Experimental Study of High-Frequency Fluidic Valve Injectors for Detonation Engine Applications

Peace, James T.; Joshi, Dibesh D.; Lu, Frank K.

doi:10.2514/6.2014-1318

Cited by 10 publications

(10 citation statements)

References 4 publications

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“…As seen in Fig. 5, a time-varying outlet boundary condition is set at 𝑡 = 10 µs to mimic the pressure profile of an impulsive, high-pressure wave traversing an injector orifice and assumes the shape of an exponential decay function [2,10,11]. A time-step size of 1×10 −7 seconds was found to be sufficient for a converged solution with 20 iterations per time-step.…”

Section: Transient Back-flow Recovery Modelmentioning

confidence: 99%

High-diodicity impinging injector design for rocket propulsion enabled by additive manufacturing

Keller

Otomize

Nair

et al. 2022

AIAA SCITECH 2022 Forum

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This work examines novel impinging injector designs enabled by additive manufacturing that reduce forward pressure loss while maintaining high relative back-flow resistance (diodicity). A steady, non-reacting computational fluid dynamics (CFD) model is used to assess the hydraulic characteristics of fluidic diode features in a liquid bi-propellant impinging doublet-type injector configuration relevant to rocket propulsion applications. A design trade study is conducted to determine an effective fluidic diode feature to be implemented within the injector elements, constrained by practical considerations for additive manufacturing. Noteworthy increases in diodicity are achieved within the constraints of producibility relative to conventional designs. A complimentary transient, multiphase CFD model is used to evaluate propellant backflow behavior when subject to a high-pressure impulse within a downstream chamber. Preliminary results suggest that the diodicity is a relevant predictor of transient performance as injector stiffness decreases.

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Section: Transient Back-flow Recovery Modelmentioning

confidence: 99%

High-diodicity impinging injector design for rocket propulsion enabled by additive manufacturing

Keller

Otomize

Nair

et al. 2022

AIAA SCITECH 2022 Forum

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“…One of the primary challenges is the lack of traditional solenoid valves capable of operating at such high frequencies [10]. To address this issue, a valveless injector has been proposed to utilize gas-dynamic processes to serve the function of a valve [9,11]. The valveless injector, also known as a fluidic-valve injector, consists of an injection orifice open to a detonation tube and a recessed cavity with its base connected to the propellant feed line.…”

Section: Introductionmentioning

confidence: 99%

Computational Study of Fluidic-Valve Injectors for Detonation Engines

Small,

Zhang

2024

Aerospace

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The performance of detonation engines depends on propellant injectors. This study investigates a fluidic-valve injector mounted to a detonation tube. The injector is equipped with a recessed cavity connecting to the fuel plenum. After verifying the theoretical and numerical framework, three cases (I, II, and III) are analyzed, each representing different combinations of initial injector conditions and fuel supply setups. In all cases, a detonation wave is initiated near the headend of the detonation tube. It propagates through the initial section of the tube and undergoes diffraction and deformation at the flush-wall orifice. Among the considered cases, Case III, featuring a pre-pressurized initial injector flowfield and a total-pressure-inlet boundary, demonstrates the best agreement with the experimental results. It reveals a strong interaction between the longitudinally traveling detonation wave and the transverse propellant plume expanding from the orifice, causing the detonation wave to split. One part continues within the tube, while the other diffracts into the injector, creating a recirculation zone. Shock waves propagate within the injector and reflect at the base of the cavity, generating pressure spikes similar to the experimental observations. However, the contact surface separating the burnt products and fresh propellant reaches only a limited distance into the injector, suggesting a short interruption time and rapid recovery of the propellant supply.

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“…al. 7 experimentally studied a high rate fluidic valve concept driven by a pulsed detonation engine. This valve showed some interactions between fresh reactants and pressure feedback into a cavity.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of a Rotating Detonation Engine Injector Temporal Response

Naples

Hoke

Schauer

2015

53rd AIAA Aerospace Sciences Meeting

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An existing rotating detonation engine is modified to allow access to the fuel injection counterbores near the injection point. Fuel feed pressure and flow velocity are temporally resolved and analyzed to determine coupling between the detonation channel and feed system. Results show that the detonation wave affects the injector feed resulting in flow variation throughout operation. Frequency analysis shows that the fuel plenum has a dynamic response that can differ from the detonation passing frequency. Further measurement technique improvements are needed to draw quantitative fuel flow injection profiles. Nomenclature= hot film surface area 1 = Nusselt correlation constant = hot film diameter ℎ = convection coefficient = hydrogen thermal conductivity = Nusselt correlation exponential constant = hydrogen viscosity = Nusselt number = plenum hydrogen pressure = Prandtl number ̇ = convective heat transfer = film electrical resistance = film Reynold's number = film temperature ∞ = plenum hydrogen temperature = voltage = flow velocity

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Experimental Study of High-Frequency Fluidic Valve Injectors for Detonation Engine Applications

Cited by 10 publications

References 4 publications

High-diodicity impinging injector design for rocket propulsion enabled by additive manufacturing

High-diodicity impinging injector design for rocket propulsion enabled by additive manufacturing

Computational Study of Fluidic-Valve Injectors for Detonation Engines

Experimental Investigation of a Rotating Detonation Engine Injector Temporal Response

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