Flight-SIM : Generic DB of single-aisle Airliner : Part 1

Previous Work Status

Missile-SIM : Performance Evaluation for Iskander / Kh-47M2 Kinzhal & ATACMS+Booster
The new topic for My page : Optimization of Supersonic aerodynamic aircraft

Flight-SIM : Trajectory & Performance Analysis for Jet Aircraft

Flight-SIM : DB Structure of the SIM
Flight-SIM : W.I.P of the SIM 

1. Trajectory DB

 Compare to the Missile-SIM, Flight-SIM has more options than the previous one. Indeed Trajectory DB has more complex options than the previous one. There is a few update after the previous article. (Flight-SIM : DB Structure of the SIM) 

<Trajectory Input DB>

 1) Act_num : Identification number for the each action
 2) Action : Information for Action 
     - START : Set up of Initial State (Lat, Long position and flight direction)
     - RESERVE : Fuel Reserve usually for 5% of initial fuel
     - TO : Take-Off action uses TOGA thrust fuel flow for specified time at given speed and altitude
     - SID : Climb action for limited fpm and speed which did not counted for range
     - CLIMB : Climb action for several options (specified VS, Speed or Optimal ROC) with range 
     - CRUISE : Cruise with optimal cruise altitude/speed or Specific altitude/speed
     - DESCEND : Descend action as same as CLIMB
     - LOITERING : loitering before STAR action which did not counted for range
     - STAR : Descend action as same as SID
     - LD : Landing action uses 80% power for specified time at given speed and altitude
 3) Opt [On/OFF] : On/Off option for TO/LD, SID/STAR only, and % of reserve fuel
 4) Others are Specification for each action
     - If required data were not specified, program find optimal profile for CLIMB/CRUISE/DESCEND
 5) Cfg/Cfg_eng : Identification number for Configuration of the aircraft
     - Configuration number means that each number load different engine or aircraft DB
       (it is useful for multi-mode engine for Aerospace plane) 



2. Engine DB

 Missile-SIM only requires ISP value for the engine with burn-time and amount of fuel; Flight-SIM engine needs separated DB because thrust, fuel-flow, drag, inlet performance, CD, and CM value are affected by Throttle, Alt, AoA, Flight Mach conditions. 

<Engine DB for Thrust>

 Engine throttle values are chosen for 0, 70, 85, 100, and 110; these represent off, idle, cruise, climb, and TOGA condition for high bypass engine while off, idle, cruise, mil power, full AB for other type of engines respectively. 

 Unfortunately, these specific engine data is not disclosed by engine manufacturers, and author have to estimate the performance value from the generic formula as shown below. 

 1) SFC - Thrust and Fuel Flow

<Fuel Flow estimation from the generic thrust map>

 2) Thrust change for Altitude and Mach number conditions
    
     Turbojet

<Generic formula for turbojet engine using SL Thrust>

     Turbofan (high and low pypass)

                                      <Generic formula for turbofan engine using SL Thrust>

 3) Inlet Performance

There is no kind of generic formula; but if type or number of the shock is chosen, rough scale of the pressure recovery is already known. 

                              <Generic trend of the pressure recovery value from number of shock>


 4) Drag, CL, CM

Impact of thrust on the drag, lift, and momentum is known, however, in this case, specific value of the three sheet will be set to zero. 

More specific value for these threes will be described when more specific aircraft design is proceeded. 

 Reference
[1] https://www.scribd.com/read/282549616/General-Aviation-Aircraft-Design-Applied-Methods-and-Procedures