Abstract
This paper deals with the performance analyses of exergetic, exergoeconomic, sustainability and environmental damage cost for J85 turbojet engine at Idle (ID), Intermediate (INT), Military (MIL) and Afterburner (AB) operation modes. The exergetic efficiency of whole engine is calculated to be 0.24 % at ID, 18.67 % at INT, 29.81 % at MIL and 22.77 % at AB modes, respectively. The unit exergy cost of product is accounted to be 30,423.94 $/GJ at ID, 269.35 $/GJ at INT, 121.47 $/GJ at MIL and 133.47 $/GJ at AB modes. The sustainable cost index is found to be 30,350.92 $/GJ at ID, 224.45 $/GJ at INT, 85.26 $/GJ at MIL and 103.0 $/GJ at AB modes while the sustainability index is obtained to be 1.0 at ID, 1.2 at INT, 1.43 % at MIL and 1.3 at AB modes. On the other hand, the environmental damage cost rate of engine are calculated to be 180.22 $/h at ID, 271.34 $/h at INT, 657.95 $/h at MIL and 1992.55 $/h at AB modes while the total cost rates of engine are determined to be 974.07 $/h at ID, 1357.15 $/h at INT, 2641.76 $/h at MIL and 6573.04 $/h at AB modes, respectively. The results indicate that J85 engine operates the exergetic-efficiently and cost-effectively at MIL mode.
Funding statement: Any funding source does not used for this paper.
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Any material included in this paper is not under copyright.
Nomenclature
area (m2)
annual capital cost rate ($/yr)
unit exergy cost ($/GJ)
cost rate ($/h)
capital recovery factor
depletion number
exergy rate (kW)
economic profits rate of improvement potential ($/GJ)
gravity
interest rate (%)
exergetic improvement potential(GJ/h)
thrust (kN)
fuel cost rate ($/yr)
fuel selling price ($/kg)
fuel-product ratio (−)
lower heating value of fuel (kJkg−1)
mass flow rate (kg/s, kg/h)
lifetime of the system (yr)
- P
pressure (kPa)
purchased equipment cost ($)
present value factor (-)
present worth ($)
heat rate (GJ/h)
- R
universal gas constant(kJ kg−1K−1)
- SI
sustainability index
sustainable cost index ($/GJ)
specific fuel consumption (kg/Nh)
salvage value ($)
- T
temperature (K)
total capital investment cost ($)
velocity (m/s)
work rate or power rate(GJ/h)
hourly levelized capital cost rate ($/h)
altitude (m)
- Greek Letters
relative exergy consumption ratio (%)
Fuel exergy depletion ratio (%)
productivity lack ratio (%)
relative improvement potential (%)
fuel exery grade function
relative cost difference (%)
operating time (h/yr)
salvage ratio (%)
exergoeconomic factor (%)
exergetic efficiency (%)
eco-cost value of unit environmental damage ($/kg)
- Subscripts
- a
Air
- ABED
afterburner exhaust duct
- AC
air compressor
- AP
afterburner fuel pump
- C
exergy consumption (losses and destruction)
- CC
combustion chamber
- ch
Chemical
- D
Destruction
- DC
diffuser casing
- DP
Desired product
- env
Environment
- ex
Exergy
- f
fuel, inlet streams as a fuel
- g
combustion gasses
- GT
Gaz turbine
- GTMS
gas turbine mechanical shaft
- in
Input
- k
k’th component
- kn
Kinetic
- L
Losses
- MP
main fuel pump
- out
Output
- P
Pressure
- ph
Physical
- Pr
Product
- pt
Potential
- T
Temperature
- TJE
turbojet engine
- 0
dead state
- Superscripts
- CI
capital investment cost
- OM
Operating and maintanence cost
- TC
Total cost
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