SSME key operations demonstration

Anderson, Brian; Bradley, M.S.A.; Ives, Janet

doi:10.2514/6.1997-2686

Cited by 2 publications

(3 citation statements)

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“…As shown in Eq. (6), when the ratio of P c =P t is fixed, the mass flow rate is proportional to P t , differing from the relationship in the liquid injection. Based on Eq.…”

Section: Relationships In Throttlingmentioning

confidence: 99%

“…Throttling has been investigated and several engines were tested in deep and shallow throttled conditions. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] Throttling is also necessary for the rocket-based-combined-cycle engine (RBCC) to change its operation to the ramjet mode. 15) In the rocket engine, thrust is proportional to the combustion chamber pressure.…”

Section: Introductionmentioning

confidence: 99%

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Conceptual Study of Throttled Operation of Rocket Engine Turbopump

Kanda

2013

Trans. Japan Soc. Aero. S Sci.

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Throttled operation of turbopumps of liquid rocket engines is studied analytically. Two types of pressure drops in the propellant injector are examined, that is, the drop of gas injection and that of liquid injection. Circulation is examined in relation to throttling to operate the pump in the vicinity of the design condition. An enthalpy increase at the pump entrance is derived analytically in the circulation system. With the derived analytical relationships, throttled operating conditions are examined for imaginary LH 2 and LOX turbopumps with a LH 2 /LOX property calculation code. The circulation causes gasification at the entrance of the high-pressure LH 2 pump. This does not occur in the mid-pressure LH 2 pump or the LOX pump. In the liquid propellant injection system, the unstable region becomes narrower than in the gas propellant injection. The ratio of the turbine flow rate to the pump flow rate decreases in line with throttling. Throttling does not degrade the engine specific impulse from the viewpoint of the turbine bleed ratio.

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“…As shown in Eq. (6), when the ratio of P c =P t is fixed, the mass flow rate is proportional to P t , differing from the relationship in the liquid injection. Based on Eq.…”

Section: Relationships In Throttlingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Conceptual Study of Throttled Operation of Rocket Engine Turbopump

Kanda

2013

Trans. Japan Soc. Aero. S Sci.

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“…Cooperative Study -SSME (1997) 36,37 Under a joint cooperative agreement with the NASA MSFC, Boeing Rocketdyne in 1997 demonstrated offnominal power operation of the staged combustion cycle Space Shuttle Main Engine (SSME) for RLV evaluations of the X-33 demonstrator vehicle propulsion system. The SSME does not have a higher-than-usual pressure drop; however it is classified in this section because at low thrust it still maintains a high enough pressure drop to operate sufficiently.…”

Section: Nasa-boeing Rocketdyne Jointmentioning

confidence: 99%

Liquid-Propellant Rocket Engine Throttling: A Comprehensive Review

Casiano

Hulka

Yang

2009

45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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Liquid-Propellant Rocket Engines (LREs) are capable of on-command variable thrust or thrust modulation, an operability advantage that has been studied intermittently since the late 1930s. Throttleable LREs can be used for planetary entry and descent, space rendezvous, orbital maneuvering including orientation and stabilization in space, and hovering and hazard avoidance during planetary landing. Other applications have included control of aircraft rocket engines, limiting of vehicle acceleration or velocity using retrograde rockets, and ballistic missile defense trajectory control. Throttleable LREs can also continuously follow the most economical thrust curve in a given situation, compared to discrete throttling changes over a few select operating points. The effects of variable thrust on the mechanics and dynamics of an LRE as well as difficulties and issues surrounding the throttling process are important aspects of throttling behavior. This review provides a detailed survey of LRE throttling centered around engines from the United States. Several LRE throttling methods are discussed, including high-pressure-drop systems, dual-injector manifolds, gas injection, multiple chambers, pulse modulation, throat throttling, movable injector components, and hydrodynamically dissipative injectors. Concerns and issues surrounding each method are examined, and the advantages and shortcomings compared. Nomenclature LRE= Liquid-Propellant Rocket Engine

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SSME key operations demonstration

Cited by 2 publications

References 0 publications

Conceptual Study of Throttled Operation of Rocket Engine Turbopump

Conceptual Study of Throttled Operation of Rocket Engine Turbopump

Liquid-Propellant Rocket Engine Throttling: A Comprehensive Review

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