Throat diameter influence on the flow characteristics of a critical Venturi sonic nozzle

Li, Chunhui; Cao, Peijuan; Zhang, Han; Cui, Lishui

doi:10.1016/j.flowmeasinst.2018.02.012

Cited by 12 publications

(7 citation statements)

References 5 publications

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“…The experimental Cd of this sonic nozzle at different Reynolds number were conducted by two pVTt gas flow standard facilities constructed in 1986 and 2014 respectively at NIM, China [9] . One apparatus with the expanded uncertainty of FLOMEKO 2022, Chongqing, China Pag.…”

Section: Results Of the CDmentioning

confidence: 99%

“…By fitting the experimental data of each nozzle with the reference of 'S-CURVE' by Ishibahsi [5] , the curve of the Cd covered the whole boundary layer of laminar, transition and turbulent flows, where defines the Reynolds number from laminar to transition regime as 'Begin Reynolds number, Retr,beg', and the Reynolds number turning into full turbulence regime defined as 'End Reynolds number, Retr,end', namely the beginning and ending positions of the viscous flow transition. The Retr,beg and Retr,end corresponding to different throat diameter were obtained in paper [9] .…”

Section: Results Of the CDmentioning

confidence: 99%

“…未找到引用源。 found that the influence of surface roughness in the turbulent boundary layer is larger than in the laminar boundary layer and proposed the dimensionless relative roughness should be considered rather than an absolute roughness value. In 2018, Li [9] studied the influence mechanism of throat diameter on the boundary layer flow characteristics of sonic nozzle, and pointed out the Cd and the Retr are both influenced by the throat diameter.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Different Conditions on the Boundary Layer Transition of Sonic Nozzle

Cao¹,

Sun²,

Zhang³

et al. 2023

Proceedings of the 19th International Flow Measurement Conference 2022 on Flow Measurement - FLOMEKO 2022

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The boundary layer transition of sonic nozzle is affected by many factors, including Reynolds number, macro structure (throat diameter), meso-micro surface structure (wall roughness, waviness), turbulence intensity, wall heat transfer and so on. Therefore, in order to analyse the influences of macrostructure, meso-micro surface structure and turbulence intensity on boundary layer transition, the Cd and geometric dimension (throat diameter, d, average roughness, Ra, maximum roughness, Rz, and waviness, wa) of sonic nozzles with throat diameter of 1.919 mm, 3.808mm, and 7.453 mm were experimental investigated and measured. Furthermore, a series of CFD simulations through the transition SST model for axisymmetric nozzles were established to research the variation law of boundary layer transition and Cd of the sonic nozzle when Reynolds numbers ranges from 4.6×10 4 to 4.7×10 7 and different turbulence intensity (Tu) and meso-micro surface structure (Ra, Rz and wa). The validity of the simulation model was confirmed by the experimental data of National Institute of Metrology of China (NIM). Finally, the relationships between the boundary layer transition and Tu, Ra, Rz and wa were obtained.

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Section: Results Of the CDmentioning

confidence: 99%

Section: Results Of the CDmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Different Conditions on the Boundary Layer Transition of Sonic Nozzle

Cao¹,

Sun²,

Zhang³

et al. 2023

Proceedings of the 19th International Flow Measurement Conference 2022 on Flow Measurement - FLOMEKO 2022

View full text Add to dashboard Cite

show abstract

“…Properties of real gas are not reflected in this work, therefore, its implementation in the standard is not further commented here. An immense amount of theoretical (e.g., [5]) and experimental (e.g., [13,14,23]) works have been conducted in order to evaluate C d more accurately. Yet, some small and rather interesting problems of this -simple at first glance -flow remain open.…”

Section: Introductionmentioning

confidence: 99%

Transonic flow field in critical flow Venturi nozzle

Kreuzová

2024

ACM

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In this paper, theoretical and numerical analysis of a~transonic flow field of critical flow Venturi nozzles according to the ISO~9300 standard is performed. Deviations of the flow field from an estimate based on one dimensionality are clarified. While the theoretical analysis allows prediction of these deviations, the numerical analysis allows quantification of their influence. The main studied phenomena include the local supersonic compression in transonic expansion and the Prandtl-Meyer expansion. The tendency of the flow field to spatial oscillations is shown, alongside the ability of the system to damp these oscillations.

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“…There are two main ways to adjust the flow rate through the traditional fixed critical flow nozzle, if necessary. One is to adjust the inlet pressure [11,12], while the other is to change the nozzle throat size [13,14]. However, it is not economical to adjust the steam parameters.…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of the Flow Characteristics of an Adjustable Critical-Flow Venturi Nozzle

Yuan¹,

Gao²,

Wang³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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The response of an adjustable critical-flow Venturi nozzle is investigated through a set indoor experiments aimed to determine the related critical flow rate, critical pressure ratio, and discharge coefficient. The effect of a variation in the cone displacement and liquid content on the critical flow characteristics is examined in detail and it is shown that the former can be used to effectively adjust the critical flow rate. The critical pressure ratio of the considered nozzle is above 0.85, and the critical flow control deviation of the gas flow is within ±3%. Liquid flow can reduce the gas critical mass flow rate accordingly, especially for the cases with larger liquid volume and lower inlet pressure. The set of results and conclusions provided are intended to support the optimization of steam injection techniques in the context of heavy oil recovery processes. KEYWORDSAdjustable critical flow venturi nozzle; critical pressure ratio; critical mass flow rate; gas-liquid two-phase critical flow

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Throat diameter influence on the flow characteristics of a critical Venturi sonic nozzle

Cited by 12 publications

References 5 publications

Effect of Different Conditions on the Boundary Layer Transition of Sonic Nozzle

Effect of Different Conditions on the Boundary Layer Transition of Sonic Nozzle

Transonic flow field in critical flow Venturi nozzle

Experimental Analysis of the Flow Characteristics of an Adjustable Critical-Flow Venturi Nozzle

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