A four-stroke Cl engine of 3.0 liter capacity develops indicated power on average of 13.0 kW/m³ of free air induced per minute, while running at 3600 rpm and having a volumetric efficiency of 72 percent, referred to free air conditions of 1.013 bar and 25°C. A blower driven mechanically from the engine is proposed to be installed for supercharging. It works through a pressure ratio 1.7 and has an isentropic efficiency of 80 percent. Assume that at the end of the intake stroke the cylinders contain a volume of charge equal to the swept volume, at the pressure and temperature of the delivered air from the blower. Taking all mechanical efficiencies to be 80 percent, estimate the air mass flow delivered by the blower in kg/s. A 0.0986 B) 0.1320 0.1108 0.1542

A four-stroke Cl engine of 3.0 liter capacity develops indicated power on average of 13.0 kW/m³ of free air induced per minute, while running at 3600 rpm and having a volumetric efficiency of 72 percent, referred to free air conditions of 1.013 bar and 25°C. A blower driven mechanically from the engine is proposed to be installed for supercharging. It works through a pressure ratio 1.7 and has an isentropic efficiency of 80 percent. Assume that at the end of the intake stroke the cylinders contain a volume of charge equal to the swept volume, at the pressure and temperature of the delivered air from the blower. Taking all mechanical efficiencies to be 80 percent, estimate the air mass flow delivered by the blower in kg/s. A 0.0986 B) 0.1320 0.1108 0.1542

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

Intake air into an Otto engine is at 14.7 psia and 530 deg R with an Air- Fuel Ratio of 15. The heating value of the fuel is 18,900 BTU/lb fuel. The corresponding ideal cycle efficiency is 50%. The actual engine has a volumetric efficiency of 75% and a brake engine efficiency of 55%. Use an overall value of k = 1.33. Compute the brake mean effective pressure and the compression ratio of the engine. ANS: 105.5 psi, 8.18
.
A spark ignition engine of a compression ratio of 8 , operates with stoichiometric fuel-air ratio of hydrocarbon fuel of C8H18. The pressure and temperature inside the cylinder at the start of compression are 1 atmosphere and 350 K respectively. Find the temperature and pressure per unit mass of air at the end of compression stroke. Also find the maximum temperature and pressure in the cycle assuming residual gas fraction is 0.08 and the exhaust temperature is 1800 K. ( note LCV= 44300 kJ/kg and Cpf = 1.979 kJ/kg.K .
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]
The pressure and temperature at the beginning of compression of a cold air-standard Diesel cycle are 95 kPa and 300 K, respectively. At the end of the heat addition, the pressure is 7.2 MPa and the temperature is 2250 K. Assume constant specific heats evaluated at 300 K. The compression ratio is 22 The cutoff ratio is 2.18 The thermal efficiency is 65.25% FIND THE MEAN EFFECTIVE PRESSURE IN kPa mep = ?
14 A six-cylinder SI engine with a compression ratio of 10.5:1 operates on a four-stroke cycle at 3000 RPM. Air enters the cylinders at T = 110 F and P 12.8 psia. The intake valve closes at 20° aBDC and combustion starts when the spark plug fires at 15° 6TDC. Con- necting rod length is 6.64 in. and crank offset is 1.66 in. Calculate: (a) Cylinder temperature at start of combustion using air-standard Otto cyde analysis ['F] (b) Cylinder temperature when spark plug fires assuming compression doesn't start until intake valve closes. [F]
An air-standard Compression Ignition cycle has a compression ratio of 18.2. Air is at 32000R at the end of the heat addition process. Neglecting the variation of specific heats with temperature,determine the following:a. Cut-off ratiob. Net output work of the cyclec. Heat rejection per unit mass, Btu/lbd. Thermal efficiency of the cycle(%). Compare this efficiency value if the cycle has to run on an airstandard Carnot Cycle.
Give: Otto cycle Compression ratio = 9 Intake air is at 100kpa and 20°C Maximum cylinder volume = 500 cm^3 Temperature at the end of the adiabatic compression = 800 K CP = 1.01kJ/kgk, Cv = 0.718 kJ/kg, k = 1.4, R = 287.1 J/kgk T4 = 800 K
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