What are the methods to calculate friction power?
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.
What is the limitations of Willian’s line method?
Limitations of Willans line method: Willan’s line method is only used in the compression ignition (C.I) engine. It is not applicable to S.I engine. The friction power given by this method is approximate. Friction power changes while an increase in engine speed.
Which of the following method can be used to find friction power of an engine?
Which of the following is the most accurate method of determining friction power? Explanation: The friction power can be obtained by measurement of the brake and indicated power. The indicated power can be obtained by indicated diagram and brake power obtained by a dynamometer.
What is Williams line?
The Willans line represents the relationship between fuel energy input and engine output. Extrapolation to a zero line of fuel input provides a useful approximation of the mechanical losses. Linearity of these curves is assumed in the range from low load downward to a hypothetical zero value of the indicated work.
What test determines frictional power?
A simple yet reliable method to evaluate the overall friction power of an internal combustion engine is proposed. The method is based on the measurement of the angular deceleration of the engine speed.
What are the assumptions made in Morse test?
The assumption made on the test is that frictional power is depends onthe speed and not upon the load on the engine .
What is IP BP FP?
It is the difference between Indicated power and Brake power. fp = ip – bp. ∴ ip > bp. Indicated thermal efficiency : It is the ratio of IP to fuel power.
What is BP IP and FP?
If ip → indicated power, bp → brake power, fp → frictional power.
What is IP and BP in IC Engine?
N = Speed of the engine in r.p.m. Note : The brake power (B.P.) of an engine is always less than the indicated power (I.P.) of an engine, because some power is lost in overcoming the engine friction (known as frictional power).
What is Imep and BMEP?
Indicated mean effective pressure (IMEP) is the mean effective pressure calculated with indicated power (work). This parameter does not take into account the efficiency of the engine. Brake mean effective pressure (BMEP) is the mean effective pressure calculated from the dynamometer power (torque).
What is the use of motoring test?
(iv) Motoring Test: In the motoring test, the engine is connected to the electric motor and the engine is run at constant speed using the motor. The power required to drive the engine is given by the power consumed by the motor. The power is consumed by the motor in overcoming the friction of the engine moving parts.
What are the concluding remarks about Morse test?
CONCLUSION After performing the Morse test we can conclude that it is the most useful engine test to calculate the performance of the engine mainly the Multicylinder engines and in future the use is going to increase and it is very easy to calculate the performance of the engine.
How are IHP FHP and BHP related?
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.
What is the formula of brake power?
The power developed by an engine at the output shaft is called brake power and is given by Power = NT/60,000 in kW where T= torque in Nm = WR W = 9.81 * Net mass applied in kg.
What is SFC in locomotive?
Specific Fuel Consumption of an engine may be defined as the amount of fuel consumed per unit work done. i.e. SFC = Amount of Fuel consumed (in Kg/ gms/ lbs/….. )/ Amount of work done. (in kgm/ Nm/ Joules/BHP.hr …)
What is Willan’s line method?
Willan’s line method is also known as the fuel rate extrapolation method. In this method, we draw a graph where we take brake power (B.P) (kW) on X-axis and fuel flow rate (kg/hr) on Y-axis on a condition that the engine is running at a constant speed.
How does engine speed affect friction power in willan line test?
Friction power changes while an increase in engine speed. That’s why the engine should run at a constant speed throughout the Willan’s line test We have discussed about willans line method for the measurement of the friction power.
Can we characterize mechanical losses on the basis of identified Willans parameters?
The matching between Willans line scaled performance and experimental ones was extensively tested, thus allowing to reliably proceed to the subsequent objective of characterizing mechanical losses on the basis of identified Willans parameters.
Can the Bishop model predict performance from Willans derived losses?
This latter task was accomplished by comparing Willans derived losses to those estimated via the Bishop model, extensively adopted in the related literature to predict such a key performance variable.