specific fuel consumption


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specific fuel consumption

[spə′sif·ik ′fyül kən‚səm·shən]
(mechanical engineering)
The weight flow rate of fuel required to produce a unit of power or thrust, for example, pounds per horsepower-hour. Abbreviated SFC. Also known as specific propellant consumption.

Specific fuel consumption

The ratio of the fuel mass flow of an aircraft engine to its output power, in specified units. Specific fuel consumption (abbreviated sfc or SFC) is a widely used measure of atmospheric engine performance. For reciprocating engines it is usually given in U.S. Customary units of pound-mass per hour per horsepower [(lbm/h)/hp or lbm/(hp·h)], and International System (SI) units of kilograms per hour per kilowatt [(kg/h)/kW]. See Reciprocating aircraft engine

For the gas turbine family of atmospheric aircraft engines, and for ramjets, performance is usually given in terms of thrust specific fuel consumption (abbreviated tsfc or TSFC) expressed as fuel mass flow per unit thrust output with Customary units of pound-mass per hour per pound-force [(lbm/h)/lbf] or SI units of kilograms per hour per newton [(kg/h)/N; 1 N equals approximately 0.225 lbf]. For high-supersonic and hypersonic ramjets, specific fuel consumption is sometimes given in pound-mass per second per pound-force [(lbm/s)/lbf] or kilograms per second per newton [(kg/s)/N]. See Aircraft propulsion, Jet propulsion, Propulsion, Ramjet, Turbine propulsion, Turbojet

specific fuel consumption (SFC)

The quantity of fuel consumed (by weight) to produce one unit of power in one unit of time. In piston engines, the SFC is equal to the mass ratio of fuel/shaft horsepower. In gas turbine engines, the SFC is equal to the mass ratio of fuel/thrust. It is best when its value is minimum. The value of the SFC decreases with height and in colder temperature conditions.
References in periodicals archive ?
1 we can draw specific fuel consumption dependences on hourly fuel consumption for specific engine run modes (Fig.
This schedule keeps the turbine-inlet temperature high and the specific fuel consumption love.
The curves for torque, power, and specific fuel consumption at full charge, in particular, according to engine speed were obtained.
An increase in brake specific fuel consumption, especially at lower engine loads, with a maximum of 32.4% reducing engine brake thermal efficiency with a maximum of 21.7% has been observed.
* Brake specific fuel consumption values of fish oil biodiesel and its diesel blends are slightly higher than diesel.
The GEnx engine reportedly provides better specific fuel consumption and payload performance than CF6 engines.
One is reduced piston skirt friction losses due to reduced thermal expansion of the steel skirt which leads to less variation in skirt clearance -- approximately one percent higher output, which results in 1 percent lower specific fuel consumption, the company said.
Because engines are typically sized to meet acceleration targets, they often operate at a load level that diminishes brake specific fuel consumption. Severinsky saw there was no way to mechanically alter this fact without harming performance, and decided to attack the problem from another direction.
Furthermore, the high ignition potential generated by the system enables the use of lean mixture preparation in the main chamber, which reduces the C[O.sub.2] level as well as the specific fuel consumption and N[O.sub.x] emission.
Some research indicated that the use of ED mixtures change the performance of the cycle diesel engine, causing variations in the power and specific fuel consumption. By adding ethanol in diesel fuel, the power and the engine torque decrease and fuel consumption increases as a consequence of lower calorific value, cetane number, and delay in the injection point (RAHIMI et al., 2009).
By assuming the vehicle data listed in Table 2 for the test engine, the calculated specific fuel consumption (calculated SFC) [g/kWh] and fuel efficiency (calculated FE) [km/L] determined in the conventional simulation method shown in Figure 1 were compared with the measured SFC [g/kWh] and measured FE [km/L], respectively, obtained with the engine test cell during transient operation under empty, half-load, and full-load conditions.
The variation of specific fuel consumption is shown in fig.4 for different fuel injection timing and blend ratio.

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