OPTIMAL MISSION ANALYSIS ACCOUNTING FOR ENGINE AGING AND EMISSIONS

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1 OPTIMAL MISSION ANALYSIS ACCOUNTING FOR ENGINE AGING AND EMISSIONS M. Kelaidis, N. Aretakis, A. Tsalavoutas, K. Mathioudakis Laboratory of Thermal Turbomachines National Technical University of Athens 1

2 OPTIMAL MISSION ANALYSIS ACCOUNTING FOR ENGINE AGING AND EMISSIONS Mission Analysis Model General Description Flight Mechanics-Equations Sub Models Example Application Optimization of Flight Trajectory Problem Definition Optimization Method Optimization Scenarios Pollutant Emissions Estimation Discussion 2

3 OPTIMAL MISSION ANALYSIS ACCOUNTING FOR ENGINE AGING AND EMISSIONS Mission Analysis Model General Description Flight Mechanics-Equations Sub Models Example Application Optimization of Flight Trajectory Problem Definition Optimization Method Optimization Scenarios Pollutant Emissions Estimation Discussion 3

4 Mission Analysis Model CAMACM: Commercial Aircraft Mission Analysis Computational Model. Covers all segments of a modern commercial aircraft typical flight: taxi, take off, climb, cruise, descent and approach It analyses the trajectory (in X-Z X Z plane) of the aircraft, by using the basic Flight Mechanics longitudinal equations of quasi-equilibrium between the applied forces. It allows the analysis of a variety of possible missions within the limits of safety and traffic regulations. (inputs: mission length, payload and fuel, cruise altitude and velocity, climb and descent desired trajectory, Engine degradation level) It delivers the overall mission results: aircraft trajectory, engines operating points along the mission, burned fuel and flight duration, Pollutant emissions production during flight. 4

5 OPTIMAL MISSION ANALYSIS ACCOUNTING FOR ENGINE AGING AND EMISSIONS Mission Analysis Model General Description Flight Mechanics-Equations Sub Models Example Application Optimization of Flight Trajectory Problem Definition Optimization Method Optimization Scenarios Pollutant Emissions Estimation Discussion 5

6 d( m U) dm du Σ F = F+ W + L+ D= = U+ m dt dt dt Flight Mechanics-Equations 2 Fcosθ i 0 0.5ρiSCL Ui sinθ + + mg 2 Fsinθ i i i 0.5ρiSCL Ui cosθ 2 0.5ρiSCD Ui cosθ Ui cosθ m Ui+ 1 Uicosθ i X W 2 f 0.5ρ U δt iscd Ui sinθ i sinθ Ui+ 1 U Z i sinθ + = + 6

7 OPTIMAL MISSION ANALYSIS ACCOUNTING FOR ENGINE AGING AND EMISSIONS Mission Analysis Model General Description Flight Mechanics-Equations Sub Models Example Application Optimization of Flight Trajectory Problem Definition Optimization Method Optimization Scenarios Pollutant Emissions Estimation Discussion 7

8 Sub Models (I) ATMOSPHERE: provides the ambient conditions during the flight (International Standard Atmosphere-ISA) AERODYNAMICS: generic aircraft aerodynamic model, comprises a set of drag polar curves C D =F(C L ) for a variety of typical High Lift Devices settings. It also takes into account the flight Mach number and the ground effect. ENGINE: numerical performance model of a modern high by-pass turbofan engine, (adapted to GE-SNECMA CFM56-3C1 using ICAO databank). can handle engine degradation through the use of Engine Condition Parameters (ECP) can be used to simulate the effects of engine components degradation (compressors, turbines) on overall performance. 8

9 Sub Models (II) Fuel Flow (kg/sec) Engine Model ICAO Data %max.thrust SLS Comparison of predicted (engine model) and ICAO published data 9

10 OPTIMAL MISSION ANALYSIS ACCOUNTING FOR ENGINE AGING AND EMISSIONS Mission Analysis Model General Description Flight Mechanics-Equations Sub Models Example Application Optimization of Flight Trajectory Problem Definition Optimization Method Optimization Scenarios Pollutant Emissions Estimation Discussion 10

11 Example Application Specific Fuel Consumption (kg/knh) Turbine Inlet Temperature ( Κ) take-off Engine Operation Time (min) take-off climb Reference Degraded climb Degraded Reference cruise cruise Engine Operation Time (min) Engine Speed (rpm) take-off Engine Operation Time (min) Distance Flight Altitude Cruise Speed Payload Fuel boarded Indicative Results climb Fuel Burned Reference Degraded Reference 2000 km (1080 nm) feet (constant) M0.8 (constant) 12.6 tons (120 pax + 5 crew) 7 tons (reserves incl.) 4777 kg Fuel Burned Degraded 4942 kg (+3.5%) cruise A typical mission for different engine conditions 11

12 OPTIMAL MISSION ANALYSIS ACCOUNTING FOR ENGINE AGING AND EMISSIONS Mission Analysis Model General Description Flight Mechanics-Equations Sub Models Example Application Optimization of Flight Trajectory Problem Definition Optimization Method Optimization Scenarios Pollutant Emissions Estimation Discussion 12

13 Optimization Of Flight Trajectory Variable Optimization Variables Initial value Upper constraint Lower constraint THETA0 (deg) CLICO CRFL (ft.) CRSP (Mach) Theta0: Climb gradient CLICO: Climb coefficient CRFL: Cruise Flight Level CRSP: Cruise Speed Optimization Procedure 13

14 OPTIMAL MISSION ANALYSIS ACCOUNTING FOR ENGINE AGING AND EMISSIONS Mission Analysis Model General Description Flight Mechanics-Equations Sub Models Example Application Optimization of Flight Trajectory Problem Definition Optimization Method Optimization Scenarios Pollutant Emissions Estimation Discussion 14

