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Examples & Uses of Jets Pitot & Static Probes - Summary EML 4304L. JSF - STOVL Version. Boeing X-32 (CDP) USMC Version*. Lockheed-Martin X-35 (CDP) USMC Version*. * Images obtained from the Official US Government, DOD, JSF Site. Examples & Uses of Jets. - PowerPoint PPT Presentation
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F. S. [email protected]
JSF - STOVL Version
Lockheed-Martin X-35 (CDP)USMC Version*
Boeing X-32 (CDP)USMC Version*
* Images obtained from the Official US Government, DOD, JSF Site
F. S. [email protected]
Jet Entrainment Flow
Hot Gas Ingestion into inlet
Fountain Upwash Flow
Ground Erosion Region
Ground Plane
Jet Impingement Region
Lifting-Jet Flow
Wall-Jet Flow
Unsteady StructuralLoads and Lift Loss
Jet Entrainment Flow
Hot Gas Ingestion into inlet
Fountain Upwash Flow
Ground Erosion Region
Ground Plane
Jet Impingement Region
Lifting-Jet Flow
Wall-Jet Flow
Unsteady StructuralLoads and Lift Loss
Jet Entrainment Flow
Hot Gas Ingestion into inlet
Fountain Upwash Flow
Ground Erosion Region
Ground Plane
Jet Impingement Region
Lifting-Jet Flow
Wall-Jet Flow
Unsteady StructuralLoads and Lift Loss
Wall-Jet Flow
Unsteady StructuralLoads and Lift Loss
Ground Effect for a STOVL aircraft in hover
Examples & Uses of Jets
F. S. [email protected]
Supersonic Inlets & Diffusers
(http://www.grc.nasa.gov/WWW/K-12/airplane/lowsup.html)
Micro-nozzles
400 m
200 m
50 m
HumanHair
100 m
Inlet pressure hole
Pressure tap hole
Settling chamber
(Supersonic) Microjets
Converging/Sonic Micro- nozzles C-D Micro-nozzles
F. S. [email protected]
F. S. [email protected]
400 m ; PO~ 120 Psi
200 m ; PO~ 120 Psi
100 m ; PO~ 100 Psi
Flow Visualization Results
Supersonic Microjets
F. S. [email protected]
Supersonic JetsMach 2 Rectangular Jets
Sonic Round jet (0.4 mm)
Vectored Rectangular Jets
Mach 2 Round vectored Jet (~30 mm)
F. S. [email protected]
Summary of (some) Fluids Concepts Learned in 3015C (cont’d)
Conservation of Momentum - If viscosity is neglected:
Euler’s Equation
Integrate Euler’s equation along a streamline to obtain Bernoulli’s Equation It is only valid for : incompressible fluids, steady flow along a streamline, no energy loss due to friction, no heat transfer
Conservation of Energy - If energy is added, removed or lost via pumps turbines, friction, etc.then we use the energy equation or Extended Bernoulli’s Equation:
Constant 22 2
222
1
211 gz
Vpgz
Vp
Flow work + kinetic energy + potential energy = constant
2
222
1
211
22 z
g
Vphhhz
g
VpLEA
Where hA , hE is work done by or on the systems, e.g turbines, pumps, etc. and hL isFrictional Head Loss where
g
V
D
Lf
D
L
gh w
L 2
4 2
F. S. [email protected]
Pitot probes
Constant 22 2
222
1
211 gz
Vpgz
Vp
At station 1, the fluid is moving: P1 = Pstatic OR simply Ps V1 = V
At station 2, the fluid is rest: P2 = Ppitot OR Ptotal OR Pstognation OR P0 and V2 = 0 (fluid is at rest)
Hence, Bernoulli’s Equation is reduced to:
1 2
Constant 2
2
pitotpVp
