Experiments with Pintle Injector Design and Development

Nardi, Rene; Perez, Vladia; Pimenta, Amílcar Porto

doi:10.2514/6.2015-3810

Cited by 6 publications

(3 citation statements)

References 1 publication

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“…They discovered that the SMD value becomes lower when the radial opening distance decreases and the Weber number increases. At Minas Gerais Federal University in Brazil, various combinations were used to determine the injection patterns of radial and annular flows, and the basic spray conditions of a prototype injector for a 1 KN engine [12]. At China's National University of Defense Technology, a numerical analysis was performed to investigate the effects of pintle injector geometry on the combustion chamber's internal combustion field.…”

Section: Introductionmentioning

confidence: 99%

Simulation Analysis of the Effect of Slit/Slot Pintle Geometry on Atomization of Bipropellant Engine

Cai,

Zhang,

Wang

et al. 2023

Processes

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In order to optimize the slit/slot geometry design of a bipropellant pintle injector, the impinging spray development of a pintle injector was numerically investigated. The VOF (volume of fluid) and LES (large eddy simulation) methods were employed for an analysis to capture the gas–liquid interface by means of the AMR (adaptive mesh refinement) method. In those simulation cases, different flowrates, slot numbers, pintle diameters, slot thicknesses and slot shapes were compared for an analysis. In a comparison of visualization and quantification, a high flowrate and large pintle diameter were shown to be more positive features for improving the atomization quality and mixing effect. As for the slot parameters and shape, the spray development was mainly determined by the flow proportion between the slit jet and slot jet. The simulation results indicated that dominant slot jets cause a more dispersed spatial distribution, which is more conducive to the subsequent improvement of combustion efficiency in a limited space. However, an excessive increase in the number of slot jets can weaken the overall atomization quality and mixing effect, so it is suggested to ensure a balance for geometry design optimization.

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Section: Introductionmentioning

confidence: 99%

Simulation Analysis of the Effect of Slit/Slot Pintle Geometry on Atomization of Bipropellant Engine

Cai,

Zhang,

Wang

et al. 2023

Processes

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show abstract

“…Sakaki et al (2015) and Sakaki et al (2018) used the ethanol/liquid oxygen pintle injector to evaluate the performance of a rocket engine. Nardi et al (2015) also designed a pintle injector engine and conducted experiments. Min et al (Son et al, 2015) experimentally studied the effects of momentum ratio and Weber number on the spray angle.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Spray Characteristics With Upstream Flow Pulsation of a Pintle Injector

Xie

Nie²,

Gao³

et al. 2022

Front. Aerosp. Eng.

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The volume of fluid (VOF) model and the adaptive mesh refinement (AMR) method are used to study the spray characteristics of a gas–liquid pintle injector and the effects of mass flow pulsation of liquid on it. A pintle injector is a thrust adjusting device that changes the injection area using movable parts. Pressure pulsation in the supply pipeline is simulated by periodically changing the mass flow rate of the inlet. Spray characteristics with constant and pulsating upstream flows are compared with each other. The effect of frequency and amplitude of upstream liquid flow pulsation on the spray performance was studied. The results reveal that holding the mass flow rate of the upstream liquid flow constant, under the impact of gas flow, the liquid block, the liquid filament, and a large number of small droplets are peeled off from the liquid film. The film breakup position stays relatively fixed, and the spray has a conical shape. However, when the upstream liquid flow is pulsating, the film breakup position changes periodically, and the spray has a “Christmas tree”-shape. The pulsation frequency has little effect on the spray angle. But it strongly determines the droplet size and the spatial distribution of the spray. In addition, the pulsation amplitude can enhance the phenomenon of “Christmas tree.” With the increase in pulsation amplitude, the liquid film at the outlet of the pintle injector appears with a periodic phenomenon of “contraction–expansion.”

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“…The pintle injector is a typical cross flow type liquid-liquid, liquid-gas or gas-gas injector (Nardi and Pimenta, 2015). There is an annular gap through which one liquid flows through the surface of the pintle's main body to its top and forms a liquid annular sheet of specified thickness in the axial direction.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the morphology of a liquid-liquid pintle injector element primary breakup spray

Zhou

Shen

Jin

2020

J. Zhejiang Univ. Sci. A

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Primary breakup in a liquid-liquid pintle injector element at different radial jet velocities is investigated to elucidate the impingement morphology, the formation of primary breakup spray half cone angle, the pressure distribution, the liquid diameter distribution, and the liquid velocity distribution. With a sufficient mesh resolution, the liquid morphology can be captured in a physically sound way. A mushroom tip is triggered by a larger radial jet velocity and breakup happens at the tip edge first. Different kinds of ligament breakup patterns due to aerodynamic force and surface tension are captured on the axial sheet. A high pressure core is spotted at the impinging point region. A larger radial jet velocity can feed more disturbances into the impinging point and the axial sheet, generate stronger vortices to promote the breakup process at a longer distance, and form a larger spray half cone angle. Because of the re-collision phenomenon the axial sheet diameter does not decrease monotonically. The inner rim on the axial sheet shows a larger diameter magnitude and a lower velocity magnitude due to surface tension. This paper is expected to provide a reference for the optimum design of a liquid-liquid pintle injector.

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Experiments with Pintle Injector Design and Development

Cited by 6 publications

References 1 publication

Simulation Analysis of the Effect of Slit/Slot Pintle Geometry on Atomization of Bipropellant Engine

Simulation Analysis of the Effect of Slit/Slot Pintle Geometry on Atomization of Bipropellant Engine

Numerical Investigation on Spray Characteristics With Upstream Flow Pulsation of a Pintle Injector

Numerical study on the morphology of a liquid-liquid pintle injector element primary breakup spray

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