# Presentation: 233779

## 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 Wayto Significant Noise Reduction

- <date/time>

***NASA Technology Programs Have Led the Way******to Significant Noise Reduction***

- 777-200

- A330-300

- MD-90-30

- MD-11

- A320-200

- 747-400

- A300-600R

- 767-300ER

- A310-300

- 757-200

- MD-87

- MD-82

- B-747-300

- A300B4-620

- A310-222

- MD-80

- B-747-200

- B-747-SP

- DC-10-40

- B-747-200

- A300

- B-747-200

- B-747-100

- B-737-200

- B-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. Noise**
**Margin**
**relative**
**to**
**Chapter 3**
**(EPNdB)**

- XXX/PW8060

- YYY/PW8033

- A318/PW6000(est)

- 777/GE90

**8D ReFan**

**NASA BASE R&T**

**LET**

**AST**

**QAT**

**QAT**
**Goal**

**AST**
**Goal**

## Fan Drive Gear SystemReduces Noise By Reducing Fan Tip Speed...

- Low Speed
- Fan

- High Speed
- Turbine

*...**Enabler For Ultra-high Bypass Ratio Engines*

**Fan Drive Gear System*****Reduces Noise By Reducing Fan Tip Speed...***

## Geared Fixed-Pitch Fan with Variable Nozzle

_**Geared Fixed-Pitch Fan with Variable Nozzle**_
- Potential PW Focus for QAT/UEET Program

-     _High-BPR Cycle_
- benefits fan & jet noise

- _Engine Component Technology_
- airfoil count optimization (fan,LPC,LPT)
- airfoil 3D geometry
- airfoil wake management

- _Nacelle/Installation Technology_
- advanced acoustic liners
- scarf inlet
- variable-area fan nozzle
- contoured core nozzle
- LWT, HWT, or BWB airframe

## Computational Aero-acoustic ModelingPhysics-based Tool Revolutionizing Acoustic Technology Development

- Acoustic Response and Radiation Model

- LES Flow Field, Axisymmetric Jet

- CAA Technology Level Today Is Where CFD Was In 1980

**Computational Aero-acoustic Modeling*****Physics-based Tool Revolutionizing Acoustic Technology Development***

- _Fan 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