Evaluation of orifice inlet geometries on single liquid injectors through cold-flow experiments

Kiaoulias, Dimitris; Travis, T.A.; Moore, Jeffrey D.; Risha, Grant A.

doi:10.1016/j.expthermflusci.2019.01.009

Cited by 8 publications

(6 citation statements)

References 31 publications

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“…For a long injector, a relatively large injector length is required for supercavitation to occur; thus, the probability of hydraulic flip is relatively low. The flow can be separated from the wall more easily for a sharp-edged inlet than for a round-edged (chamfered-edge) inlet; thus, hydraulic flip occurs easily for a sharp-edged inlet [10,12,13]. An injector with a large taper angle behaves similarly to a divergent nozzle, and the probability of hydraulic flip is thus high [14,15].…”

Section: Experimental Results For Flow Rate Characteristicsmentioning

confidence: 99%

“…This result may be attributable to the slightly round-edged inlet of the injector with an L/D ratio of 3. The results of Kiaoulias et al [10] and Simplon and Ranade [12] indicated that C d was higher for a chamfered inlet than for a sharp-edged inlet.…”

Section: Characteristics Of the Discharge Coefficientmentioning

confidence: 95%

“…Moreover, it can cause material erosion and even injector failure [7]. Cavitation is affected by aspects such as the length-to-diameter (L/D) ratio of the injector nozzle [8,9], the injector's geometry [10][11][12][13][14][15], ambient pressure [16][17][18], and the properties of the fuel [19][20][21]. Many researchers have experimentally investigated these effects.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the spray angle was affected by the cavitation number and Reynolds number. Kiaoulias et al [10] evaluated the effects of the orifice inlet geometry on the injector pressure drop and jet breakup length. Their results indicated that adopting a larger orifice diameter resulted in a smaller pressure drop across the injector.…”

Section: Introductionmentioning

confidence: 99%

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An Experimental and Numerical Study on the Cavitation and Spray Characteristics of Micro-Orifice Injectors under Low-Pressure Conditions

Chen,

Yang,

Ouyang

2024

Energies

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A fuel injector plays a crucial role in an internal combustion engine, and the occurrence of cavitation inside the injector may affect the engine’s spray, atomization, and combustion efficiency. In this study, a micro-turbojet engine equipped with a micro-orifice fuel injector was developed that operated under low injection pressure (Pinj), that is, at a low Reynolds number (Re). Given the paucity of cavitation studies conducted under such conditions, the current study experimentally and numerically investigated the cavitation and spray characteristics of water and kerosene in a micro-orifice injector with a diameter of 0.3 mm. The results indicated that the water and kerosene exhibited no cavitation, cavitation, supercavitation, and hydraulic flip. However, the discharged jet was unaffected by internal flows, and the jet angles remained nearly constant, indicating that the cavitation in micro-orifice injectors at a low Re is less important than that at a high Re. Because cavitation in micro-orifice injectors under a low Re has no positive effects on the atomization and spray, determining the geometry of a micro-injector is essential. The injector with a length-to-diameter (L/D) ratio of 3 exhibited an approximately 25% higher discharge coefficient (Cd) than those of injectors with L/D ratios of 6 and 8 and, thus, is recommended for injectors in micro-turbojet engines.

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Section: Experimental Results For Flow Rate Characteristicsmentioning

confidence: 99%

Section: Characteristics Of the Discharge Coefficientmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An Experimental and Numerical Study on the Cavitation and Spray Characteristics of Micro-Orifice Injectors under Low-Pressure Conditions

Chen,

Yang,

Ouyang

2024

Energies

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“…Another example of this type of research can be found in experimental studies 30 , which evaluated the effect of the inlet geometry of elongated orifices (sharp-edged and chamfered) of rocket engine injectors in fluid flow. The paper 30 assessed the impact of orifice diameter and thickness on the formation of cavitation phenomena in turbulent flow, improving liquid fuel atomisation in the combustion chamber.…”

Section: Introductionmentioning

confidence: 99%

Cylindrical orifice testing in laminar flow with the orifice diameter ratio β = 0.5

Golijanek-Jędrzejczyk,

Mrowiec

2023

Sci Rep

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The paper presents the results of an experimental study of a cylindrical orifice with the orifice diameter ratio β = 0.5 and the flow opening length-to-diameter ratio L/d = 1, with hydraulic oil flowing in the DN50 measuring channel. The measurements of the values characterising the oil flow were made in the laminar flow regime, for the Reynolds numbers ranging between Re = 100 to 950. Based on the experimental tests, standard flow characteristics were created for four kinematic viscosity values in the range of 13.4–33.3 cSt, for which the average value of the discharge coefficient C in the tested flow rate range of qv < 0.5 dm3/s was determined.

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Shape optimization of an orifice meter using the adjoint method and surrogate based optimization

Osman

Elsayed

Sedrak

2019

Flow Measurement and Instrumentation

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Evaluation of orifice inlet geometries on single liquid injectors through cold-flow experiments

Cited by 8 publications

References 31 publications

An Experimental and Numerical Study on the Cavitation and Spray Characteristics of Micro-Orifice Injectors under Low-Pressure Conditions

An Experimental and Numerical Study on the Cavitation and Spray Characteristics of Micro-Orifice Injectors under Low-Pressure Conditions

Cylindrical orifice testing in laminar flow with the orifice diameter ratio β = 0.5

Shape optimization of an orifice meter using the adjoint method and surrogate based optimization

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