Abstract
To investigate the effect of structural parameters on the performance of an annular slot ejector, a series of numerical simulations were conducted with single-factor analysis. Moreover, a multifactor grey relational analysis was applied to examine the correlations between the structural parameters and entrainment ratio. Subsequently, the optimised model was verified by comparing the simulated results with experimental data. Results show that the performance of the optimised ejector model was improved. The RNG k-ε turbulent transport mode can simulate the internal field characteristics of an annular slot ejector, and the corresponding simulated results, as verified by experiment, satisfy engineering requirements. In addition, a quantitative correlation between structural parameters and entrainment ratio was obtained as follows: e (nozzle clearance) > θ (diffusing chamber angle) > HL (mixing chamber length) > d (throat diameter) > KL (diffusing chamber length). This work may provide a certain guiding significance for the design and application of annular slot ejectors.
Highlights
An annular slot ejector is a mechanical device which is different from a central jet [1,2,3,4]
V (m3/s) experimental data, which indicates that the RNG-k-ε turbulent transport mode can simulate the flow characteristics of the gas in the ejector
Nine groups of primary pressure conditions were analysed using a set of experiments based on the optimised model to verify the accuracy of the simulated entrainment ratio; the corresponding results indicated that the two methods were consistent
Summary
An annular slot ejector is a mechanical device which is different from a central jet [1,2,3,4]. Same model and working conditions were verified by Kim et al employing CFD methods They pointed out that the stagnation pressure ratio is another important parameter affecting ejector performance [28, 29]. Jain et al developed a new ejector model with two nozzles to investigate the relationship between the structural parameters (nozzle clearance and throat diameter) and the flow characteristic. Ey suggested that the nozzle clearance has a significant influence on the flow velocity, and the larger the throat diameter is, the faster the mixing layer is developed [10]. A set of numerical simulations were conducted using single-factor analysis and multifactor analysis to investigate annular slot ejector performance including five structural parameters (namely, mixing chamber length, diffusion chamber length, diffusion chamber angle, throat diameter, and nozzle clearance). The optimised model was verified and analysed by conducting a series of experiments to compare with the results of numerical simulation
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