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US 8,955,303 B2Granted
Pulse detonation system
AssigneeGeneral Electric Company
InventorsBrian Gene Brzek, Adam Rasheed, Narendra Digamber Joshi
Life of this patent
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Abstract
In one embodiment, a pulse detonation system includes a pulse detonation tube including a base tube and a thermally protective layer disposed adjacent to an inner surface of the base tube. The thermally protective layer is configured to limit temperature fluctuations at the inner surface of the base tube to less than approximately 20 degrees Celsius during operation of the pulse detonation system, and the thermally protective layer does not comprise a ceramic coating.
Claims9
A pulse detonation system, comprising:
- a pulse detonation tube comprising a base tube and a thermally protective layer disposed adjacent to an inner surface of the base tube, wherein the thermally protective layer is configured to limit temperature fluctuations at the inner surface of the base tube to less than approximately 20 degrees Celsius during operation of the pulse detonation system, and wherein the thermally protective layer does not comprise a ceramic coating, and wherein a thickness of the thermally protective layer is greater than a penetration depth of heat from a detonation reaction within the pulse detonation tube, and wherein the penetration depth x is obtained according to formulae:
- x
- ∝
- k
- ρ
-
-
- c
- p
-
- t
- ,
- or
-
-
- x
- ∝
- α
-
-
- t
- ,
- or
-
-
-
- x
- ∝
- hL
- c
-
- t
- ρ
-
-
- c
- p
-
- Bi
- where t is exposure time to a detonation wave, h is a heat transfer coefficient Lc is characteristic length, α is thermal diffusivity, k is thermal conductivity, ρcp is volumetric heat capacity, and Bi is Biot number.
37 more elements
Dependencies are inferred from the claim text.