Rocket engine system for realizing high-speed response
AssigneesIHI Corporation, Japan Aerospace Exploration Agency
InventorsHatsuo Mori, Yoshihiro Naruo, Shinichiro Tokudome, Tsuyoshi Yagishita, Takayuki Yamamoto, Yoshifumi Inatani
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Abstract
Disclosed is a turbo pump in which a pump impeller is connected to one end of a rotary shaft and a turbine is connected to the other end of the rotary shaft. The turbo pump is designed such that an equivalent region, between a turbine efficiency curve obtained on the basis of a conditional expression where the number of rotations of the rotary shaft is maintained constant regardless of a pump flow rate and a turbine efficiency curve of an actual machine, becomes an operation region.
Claims3
A turbo pump in which a pump impeller is connected to one end of a rotary shaft and a turbine is connected to the other end of the rotary shaft,
- wherein the turbo pump is designed to operate in an operation region that corresponds to an equivalent region,
- the equivalent region corresponding to a region where a difference between a turbine efficiency curve obtained on the basis of a conditional expression where the number of rotations of the rotary shaft is maintained constant regardless of a pump flow rate and a turbine efficiency curve of an actual machine is equal to or smaller than 5%, and
- the conditional expression is given as Expression (4) having turbine efficiency ηt, pump efficiency ηp, a head coefficient Ψ, a pump flow rate Q, the number of rotations Nc, turbine enthalpy drop ΔH, and turbine inlet fuel density ρ
- η
-
-
- t
-
- (
- Q
- /
- Nc
- )
- =
- Nc
- 2
-
- Ψ
-
- (
- Q
- /
- Nc
- )
- η
-
-
- p
-
- (
- Q
- /
- Nc
- )
-
- ρ
-
-
- Δ
-
-
- H
- .
- (
- 4
- )
A rocket engine comprising:
- a fuel turbo pump;
- and
- an oxidizer turbo pump,
- wherein the entire system including the fuel turbo pump is designed to operate in an operation region that, in at least the fuel turbo pump, corresponds to an equivalent region,
- the equivalent region corresponding to a region where a difference between a turbine efficiency curve obtained on the basis of a conditional expression where the number of rotations of the rotary shaft is maintained constant regardless of a pump flow rate and a turbine efficiency curve of an actual machine is equal to or smaller than 5%, and
- the conditional expression is given as Expression (4) having turbine efficiency ηt, pump efficiency ηp, a head coefficient Ψ, a pump flow rate Q, the number of rotations Nc, turbine enthalpy drop ΔH, and turbine inlet fuel density p
- η
-
-
- t
-
- (
- Q
- /
- Nc
- )
- =
- Nc
- 2
-
- Ψ
-
- (
- Q
- /
- Nc
- )
- η
-
-
- p
-
- (
- Q
- /
- Nc
- )
-
- ρΔ
-
-
- H
- .
- (
- 4
- )
Dependencies are inferred from the claim text.