Experimental and numerical analysis of the structure of pseudo-shock systems in laval nozzles with parallel side walls

Gawehn, Thomas; Gülhan, Ali; Al-Hasan, Nisar; Schnerr, Günter

doi:10.1007/s00193-010-0263-1

Cited by 36 publications

(11 citation statements)

References 25 publications

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“…Gawehn et al [243] compared simulations results using k-ω SST and RSM with wall pressure measurements and flow visualisations and found good agreement for the pressure but discrepancies in the flow structure.…”

Section: Turbulence Modelingmentioning

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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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: Turbulence Modelingmentioning

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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“…For example, Troy et al [9] simulated the shock train in a scramjet engine using the 2-D VULCAN CFD code for inflow Mach numbers of 1.8 and 3, afterwards, they developed this code for a 3-D transient model of the isolator. The structure of pseudo-shock systems in a system of two choked Laval analyzed experimentally and numerically by Gawehn et al [10] which they discussed that the steady case is much better than the unsteady case to predict shock structure and pressure distribution along the primary nozzle wall. The effects of the divergence angle on the shock train in the scramjet isolator are investigated by Huang et al [11].…”

Section: Introductionmentioning

confidence: 98%

Three dimensional CFD investigation of shock train structure in a supersonic nozzle

2015

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“…The flow recirculation arises due to suction created in the base region and because of the existence of a dominant vortex in the base of the tube [6], [7]. Many of the researchers have studied and solved this type of problem using computational fluid dynamics (CFD) method [8], [9], [2] and for supersonic flows over the wedge [10]. However, the study has also been performed in a CD nozzle for suddenly expanded duct with the effect of Mach number, L/D, area ratio and total thrust force of the duct.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research of Wall Pressure Distribution and Effect of Micro Jet at Mach 1.5

Azami¹,

Faheem²,

Aabid³

et al. 2019

ijrte

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In this paper, a study on the effect of the control on the wall pressure as well as the quality of the flow when tiny jets were employed. The small jet aimed to regulate the base pressure at the base region of the suddenly expanded duct and wall pressure distribution is carried out experimentally. The convergent-divergent (CD) nozzle with a suddenly expanded duct was designed to observe the wall pressure distribution with and without control using small jets. In order to obtain the results with the effect of controlled four tiny jets of 1 mm diameter located at a ninety-degree interval along a pitch circle diameter (PCD) of 1.3 times the CD nozzle exit diameter in the base, region was employed as active controls. The Mach numbers of the rapidly expanded are 1.5. The jets were expanded quickly into an axis-symmetry duct with an area ratio of 4.84. The length-todiameter (L/D) ratio of the rapid expansion duct was diverse from 10 to 1. There is no adverse effect due to the presence of the tiny jets on the flow field as well as the quality of the flow in the duct

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Experimental and numerical analysis of the structure of pseudo-shock systems in laval nozzles with parallel side walls

Cited by 36 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

Three dimensional CFD investigation of shock train structure in a supersonic nozzle

Experimental Research of Wall Pressure Distribution and Effect of Micro Jet at Mach 1.5

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