A 1-D analysis of ejector performance

Huang, Bin‐Juine; Chang, J. R.; Wang, C.P.; Petrenko, V.A.

doi:10.1016/s0140-7007(99)00004-3

Cited by 876 publications

(466 citation statements)

References 10 publications

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“…One of the possible ways to reduce these discrepancies is to include friction and others losses that take place within the ejector mixing chamber and ejector diffuser. Further, it is necessary to analyse experimental and numerical 02059-p. 4 results more thoroughly to deeply understand flow processes inside the mixing chamber and include and describe all phenomena to predict the chocking conditions more precisely. Figure 8.…”

Section: Resultsmentioning

confidence: 99%

“…This approach allows calculation of ejector efficiency, which is defined as (16) where p 4 is back-pressure, i.e. the pressure at the diffuser exit.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…Many theoretical and experimental studies have been carried out to obtain the performance of ejectors so far. For more information, see [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

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Development of an Analytical Method for Predicting Flow in a Supersonic Air Ejector

Kracik

Dvořák

2016

EPJ Web of Conferences

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Abstract. The article deals with development of an analytical method for predicting flow in an ejector with twelve supersonic nozzles, which are located at the periphery of the mixing chamber of the ejector. Supersonic primary air stream makes the investigation more complex. The secondary air (atmospheric) is sucked in direction of the ejector axis. The shape of the mixing chamber is convergent -divergent and a throat is formed behind the primary nozzles. Each of the primary nozzles can be treated independently so there can be various number of nozzles under operation in the ejector. According to previous investigations, constant pressure mixing is assumed to occur inside a part of the mixing chamber. The method under investigation is considered for isentropic flow in the first approximation and after that the stagnation pressure corrections at the inlets are considered. Furthermore, the decrease in stagnation pressure in the mixing chamber is considered to take losses in the mixing chamber and diffuser into account. The numerical data of the stagnation pressure has been obtained from Ansys Fluent software. In addition, a comparison with previous experimental results is introduced.

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Section: Resultsmentioning

confidence: 99%

“…This approach allows calculation of ejector efficiency, which is defined as (16) where p 4 is back-pressure, i.e. the pressure at the diffuser exit.…”

Section: Theoretical Analysismentioning

confidence: 99%

See 1 more Smart Citation

Development of an Analytical Method for Predicting Flow in a Supersonic Air Ejector

Kracik

Dvořák

2016

EPJ Web of Conferences

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“…Afterwards, a series of shock waves takes place such that the flow is subsonic at the beginning of the diffuser, where it compresses to outlet conditions. At fixed inlet conditions, two operating regimes can be recognized depending on the value of the outlet pressure P out relative to a certain threshold P lim [10]. For P out < P lim , the secondary mass flow rateṁ sec is choked between the primary jet and the outer wall, such that total mass flow rate is at a maximum and independent of the exit pressure.…”

Section: Introductionmentioning

confidence: 99%

“…For single-phase ejectors, the entrainment ratio is assumed to be a function of the Effective Area, i.e., the annular passage between the motive jet and the Constant Area Section (CAS) walls where the choking of the secondary flow occurs [14]. The pioneering model applying this concept is the one proposed by Huang et al [10], which calculates the double-choke entrainment ratio and CAS diameter of gas ejectors, given the inlet operating conditions and motive nozzle dimensions. The model assumes isentropic perfect gas behavior and divides the ejector in key regions: motive nozzle, secondary inlet, mixture before and after the shock and diffuser.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Modelling of Supersonic Gas Ejector with Droplets

Croquer

Poncet

Aidoun

2017

Entropy

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This study presents a thermodynamic model for determining the entrainment ratio and double choke limiting pressure of supersonic ejectors within the context of heat driven refrigeration cycles, with and without droplet injection, at the constant area section of the device. Input data include the inlet operating conditions and key geometry parameters (primary throat, mixing section and diffuser outlet diameter), whereas output information includes the ejector entrainment ratio, maximum double choke compression ratio, ejector efficiency, exergy efficiency and exergy destruction index. In single-phase operation, the ejector entrainment ratio and double choke limiting pressure are determined with a mean accuracy of 18% and 2.5%, respectively. In two-phase operation, the choked mass flow rate across convergent-divergent nozzles is estimated with a deviation of 10%. An analysis on the effect of droplet injection confirms the hypothesis that droplet injection reduces by 8% the pressure and Mach number jumps associated with shock waves occuring at the end of the constant area section. Nonetheless, other factors such as the mixing of the droplets with the main flow are introduced, resulting in an overall reduction by 11% of the ejector efficiency and by 15% of the exergy efficiency.

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Venturi Loop Reactor

Pangarkar

2014

Design of Multiphase Reactors

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A 1-D analysis of ejector performance

Cited by 876 publications

References 10 publications

Development of an Analytical Method for Predicting Flow in a Supersonic Air Ejector

Development of an Analytical Method for Predicting Flow in a Supersonic Air Ejector

Thermodynamic Modelling of Supersonic Gas Ejector with Droplets

Venturi Loop Reactor

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