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