Embed Size (px)
Citation preview
Gulfstream Proprietary Information
Gulfstream Aerospace Corporation
FAA Public Meeting – Supersonics
April 21, 2010 / Baltimore, MD
Photo: NASA Dryden Flight Research Center
An Overview of the GulfstreamAn Overview of the Gulfstream
Supersonic TechnologySupersonic Technology ProgramProgram
Gulfstream Proprietary Information
0.0
0.5
1.0
1.5
2.0
2.5
3.0
0 200000 400000 600000 800000
Initial Cruise Weight - lb
Initi
al S
hock
Stre
ngth
- ps
f Concorde
HSCT
SBJ
QSJ Shaped
QSJ Advanced Concepts
Initial Cruise Sonic Boom Strength
DARPA QSP Goal
• Advantages– Smaller Aircraft Reduced Sonic Boom– Lower Speed Less Complexity (Inlets, Materials, Etc.)
Civil Supersonics / Concorde is Gone – What Now?Civil Supersonics / Concorde is Gone – What Now?
• Gulfstream Perspective… Quiet Supersonic Jet (QSJ)
– Different Market• Business Jet: Speed is
Important & Affordable
– Different Requirements• High Speed Civil Transport: Mach 2.4, 600K airliner• Quiet Supersonic Jet: Mach 1.8, 100K transport
Better Chance at Enabling Acceptable Supersonic Civil AircraftBetter Chance at Enabling Acceptable Supersonic Civil Aircraft
Gulfstream Proprietary Information
QSJ
Redefining the Speed EnvelopeRedefining the Speed Envelope
Today’s Reality Tomorrow’s Vision
Manage Environmental Impacts Through Design RequirementsManage Environmental Impacts Through Design Requirements
Cruise Speed 0.90 M 1.80 M1.80 MEnvironmental Considerations Requirement• Boom Overpressure Acceptable for Overland SS Flight• Takeoff Emissions ICAO with Margin• Cruise Emissions Minimum Impact• Airport Noise Stage 4 with 10dB Margin
Gulfstream Proprietary Information
Supersonic Technology Development
Objective: Conduct basic research into reducing the impact of sonic boom on people and the environment to enable regulatory change for supersonic flight overland, domestically and internationally
Objective: Conduct basic research into reducing the impact of sonic boom on reducing the impact of sonic boom on people and the environmentpeople and the environment to enable regulatory change for supersonic flight overland, domestically and internationally
Gulfstream Proprietary Information
Sonic Boom SuppressionSonic Boom Suppression
• Gulfstream Quiet Spike™
– Extendable Nose Spike
– Generate Series Of Weak Shocks
– Propagate Parallel To Each Other
– Transform Sharp Crack Into Quiet Whisper Quiet Spike
Without Spike
NASA LaRC UPWT
0 0.05 0.1 0.15 0.2 0.25 0.3-2.0
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
Time (seconds)
Del
ta P
ress
ure
(psf
)
ConcordeSBJ w/ No ShapingQSJ w/ Quiet Spike
Gulfstream Proprietary Information
Excellent Correlation & Validation of Sonic Boom Suppression
Excellent Correlation & Validation of Sonic Boom Suppression
Near-field signature 95 ft. below aircraft
Quiet Spike
Flight TestQuiet Spike
Flight Test
Photo: NASA Dryden Flight Research Center
-0.06
-0.04
-0.02
0.00
0.02
0.04
0.06
0.08
-10 0 10 20 30 40 50 60 70 80 90 100Xcone ~ feet
P/
P
Probing Sig. #10 at D-av = 95 ft.3-D Hybrid CFD - Interpolated to #10
Comparison of CFD-Predicted vs. Measured Near-field Signature
Gulfstream Proprietary Information
50
55
60
65
70
75
80
85
90
95
100
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
PLdB
w/o
U-w
ave
AcceptabilityAcceptable 24/7
AbsolutelyNot AllowableMarginal
Acceptable Day Time Not Acceptable
< 70
PLd
B
50% Acceptance95% Acceptance
Low Boom Simulation & Preliminary Flight Results Independently Point Toward Signature Levels ~ 70 PLdB
Low Boom Simulation & Preliminary Flight Results Independently Point Toward Signature Levels ~ 70 PLdB
Preliminary Outdoor Loudness AssessmentNASA F-18 Low Boom Flight Test – October 2005
Boom Sound Levels
40
50
60
70
80
90
100
110
120
HSCT Concorde SBJ QSJ shaped QSJadvanced
QSJadvanced+
Configuration
dB
PLdBdB(A)
Talking
City Traffic
dB(A)>35dB Reduction
Boom Sound Levels
40
50
60
70
80
90
100
110
120
HSCT Concorde SBJ QSJ shaped QSJadvanced
QSJadvanced+
Configuration
dB
PLdBdB(A)
Talking
City Traffic
dB(A)>35dB Reduction
Gulfstream Signature Development & Simulation
Gulfstream Proprietary Information
Global Impact AssessmentGlobal Impact Assessment
Low Boom Signature Robust in Non-Standard
Atmosphere
Low Boom Signature Robust in Non-Standard
Atmosphere
0 0.05 0.1 0.15 0.2-0.8
-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
0.8
Time (sec)
Del
ta P
ress
ure
(psf
)
St. Helena Island (summ) 58.6 PL(dB)Oimakon, Russia (wint) 69.5 PL(dB)Std. Atm. 66.8 PL(dB)
50
60
70
80
90
100
110
PL
(dB
)
N-wave, 90 deg hdg, MN-wave, 90 deg hdg, JuN-wave, 90 deg hdg, SN-wave, 90 deg hdg, DN-wave, 270 deg hdg, MN-wave, 270 deg hdg, JuN-wave, 270 deg hdg, SeN-wave, 270 deg hdg, DeCase 432, 90 deg hdg,Case 432, 90 deg hdg,Case 432, 90 deg hdg,Case 432, 90 deg hdg,Case 432, 270 deg hdg,Case 432, 270 deg hdg,Case 432, 270 deg hdg,Case 432, 270 deg hdg,
110
100
90
80
60
50
70
Perc
eive
d Lo
udne
ss (P
LdB
)
0 20 40 60 80-20-40-60-80Latitude
QSJ, Std. Atm.: <70 PLdB
Concorde, Std. Atm.: >105 PLdB
Gulfstream Proprietary Information
Summary
• Continued Market / Industry Interest in Future Supersonic Concepts
– Supersonic Overland Flight is Required
– Manage Environmental Design Requirements for Success
• Promising Research Results in Sonic Boom Suppression
– Validated Quiet Spike Technology
– Acceptable Noise Level Achieved Through Low Boom Shaping
Quiet Spike Video
Gulfstream Proprietary Information
Questions ?Questions ?
