P&W Expectations for QAT • AST was a successful NASA/Industry program,
provides a blueprint for QAT• QAT is funded at 1/2 of AST Noise Element, that has an impact on expectations• The engines make most of the noise, therefore engine noise-reduction technology will be at least 50% of QAT• There is a parallel NASA UEET engine program, QAT and UEET will be tightly integrated• AST Engine Noise/Propulsion Elements focussed on noise/NOX, QAT/UEET will focus on noise/NOX/CO2/GCC, thus increased emphasis on reducing fuel burn
W. K. Lord 4/11/00
NASA Technology Programs Have Led the Wayto Significant Noise Reduction
777-200
A330-300
MD-90-30
MD-11
A320-200
747-400
A300-600R
767-300ERA310-300757-200
MD-87MD-82
B-747-300A300B4-620
A310-222
MD-80
B-747-200
B-747-SPDC-10-40
B-747-200
A300
B-747-200
B-747-100
B-737-200B-737-200
B-727-200
DC9-10
B-727-100
B-727-100
-60.0
-50.0
-40.0
-30.0
-20.0
-10.0
0.0
10.0
20.0
30.0
40.0
1960 1970 1980 1990 2000 2010 2020
Year of Certification
Cum. NoiseMarginrelative
toChapter 3
(EPNdB)
XXX/PW8060
YYY/PW8033
A318/PW6000(est)777/GE90
8D ReFan
NASA BASE R&T LET
AST
QAT QATGoalQATGoal
ASTGoalASTGoal
Low SpeedFan
High SpeedTurbine
…Enabler For Ultra-high Bypass Ratio Engines
Fan Drive Gear SystemReduces Noise By Reducing Fan Tip Speed...
Geared Fixed-Pitch Fan with Variable NozzlePotential PW Focus for QAT/UEET Program
High-BPR Cyclebenefits fan & jet noise
Engine Component Technologyairfoil count optimization (fan,LPC,LPT)airfoil 3D geometryairfoil wake management
Nacelle/Installation Technologyadvanced acoustic linersscarf inletvariable-area fan nozzlecontoured core nozzleLWT, HWT, or BWB airframe
Acoustic Response and Radiation Model
LES Flow Field, Axisymmetric Jet
CAA Technology Level Today Is Where CFD Was In 1980
Computational Aero-acoustic ModelingPhysics-based Tool Revolutionizing Acoustic
Technology DevelopmentFan Noise:
• Fan Rotor / Stator Interaction Tone Noise
• Fan Broadband Noise Model
Jet Noise:
• Near Term Methods based on Reynolds-avg CFD
• Longer Term: Large-Eddy Simulation (LES)
QAT Program Content
• Yr 2000 system studies -set technical direction
• Technology development/ demonstration -model scale e.g. 22” fan rig in 9x15 jet noise in NATR -full scale demo (UEET engine)
• core & turbomachinery (LPC/LPT) noise
• computational methods development