Throttling venturi valves for liquid rocket engines

Harvey, D. W.

doi:10.2514/6.1970-703

Cited by 12 publications

(9 citation statements)

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“…Only a few publications consider variable area cavitating venturis as mass flow controllers for throttling engines. the study in ref [5] describes cavitating venturi valves used in the lunar module descent engine (LMDe). However, this valve design can work in the cavitation zone over a throttle range of 10%-65% rPL and non-cavitating from 65% to maximum thrust.…”

Section: State Of the Artmentioning

confidence: 99%

Cavitating Venturi as a Mass Flow Controller in a Deep Throttling Liquid Rocket Engine

Sekrecki

2023

Transactions on Aerospace Research

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The most common solutions for rocket engines are the single operation point (thrust level) units. Oxidiser and fuel mass flow rates and the oxidiser-to-fuel mass flow rate ratio (OFR) are some of the determinants of the thrust level. Based on these, planetary ascent and descent; space rendezvous; orbital manoeuvring, including orientation and stabilisation in space; hovering, hazard avoidance during planetary landing; and ballistic missile trajectory control propulsion systems could use throttleable liquid engines. Several engine throttling methods, such as supply pressure variation and variable injector area, can be applied. Among others, a cavitating venturi propellant regulatory valve is one of the most promising throttling method. This type of valve can provide steady mass flow, despite the downstream pressure disturbance (i.e. from the combustion chamber), which sustains a stable engine thrust as the mass flow is kept. The article presents the valve sizing method, design and prototype test results of the cavitating venturi valve that has potential for utilisation in a deep throttling rocket engine. Mass flow stability and repeatability are presented for valve operating points in the 10%–110% nominal mass flow range. Valve design optimisation, based on CFD, to sustain cavitation for a higher downstream-to-upstream pressure ratio is shown.

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Section: State Of the Artmentioning

confidence: 99%

Cavitating Venturi as a Mass Flow Controller in a Deep Throttling Liquid Rocket Engine

Sekrecki

2023

Transactions on Aerospace Research

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“…Masses of relevant literatures have shown that this method is theoretically feasible. Harvey (1970), and Huzel and Huang (1992) indicated that the venturi used in the rocket propulsion system can control the fuel flow accurately at the cavitation operation. The propellant mass flow rate maintains at a constant when the pressure ratio reduces to a critical value even the downstream pressure changes rapidly due to the start-up transient or combustion oscillation (Abedini et al 2014;Zhu et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Agent Precise Quantitative Control for Foam Technology with Cavitation Jet

2021

JAFM

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A reliable agent addition control is crucial for the foam technology that is prevalent in many industrial fields. The objective of this paper is to reveal the precise quantitative control mechanism and distinctive performance of cavitation jet. The cavitation evolution suction process is analyzed by the vapor appearance order defined.A 5-6 mm vapor-liquid transition interface is found in the cavitation jet with a remarkable mutation in fluid pressure, density and velocity. The vapor region in the jet device decreases and the maximum vapor volume fraction declines from 96.4% to 0 as the pressure ratio increases. The precise quantitative control is realized by the cavitation jet at the negative pressure less than -87 kPa in the suction port. The absorption amount decreases with the absorbed liquid viscosity increasing and a various level of precise quantitative control is achieved by the orifice plate area. The relation between the absorption amount and plate area is quadratic curve. Furthermore, the dust suppression practical was successfully conducted in a coal bunker to verify the effectiveness of foam technology using cavitation jet. Based on the above contribution, it is believed that the proposed precise quantitative control method has a strong applicability and popularization in industrial control field.

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“…When used in the rocket propulsion system, it can keep the propellant mass flow rate fixed even though the downstream pressure changes rapidly due to the start-up transient or combustion oscillations [11,12]. Taking advantage of this characteristic, the cavitating venturi was used as flow controller and flow meter with a high degree of accuracy in a wide range of mass flow rate [13].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on liquid absorption of jet pump under operating limits

Wang

Shen

et al. 2015

Vacuum

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Throttling venturi valves for liquid rocket engines

Cited by 12 publications

References 0 publications

Cavitating Venturi as a Mass Flow Controller in a Deep Throttling Liquid Rocket Engine

Cavitating Venturi as a Mass Flow Controller in a Deep Throttling Liquid Rocket Engine

Investigation on the Agent Precise Quantitative Control for Foam Technology with Cavitation Jet

Experimental investigation on liquid absorption of jet pump under operating limits

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