What is meant by brake specific fuel consumption?
What is meant by brake specific fuel consumption?
Brake-specific fuel consumption (BSFC) is a measure of the fuel efficiency of any prime mover that burns fuel and produces rotational, or shaft power. It is typically used for comparing the efficiency of internal combustion engines with a shaft output. It is the rate of fuel consumption divided by the power produced.
What is BSFC and ISFC?
This effect can be explained as follows with the calculation of brake specific fuel consumption (BSFC) at a typical Federal Test Procedure (FTP) cycle operating condition, assuming a constant indicated specific fuel consumption (ISFC).
How do you use specific fuel consumption?
Simple Method
- Formula To Estimate Maximum Engine Fuel Consumption. Gallon Per Hour (GPH) = (specific fuel consumption x HP)/Fuel Specific Weight.
- 300-hp Diesel Engine Example. GPH = (0.4 x 300)/ 7.2 = 105/7.2 = 16.6 GPH.
- 300-hp Gasoline Engine Example. GPH = (0.50 x 300)/ 6.1 = 150/6.1 = 24.5 GPH.
- Other Related Resources:
What is thrust specific fuel consumption and what is brake specific fuel consumption?
Thrust-specific fuel consumption (TSFC) is the fuel efficiency of an engine design with respect to thrust output. TSFC may also be thought of as fuel consumption (grams/second) per unit of thrust (kilonewtons, or kN). It is thus thrust-specific, meaning that the fuel consumption is divided by the thrust.
What is the importance of specific fuel consumption?
But the amount of fuel used to generate that thrust is sometimes more important, because the airplane has to lift and carry the fuel throughout the flight. Engineers use an efficiency factor, called thrust specific fuel consumption, to characterize an engine’s fuel efficiency.
What is specific fuel consumption of diesel?
The lower the brake specific fuel consumption, the more efficient the engine is. For spark ignition (gasoline engine) the BSFC is around 250 g/kWh and for compression ignition (diesel) around 200 g/kWh.
How is Bmep calculated?
BMEP = (Torque x 75.4) / (Displacement x PPR) It is also clear that because the equation includes PPR ( Power Pulses per Revolution ), it applies to engines with any number of cylinders by using the total displacement, total brake torque, and correct PPR.
What is the significance of specific fuel consumption?
Specific fuel consumption is the amount of fuel consumed by a vehicle for each unit of power output. A vehicle’s specific fuel consumption is more or less independent from its nitrogen oxide emissions per kilometer. The specific fuel consumption of an engine is the rate of fuel burnt to produce a unit of thrust.
Is fuel consumption proportional to RPM?
RPMs and fuel consumption have only a very slight correlation. (As higher RPMs correlate with an increase in friction losses.) You therefore need to measure fuel flow to calculate fuel consumption, which will be affected by a combination of engine load and RPM.
What causes high fuel consumption in diesel engines?
This bad habit is threefold – driving too fast, accelerating too quickly, and stopping too suddenly. All three of these actions lead to high fuel consumption. Where possible, you should accelerate slowly and drive with the speed of traffic.
Why is specific fuel consumption important?
What does BMEP stand for?
NOTATION
| BMEP | brake mean effective pressure (bar) |
|---|---|
| D | diameter (m) |
| f | function |
| HP | high pressure |
| I | inertia |
What do you mean by brake specific fuel consumption?
It is the rate of fuel consumption divided by the power produced. It may also be thought of as power- specific fuel consumption, for this reason. BSFC allows the fuel efficiency of different engines to be directly compared.
What do engineers call the specific fuel consumption?
Engineers use an efficiency factor, called thrust specific fuel consumption, to characterize an engine’s fuel efficiency. “Thrust specific fuel consumption” is quite a mouthful, so engineers usually just call it the engine’s TSFC .
How to reduce brake specific fuel consumption ( BSFC )?
By increasing the engine torque to 250 Nm we decrease the brake specific fuel consumption to 320 g/kWh. The excess torque (150 Nm) will be compensated by the electric machine (-150 Nm) which will run in generator mode and produce electrical energy.
Which is more efficient compression ignition or brake specific fuel consumption?
The lower the brake specific fuel consumption, the more efficient the engine is. For spark ignition (gasoline engine) the BSFC is around 250 g/kWh and for compression ignition (diesel) around 200 g/kWh. The brake specific fuel consumption of an engine is usually represented as a contour plot,…