DNS of an Oblique Jet in a Particle-Laden Crossflow: Study of Solid Phase Preferential Concentration and Particle-Wall Interaction

Agati, Giuliano; Borello, Domenico; Camerlengo, Gabriele; Rispoli, Franco; Sesterhenn, Jörn

doi:10.1007/s10494-020-00150-0

Cited by 6 publications

(4 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Subsequently, researchers have made significant progress in obtaining accurate flow field structures and parameter distributions through the use of sophisticated numerical methods and models. These advancements in numerical simulations have also led to the development of various forms of secondary injection that cater to specific engineering requirements, such as pulsed jet [31][32][33], gas-solid two-phase injection [34][35][36], and liquid secondary injection [37][38][39][40]. Numerous scholars have conducted research and analysis on liquid secondary injection.…”

Section: Advancements In Secondary Jet Researchmentioning

confidence: 99%

“…In addition to gas and liquid jet injection, with the development of solid fuel scramjet engines in recent years, the injection of fuel jets consists of solid particles and gas has also become a research focus. Analysis of solid particle behavior in supersonic flow has mainly been seen in recent years, with previous studies primarily focusing on particle motion in low-speed airflow and within the laminar interface of supersonic airflow [34][35][36]. In 2022, Ding [103] developed a computational program for supersonic gas-solid two-phase flow based on the Open FOAM software.…”

Section: Fuel Mixing In a Scramjet Enginementioning

confidence: 99%

See 1 more Smart Citation

Research Progress on Active Secondary Jet Technology in Supersonic Flow Field of Aerospace Propulsion Systems

Zhu,

Guo,

Sun

et al. 2023

Fluids

View full text Add to dashboard Cite

As humans continue to explore the aerospace field, higher demands have been placed on new types of propulsion systems. Meanwhile, active secondary flow has been applied to various aspects of engines over the past seventy years, significantly enhancing engine performance. For the new generation of propulsion systems, active secondary flow remains a highly promising technology. This article provides an overview of the application of active secondary flow in engines, including a review of the past research on the secondary jet flow field, and an introduction of the more prominent applications of the jet in engines and its research progress. Finally, the problems existing in the current application of the secondary jet are summarized, and the future direction of the research is anticipated.

show abstract

Section: Advancements In Secondary Jet Researchmentioning

confidence: 99%

Section: Fuel Mixing In a Scramjet Enginementioning

confidence: 99%

Research Progress on Active Secondary Jet Technology in Supersonic Flow Field of Aerospace Propulsion Systems

Zhu,

Guo,

Sun

et al. 2023

Fluids

View full text Add to dashboard Cite

show abstract

“…Among other issues, the deposition of particle entrained by the inlet air on the compressor blades alters the flow passage geometry provoking compressor derating. The operating conditions of the machine affects the particle deposition phenomenon [3][4][5][6]. According to Meher-Homji et al [1] and Brooks [5], losses due to particle depositions are classified as recoverable, since they can be recovered during the engine operations without any parts replacement.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of water washing efficiency and erosion risk in an axial compressor for different water injection conditions

Agati

Gruttola

Gabriele³

et al. 2021

E3S Web Conf.

Self Cite

View full text Add to dashboard Cite

Gas turbines performance losses are mainly due to the deposition of dirt on the compressor blades that needs to be periodically removed. This is the reason motivating the presence of water washing systems (WWS) in most of the compressor gas turbines. Water washing is generally achieved by installing a number of nozzles on the compressor casing and spraying water that clean the dirty surfaces of the compressor. The side effect of such a technique is the rising risk of erosion due to the impact of water droplets on the compressor blades which is even more pronounced when dealing with online water washing systems that is done while the unit is at normal load. The design of these systems must balance benefits and disadvantages associated to the process itself. The benefits can be measured in terms of water washing efficiency that is a quantity not uniquely defined. In previous works, the authors introduced some indices useful to evaluate the spatial cleaning coverage (the wet to the total surface) and the quantity of water mass actually impacting the dirty surfaces (the impacted to injected mass). On the other hand, water washing erosion is a complex phenomenon depending on several parameters, such as the mechanical properties of the blade material, the impact velocity and angle and the droplet diameter. For this reason, the WWS are strongly influenced by the adopted nozzles and by the injection conditions. The present paper aims at assessing water washing for six different injection conditions in the first stage of a real axial compressor. Two-phase CFD simulations are carried out with Ansys Fluent where a User Defined Function implemented by the authors is used to properly model water droplet erosion mechanism and to obtain all the quantities needed to evaluate the washing quality. Results confirm the strong influence of the injection conditions on the main features of the washing system. The study is part of an ongoing partnership between Baker Hughes and Sapienza University of Rome aiming at maximizing the washing of the compressor blades while maintaining the erosion under specific thresholds.

show abstract

“…The growth of deposit layer leads to a variation of the airfoil geometry, thus increasing pressure drops and altering the aerodynamic performance of the involved blades. Some key features of particles deposition formation, for instance, were highlighted in [5], while in [6] the physics behind the accumulation of particulate in the wall region in cooled turbine stages was investigated.…”

Section: Introductionmentioning

confidence: 99%

Water washing of axial flow compressors: numerical study on the fate of injected droplets

Agati

Gruttola

Gabriele³

et al. 2020

E3S Web Conf.

Self Cite

View full text Add to dashboard Cite

In turbomachinery applications blade fouling represents a main cause of performance degradation. Among the different techniques currently available, online water washing is one of the most effective in removing deposit from the blades. Since this kind of washing is applied when the machine is close to design conditions, injected droplets are strongly accelerated when they reach the rotor blades and the understanding of their interaction with the blades is not straightforward. Moreover, undesirable phenomena like blades erosion or liquid film formation can occur. The present study aims at assessing droplets dragging from the injection system placed at the compressor inlet till the first stage rotor blades, with a focus on droplets impact locations, on the washing process and the associated risk of erosion. 3D numerical simulations of the whole compressor geometry (up to the first rotor stage) are performed by using Ansys Fluent to account for the asymmetric distribution of the sprays around of the machine struts, IGV and rotor blades. The simulations are carried out by adopting the k-ε realizable turbulence model with standard wall functions, coupled with the discretephase model to track injected droplets motion. Droplets-wall interaction is also accounted for by adopting the Stanton-Rutland model which define a droplet impact outcome depending on the impact conditions. The induced erosion is evaluated by adopting an erosion model previously developed by some of the authors and implemented in Fluent through the use of a User Defined Function (UDF). Two sets of simulations are performed, by considering the rotor still and rotating, representative of off-line and on-line water washing conditions, respectively. In the rotating simulation, the Multiple Reference Frame Model is used. The obtained results demonstrate that the washing process differs substantially between the fixed and the rotating case. Moreover, to quantify the water washing effectiveness and the erosion risk, new indices were introduced and computed for the main components of the machine. These indices can be considered as useful prescriptions in the optimization process of water washing systems.

show abstract

DNS of an Oblique Jet in a Particle-Laden Crossflow: Study of Solid Phase Preferential Concentration and Particle-Wall Interaction

Cited by 6 publications

References 31 publications

Research Progress on Active Secondary Jet Technology in Supersonic Flow Field of Aerospace Propulsion Systems

Research Progress on Active Secondary Jet Technology in Supersonic Flow Field of Aerospace Propulsion Systems

Evaluation of water washing efficiency and erosion risk in an axial compressor for different water injection conditions

Water washing of axial flow compressors: numerical study on the fate of injected droplets

Contact Info

Product

Resources

About