Hi Everyone,
1. what is the meaning of the value for SFC (specific fuel consumption) or Thrust be negative when the altitude increases?
2. how can I identify the altitude and Mach Number for small-scale Turbojet?
3. What are the reasons if the curve for SFC improves to limit altitude for example till 6000 m but after that altitude, it will decrease? ( SFC and Altitude )
Kindly,
Specific fuel consumption is the amount of fuel consumed by a vehicle for each unit of power output. Generally, if you are talking about specific fuel consumption. Then, we can say according to the formula, it is the ratio of fuel consumed to power gain. More specifically if we are going Deep, then you may understand that turbine produces some amount of power which is consumed by the compressor of gas turbine engine. After this use of power by compressor, the amount of power left out is considered for calculating specific fuel consumption.
Now if you want to understand that trust and altitude relation then you have to first know about atmospheric changes encounter with increase in in altitude. The curve of SFC with respect to altitude majorly depends on the type of gas turbine engine we are considering.
You can refer this publications for more details about sfc curve versus altitude.
Article Development of Novel Computer Program for Cycle Analysis of ...
Article Numerical Analysis on Thermodynamic Performance of Simple Tu...
There is no fixed rule to identify altitude and Mach number for any engine. It's all dependent on experience and iteration over large number of operating conditions.
Is the mass of fuel needed to provide the net thrust for a given period, specific fuel consumption of air-breathing jet engines at their maximum efficiency is more or less proportional to speed, it varies with throttle setting, altitude and climate
Specific fuel consumption is the capability of converting the mass or mass flow rate into useful energy, for any engineering device.
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