Application of Chevron Nozzle to a Supersonic Ejector–diffuser System

Kong, Fan Shi; Kim, Heuy Dong; Jin, Yingzi; Setoguchi, Toshiaki

doi:10.1016/j.proeng.2013.03.107

Cited by 16 publications

(8 citation statements)

References 12 publications

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“…More recently, [32][33][34] conducted theoretical investigations on several other nozzle geometries. In particular, lobed nozzles allow for improving both the entrainment and the compression ratio, according to the numerical and experimental study of [33].…”

Section: Ejector Geometrymentioning

confidence: 99%

“…Kong et al [34] performed CFD simulations on chevron nozzles ( Figure 7b). Results showed average improvements of entrainment and compression ratios of up to 14.8% and 8.5% respectively.…”

Section: Ejector Geometrymentioning

confidence: 99%

“…In summary, Eames et al's CRMC solution is simple and has been tested to a certain extent by other researchers, even though more data are still required and extended conditions have yet to be investigated. Complex nozzle geometries as proposed by [24,25,32,34] have not yet been tested experimentally and need further exploration. Some ejector geometries of interest proposed in the literature and introduced above are listed in Table 1, below.…”

Section: Ejector Geometrymentioning

confidence: 99%

“…Established design references recommend length selection typically between 3 and 5 diameters of the second throat, as generally observed with air and steam [1]. However specific designs with diverse fluids, mainly refrigerants, sometimes used up to 15 diameters [34,47,52,91].…”

Section: The Mixing Chamber Throat Lengthmentioning

confidence: 99%

See 3 more Smart Citations

Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 1: Single-Phase Ejectors

et al. 2019

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Ejectors used in refrigeration systems as entrainment and compression components or expanders, alone or in combination with other equipment devices, have gained renewed interest from the scientific community as a means of low temperature heat recovery and more efficient energy use. This paper summarizes the main findings and trends, in the area of heat-driven ejectors and ejector-based machines, using low boiling point working fluids, which were reported in the literature for a number of promising applications. An overall view of such systems is provided by discussing the ejector physics principles, as well as a review of the main developments in ejectors over the last few years. Recent achievements on thermally activated ejectors for single-phase compressible fluids are the main focus in this part of the review. Aspects related to their design, operation, theoretical and experimental approaches employed, analysis of the complex interacting phenomena taking place within the device, and performance are highlighted. Conventional and improved ejector refrigeration cycles are discussed. Some cycles of interest employing ejectors alone or boosted combinations are presented and their potential applications are indicated.

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Section: Ejector Geometrymentioning

confidence: 99%

“…Kong et al [34] performed CFD simulations on chevron nozzles ( Figure 7b). Results showed average improvements of entrainment and compression ratios of up to 14.8% and 8.5% respectively.…”

Section: Ejector Geometrymentioning

confidence: 99%

Section: Ejector Geometrymentioning

confidence: 99%

Section: The Mixing Chamber Throat Lengthmentioning

confidence: 99%

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Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 1: Single-Phase Ejectors

et al. 2019

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“…The jet nozzle blows a high-speed primary jet into the filter vessel to form the primary flow of pulse gas. The primary pulse gas creates a low-pressure zone around the pulse nozzle and generates suction momentum of the surrounding fluid, which induces a secondary airflow [10,11]. The formation of the secondary gas flow is advantageous in a few ways to the operation of the filter unit.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a Novel Nozzle Used for Pulse Jet Filtration Using CFD Simulation Method

Li¹,

Li²,

Choi³

2016

Int. j. simul. model.

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The nozzle is one of the most important components of pulse jet systems. The optimization of a pulse jet system and its optimal operation condition are barely known because of the complicated turbulent mixing, compressibility effects, and even flow unsteadiness, which are generated in the nozzle system. In this study, a three-dimensional numerical model of a pulse jet system was established to analyse its operation characteristics by using computational fluid dynamics (CFD). The CFD simulation results were validated with existing experimental data. The flow dynamics of the pulse jet gas around the cleaning nozzle was numerically explored to predict the effects of nozzle shape and dimensions on the pulse cleaning performance in terms of pressure distribution, velocity distribution, primary mass, secondary mass, and entrainment ratio. The influences of the convergent ratio in the narrow (R ch ) and wide (R cw ) directions, as well as that of the divergent ratio (R dw ) in the wide direction, for the nozzle were discussed. Results show that the flow dynamics are most sensitive to changes of R ch among of R ch , R cw , and R dw , The entrainment ratio (R en ) increases with R ch , R dw , and R dw . The primary and secondary masses decrease with increasing R ch and R dw . The primary and secondary masses increase with R dw . The conclusions obtained in the study provide guidelines for designing a rectangular slot nozzle for pulse jet cleaning of the filter elements.

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Analytical and computational studies on the vacuum performance of a chevron ejector

2016

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Application of Chevron Nozzle to a Supersonic Ejector–diffuser System

Cited by 16 publications

References 12 publications

Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 1: Single-Phase Ejectors

Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 1: Single-Phase Ejectors

Analysis of a Novel Nozzle Used for Pulse Jet Filtration Using CFD Simulation Method

Analytical and computational studies on the vacuum performance of a chevron ejector

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