Realization of novel constant rate of kinetic energy change (CRKEC) supersonic ejector

Kumar, Virendra; Singhal, Gaurav; Subbarao, P.M.V.

doi:10.1016/j.energy.2018.08.184

Cited by 27 publications

(18 citation statements)

References 25 publications

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“…The result shows that at the same operating conditions, the CRMC ejector presents higher entrainment ratio (37%-40%) than the CPM ejector, with negligible variation of the outlet pressure. Even more recently Kumar et al [24] proposed an alternative to CRMC, based on kinetic energy exchange between flow streams, which the authors believe may be closer to ejector flow physics but has yet to be developed and supported by experiments.…”

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%

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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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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%

Section: Ejector Geometrymentioning

confidence: 99%

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 local Fanning friction factor (f) was derived by using the Darcy friction factor and Swami Jan equation [13].…”

Section: One-dimensional Theory For Mixing Section Designmentioning

confidence: 99%

“…The later study [12] modified the CRMC approach considering the frictional effect in the model to design the complete ejector system. A similar method, i.e., Constant Rate Kinetic Energy change, is proposed by Kumar et al [13].…”

Section: Introductionmentioning

confidence: 99%

Effect of nozzle exit position (NXP) on variable area mixing ejector

Kumar

Subbarao²,

Singhal

2019

SN Appl. Sci.

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A number of numerical and experimental studies have been devoted to the modeling of high-performance steady-flow ejectors in different fields of application. This study presents a comprehensive numerical, experimental study and analysis on the effect of nozzle exit position (NXP) on variable area mixing ejector. The variable area mixing ejector has been developed based on a one-dimensional constant rate momentum change gas dynamic theory. The study is performed at various NXPs for a fixed geometry and operating conditions of an ejector for air as a working fluid. It is observed that the global performance parameter entrainment ratio (ω) is very sensitive to the NXP for a fixed geometry and operating condition. Results indicate that the numerical and experimental maximum entrainment ratios (i.e., 0.591 and 0.512) occur at NXP 0 (on-design) and 1 cm, respectively. The overall best performance can be achieved at on-design working conditions (i.e., NXP = 0) for variable area mixing ejector.

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“…Later Kumar et al (2013) modified this CRMC one-dimensional gas dynamic theory for all the ejector components with a frictional effect for an ideal gas. The alternate model based on the constant rate of kinetic energy change (CRKEC) with a frictional effect has also been tested by Kumar et al (2018) for an ideal gas. Both the CRMC and CRKEC model eradicates the constant area section of the CAM and CPM ejector.…”

Section: Introductionmentioning

confidence: 99%

Analytical and Numerical Study on the Performance of ‎Supersonic Ejector at Different Operating Conditions ‎and Working Fluids

2021

JAFM

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The computation of ejector geometry for a given fluid is essential and plays a crucial role in creating an ejector profile and performance analysis. The current paper discusses the constant rate of momentum change (CRMC) approach using a real gas equation for ejector design. The numerical analysis is carried to validate the analytical geometry and the effect of operating parameters on the entrainment ratio. The variation in entrainment ratio for the different working fluids has also been studied on the geometry computed for water-vapour. It is observed that the entrainment ratio of the ejector significantly varies with the change in operating conditions and working fluids. The numerically predicted entrainment ratio is ~0.354 compared to the on-design entrainment ratio 0.4 for water vapor, while the predicted entrainment ratio for other working fluids is ~0.319, ~0.314, and ~0.36 for air, N2, and CO2, respectively.

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Realization of novel constant rate of kinetic energy change (CRKEC) supersonic ejector

Cited by 27 publications

References 25 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

Effect of nozzle exit position (NXP) on variable area mixing ejector

Analytical and Numerical Study on the Performance of ‎Supersonic Ejector at Different Operating Conditions ‎and Working Fluids

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