the full LPC (not just 1st stage). Finally, what would be the percent change in the required power if the polytropic efficiency was only 90.0%.
In a 4-cylinder 4-stroke KA engine with volumetric efficiency ɳe=0.85, compression ratio 14: suction reference pressure 96 kPa, suction reference temperature 298 K; Exhaust pressure 108 kPa, exhaust temperature 1200 K; Find the pressure loss in the suction system since the end suction temperature is 310 K. The gas constant of the residual gas is Rr=291.9 J/kgK, Rref=Rsuction=287.13 J/kgK, the stroke volume of the engine is 0.598 liters.
A four-cylinder, 2.4-liter engine operates on a four-stroke cycle at 3200 rpm. The compression ratio is 9.4:1, the connecting rod r = 18cm, and the bore and stroke are related as S = 1.06B Calculate: (1) Volume in the combustion chamber when crank angle at 90 degrees (2) Clearance volume of one cylinder in cm³, L, and in3 (3) Bore and stroke in cm and in (4) Average piston speed in m/sec and ft/sec
In a 4-cylinder 4-stroke KA engine with volumetric efficiency nv = 0.85, compression ratio 14: suction reference pressure 96 kPa, suction reference temperature 298 K; Exhaust pressure 108 kPa, exhaust temperature 1200 K; Find the pressure loss in the suction system since the end suction temperature is 310 K. The gas constant of the residual gas is Rr = 291.9 J / kg K, Rref = Rem = 287.13 J / kg K, the stroke volume of the engine is 0.598 liters.
A The compression ratio of a diesel cycle is 15.5, and the cutoff occurs at 10% of the stroke. 14 psia and 600 K characterize state 1. Calculate the following for the hot-air standard with k= 1.34 and a starting volume of 2 cu ft: Qin a. Find T2 , P2 , V2 , T3 , V3 , P4 , and T4 3 P = P, b. Compute the heat added (QA), Wout heat rejected (Qr), work (W) and the cycle efficiency (e). P. c. for a rate of circulation of 1000 cfm, Qout compute the horsepower.
Ans. 3908 m/min. 14.5 Find the cylinder dimensions of a single-cylinder, double-acting compressor handling 28.32 e/revolution of air from 99.975 kPaa to 723.954 kPaa. Compression and reexpansion are in accordance with PV135 = C. Use the conventional volumetric efficiency; c = 5% and L/D = 1. %3D %3D
Compute for the discharge pressure in bar of a single-acting air compressor if the piston-arrangement has a clearance of 7.5% and a volumetric efficiency of 75%. The isentropic compression has an intake pressure of 750 mmHg a. 4.46b. 5.57c. 6.68d. 7.79
Q2//The rotational-speed of an impulse turbine wheel is 3000 r.p.m. The nozzles are inclined at 20° and their efficiency is 0.89. The isentropic heat drop for the stage is 159 kJ/kg. If the blade speed ratio is 0.4, the blade speed coefficient is 0.82, and the blade efficiency is 0.76. Find for steam flow rate of 15 kg/s: 1. The mean blade ring diameter. 2. The power developed by the stage. B = 32.4°:Be : 38.5°). %3D %3D Answer (1.355m, 1613.2 kW,
John’s automobile has a three-liter SI-V6 engine that operates on a four-stroke cycle at 3600 RPM. The compression ratio is 9.5, the length of connecting rods is 16.6 cm, and the engine is square (B=S). at this speed, combustion ends at 20o at T.D.C. This engine is connected to Dynamometer which gives a brake output torque reading of 205 N-m. At his speed, air enters the cylinders at 85 kPa and 60o C, and the mechanical efficiency of the engine is 85%. Calculate: (a) Brake power, HP || (b) Indicated Power, HP || (c) Brake Mean Effective Pressure, Bmep , Psia || (d) Indicated Mean Effective Pressure, Imep, Psia || (e) Friction Mean Effective Pressure, Fmep, Psia
3.11) The conditions of air at the entry of an axial compressor stage are: Рi %3D 768 тт Hg & Ti = 314 K. The air angles are B1 = 51°, B2 = 9°, a1 = az = 7°. The mean diameter 50 ст. The peripheral speed 100 m/s. Mass-flow rate 25 kg/s work done factor 0.95 mechanical efficiency 92 % stage efficiency 88 % (a) Air angle at the stator entry, [a2 50.18°] (b) Blade height at entry and the hub-tip diameter ratio, [h, = 19 cm ; dn/d = 0.449] (c) Stage loading coefficient. [V = 0.754] (d) Stage pressure ratio. [Po3/Po1 1.075] (e) The power required to drive the stage. [Power = 204.75 kW]
5. A 6-cylinder reciprocating engine operates on air-standard Diesel cycle, each cylinder having 115 mm bore and 125 mm stroke and a speed of 2000 rpm. The temperature and pressure at the beginning of compression stroke are 300 K and 100 kPa respectively and the maximum temperature permitted is 1650 K. The clearance volume is one-eighth of the stroke volume. Assume air as an ideal gas with Cp = 1.005 kJ/kg K and Cy = 0.718 kJ/kg K. Calculate: (a) The compression ratio (b) The temperature and pressure after compression