15 Optimization Method Minimization of a formulated cost function Fuel CF = Cw + C Fuel w 1 2 ini Time Time In the presented applications: only total fuel consumption was considered (No available data for time related costs) Minimization Method: Simplex Downhill Method in Multi- dimensions ini Cost Function Iterations Convergence history for a typical optimization case 15

16 OPTIMAL MISSION ANALYSIS ACCOUNTING FOR ENGINE AGING AND EMISSIONS Mission Analysis Model General Description Flight Mechanics-Equations Sub Models Example Application Optimization of Flight Trajectory Problem Definition Optimization Method Optimization Scenarios Pollutant Emissions Estimation Discussion 16

17 Optimization Scenario 1: Engine Deterioration Level Altitude (ft) % impoved Reference Degraded Specific Fuel Consumption (kg/knh) Reference Degraded 1% improved Turbine Inlet Temperature ( Κ) Distance covered (km) 1% improved Reference Degraded Engine Operation Time (min) Engine Operation Time (min) Mission lenght:1500 km, TOW= 58.8 tons, different engine conditions Engine Conditions CRFL (ft.) Optimized Values CRSP (Mach) THETA0 (deg) CLICO Degraded Reference Improved

18 Optimization Scenario 2: Mission Length Medium TOW= 58.8 tons, different mission lengths Altitude (ft) Short Long Engine Operation Time (min) Mission Length CRFL (ft.) Optimized Values CRSP (Mach) THETA0 (deg) CLICO A: 500 km B:1500 km C:2500 km Medium (B) and Long trip (C) differ only in climb phase with a steeper s climb for the second one. Short trip (A) demands both lower flight altitude and speed These results are very close to typical cruise speeds and altitudes for medium- short flights 18

19 Optimization Scenario 3: Take-Off Weight Cruise Mach Optimum Initial Flight path angle Optimum LONG trip SHORT trip Take-Off Weight 10.5 LONG trip SHORT trip Take-Off Weight Cruise Altitude Optimum Take-Off Weight LONG trip SHORT trip Two mission lengths for different TOWs Long Mission: optimum cruise speed not affected, small dependency for flight altitude Short mission: cruise speed increases while altitude remains almost constant. For both missions optimum climb angle reduces with TOW 19

20 OPTIMAL MISSION ANALYSIS ACCOUNTING FOR ENGINE AGING AND EMISSIONS Mission Analysis Model General Description Flight Mechanics-Equations Sub Models Example Application Optimization of Flight Trajectory Problem Definition Optimization Method Optimization Scenarios Pollutant Emissions Estimation Discussion 20

21 Pollutant Emissions Estimation A. NOx Correlation B. CO, UHC Correlations Sullivan s s correlation T 3 C 0.5 C NOx = C P e far C Is adapted to specific engine using available measurements (in the present case: ICAO databank) Döpelheuer s correlations m air T P 3 3, ref EICO, EIUHC = f 1.8 ( T3 300 P ) T 3 e 3, ref P 3 C Adapted correlation Initial correlation ICAO Data These correlations evaluate emissions during flight, based on adaptation to ground level emissions (as for example, those provided at the ICAO databank). EINOx %max.thrust SLS The emissions evaluation module is interconnected to the engine module, to produce emissions data for every point of missions studied. 21

22 Emissions Production Rate During Flight Nox, CO flow (g/sec) and Fuel flow per engine (kg/min) climb NOx Fuel cruise UHC descent UHC flow (g/sec) Distance Flight Altitude Cruise Speed Payload Fuel boarded 1000 km (540 nm) feet (constant) M0.78 (constant) 120 pax + 5 crew 7 tons (reserves incl.) 0 CO Engine Operation Time (min) Warm-up / Taxi / Descent: CO/UHC emissions at very high levels, compared to climb/cruise (4:1 and 10:1). NOx emissions large for higher power settings (take-off (40-45g/s) 45g/s) / initial climb(20-30g/s)), while very small during cruise (3g/s). This NOx distribution affects a lot more the departure airport vicinity and the lower atmosphere (first 5 minutes of climb) than the high altitude level (cruise). 22

23 OPTIMAL MISSION ANALYSIS ACCOUNTING FOR ENGINE AGING AND EMISSIONS Mission Analysis Model General Description Flight Mechanics-Equations Sub Models Example Application Optimization of Flight Trajectory Problem Definition Optimization Method Optimization Scenarios Pollutant Emissions Estimation Discussion 23

24 Discussion (I) The presented mission analysis model is a useful tool.. A variety of investigations can be carried out: Altering the set of mission parameters, in order to examine the effect on the aircraft and engines performance. Optimization analysis, for a given aircraft s s operation on various missions profiles, or compare different aircrafts best adaptation to the special characteristics cteristics of a single mission. Conducting large scale investigations, concerning fuel conservation and civil aviation s environmental impact, by using the appropriate input data. Performing a preliminary fleet management investigation, regarding the variation of each individual aircraft s s engines condition. Attaining a better understanding of the modern flight mechanics and aero-engines engines operation through a realistic comprehensible mission s s simulation. Analyze the Green Flight scenario; that is flight trajectory optimization primarily aiming on pollutant emissions and CO 2 reduction. 24

25 Discussion (II) The engine model employed is an independent module,, externally supplied (flexibility, studies of future engine technologies). The proposed mission analysis method requires small time-steps and thus a large number of iterations. The computational time can be significantly reduced to a few msecs per mission (very important for optimization), using engine performance data stored into memory (the accuracy penalty is less than 0.5%). All modules have been integrated in a single software package with a user friendly interface. 25

26 Discussion (III) 26

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