Table of Contents
How do you find the indicated power of an engine?
The total indicated power is calculated as follows….The power produced by each cylinder unit is given by P*L*A*N *2* π /60 kw., where :
- P is the mean effective pressure given in KN/M.
- L is the length of stroke given in.
- A is the area of bore of each cylinder given in M2.
- N IS the RPM measured from counter readings .
What is the indicated power of an engine?
i) Indicated Power (ip) is defined as the power developed by combustion of fuel in the cylinder of engine. It is always more than brake power. ii) Mechanical efficiency : ηm : It is a measure of mechanical perfection of the engine or its ability to transmit power developed in the engine cylinder to the crank shaft .
How is indicated horsepower calculated?
Since hp is defined as work done at the rate of 33,000 ft-lb per minute, the total number of ft-lb of work performed by the engine is divided by 33,000 to find the indicated horsepower.
How do you calculate the indicated power of a 4 stroke engine?
Power in kW = (Pm LAN/n 100)/60 in bar where Pm = mean effective pressure L = length of the stroke in m A = area of the piston in m2 N = Rotational speed of engine RPM n= number of revolutions required to complete one engine cycle n= 1 (for two stroke engine) n= 2 (for four stroke engine) Thus we can see that for a …
What is the unit of indicated power?
indicated power (IP) (Unit kW) The theoretical power output calculated, for a piston engine, from the indicated mean-effective pressure imep (Pa), and given by IP = …
What is indicated power?
marine. The power developed in an engine cylinder. It is determined from an indicator diagram and certain basic information about the engine.
How is IHP measured?
For an internal-combustion engine, the mechanical efficiency e = bhp/ihp, where ihp = indicated horsepower. Thus, ihp = bhp/em, or ihp = 500/0.85 = 588 ihp (438.6 kW). 4. Compute the friction hp of the engine For an internal-combustion engine, the friction horsepower is fhp = ihp − bhp.
How is BHP measured?
Brake horsepower (bhp) is the power measured using a brake type (load) dynamometer at a specified location, such as the crankshaft, output shaft of the transmission, rear axle or rear wheels. In Europe, the DIN 70020 standard tests the engine fitted with all ancillaries and exhaust system as used in the car.
What is an indicator power?
The power developed in an engine cylinder. It is determined from an indicator diagram and certain basic information about the engine.
How is frictional power calculated?
Friction powers (FP) in kW for operating points were then calculated by subtracting brake power (BP) from indicated power (IP), under steady state conditions for both engine lubricants.
How to calculate indicated power of an engine?
Indicated power (Pi) = Pm * A * L * N. Pm -Mean indicated pressure. A – Area of Piston. L – Length of stroke. N -No.of power stroke/sec. In this formula we know the values of A,L and N, Pm (mean indicated pressure) can be calculated by the use of engine indicator. Brake Horsepower (Bp) or Shaft Horsepower (Sp)
How do you measure the cylinder power?
The cylinder power can be measured if the scaling factors, spring calibration and some basic engine details are known. The cylinder power values are compared, and for balanced loading should all be the same. Adjustments may then be made to the fuel supply in order to balance the cylinder loads.
How do you measure the power of a marine diesel engine?
Marine diesel engine power measurement guideline. There are two possible measurements of engine power: the indicated power and the shaft power. The indicated power is the power developed within the engine cylinder and can be measured by an engine indicator.
What is the difference between indicated power and shaft power?
The indicated power is the power developed within the engine cylinder and can be measured by an engine indicator. The shaft power is the power available at the output shaft of the engine and can be measured using a torsionmeter or with a brake.