Experimental Investigation on Droplet Behavior in a Transonic Compressor Cascade

Neupert, Niklas; Ober, Birger; Joos, Franz

doi:10.1115/1.4028351

Cited by 4 publications

(4 citation statements)

References 9 publications

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“…Furthermore, illustrations of the droplet shapes taken from the simulations, described further below, show only small deformations, which is consistent with the small droplet Weber number. Neupert et al [12] further showed that the vibrational breakup (We d ≤ 12) for the present compressor cascade occurs only for higher droplet mass fractions, ξ m = 1.3% and ξ m = 2.1%. In case of a droplet mass fraction of ξ m = 1.3%, a higher incidence angle of more than α ≥ 5 • is required to cause vibrational breakup.…”

Section: Resultsmentioning

confidence: 58%

Evaporation Modeling of Water Droplets in a Transonic Compressor Cascade under Fogging Conditions

Seck

Geist

Harbeck

et al. 2020

IJTPP

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High-fogging is widely used to rapidly increase the power outputs of stationary gas turbines. Therefore, water droplets are injected into the inflow air, and a considerable number enter the compressor. Within this paper, the primary process of droplet evaporation is investigated closely. A short discussion about the influential parameters ascribes a major significance to the slip velocity between ambient gas flow and droplets. Hence, experimental results from a transonic compressor cascade are shown to evaluate the conditions in real high-fogging applications. The measured parameter range is used for direct numerical simulations to extract evaporation rates depending on inflow conditions and relative humidity of the air flow. Finally, an applicable correlation for the Sherwood number in the form of S h ( R e 1 / 2 S c 1 / 3 ) is suggested.

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Section: Resultsmentioning

confidence: 58%

Evaporation Modeling of Water Droplets in a Transonic Compressor Cascade under Fogging Conditions

Seck

Geist

Harbeck

et al. 2020

IJTPP

Self Cite

View full text Add to dashboard Cite

show abstract

“…Some researchers performed studies on the water film distribution on the turbine blade surface. Neupert et al 13 studied the water film flow on the surface of transonic compressor blades. They found that the water film on the pressure surface is continuously distributed, while the water film on the suction surface changes from a continuous film to a stream flow.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the three-dimensional flow of water film on the outer surface of the hollow stationary blade

Chen,

Zhao,

Zhang

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part A:

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In order to figure out the influence of water film on the performance of the turbomachinery, understand the mechanism of the interaction between the high-speed airflow and the water film in turbomachinery, and provide a reference for the design of the subsequent experiments and hollow stationary blade water removal by heating. The commercial software FLUENT with the Eulerian Wall Films model is used to establish a solution method for simulating the flow of water film on the blade. The accuracy of the solution method is verified by comparing it with the results of the water film thickness experiment on the surface of the plate. The distribution of the water film on the outer surface of the vane as well as the influence of the water film on the mainstream field are numerically studied in the condition of the wet steam mainstream. The results show that the gradient of water film thickness on the pressure surface is relatively gentle and is along the radial direction. The gradient of water film thickness on the suction side is along the axial direction, and the value is larger; There is a V-shaped water film agglomeration area on the suction surface near the trailing edge where the water film thickness is greater than 45.7 μm; The top areas on both the suction side and pressure side produce a local water film agglomeration area with the dual effect of the secondary flow and the centrifugal force of the mainstream; The water film flow on the blade surface has little influence of the steam velocity and the speed of the mainstream. The increase of local pressure on the surface leads to an increase in the pressure of the adjacent mainstream areas.

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“…Bettocchi et al [5] compared the performance curves of wet compression and conventional air compression and experimentally proved that the pressure ratio increased by 2% when the wet compression method was used. Neupert et al [6] visualized the flow of droplets floating inside the compressor using a particle analyzer (Laser doppler anemometry, LDA, or Particle doppler anemometry, PDA). Recently, with the development of numerical analysis technology, it has become possible to study the interior of a compressor using wet compression technology in three dimensions.…”

Section: Introductionmentioning

confidence: 99%

Wet Compression Study for an Aero-Thermodynamic Performance Analysis of a Centrifugal Compressor at Design and Off-Design Points

Kang

Kim

2022

Processes

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In this study, to analyze the effect of wet compression technology on the aero-thermodynamic performance of a centrifugal compressor, a numerical analysis study was conducted on the design point and off-design point. Wet compression technology sprays water droplets at the inlet of the compressor. During the compression process, water droplets evaporate, reducing the heat of compression and reducing the compression work, which improves the efficiency of the compressor. In wet compression technology, detailed research is needed for the application to compressors because the droplet behavior affects the internal flow. The main parameters for wet compression technology are the droplet size and injection rate selection, and the flow inside the compressor changed by the droplet behavior was analyzed. When the droplet size and injection rate were changed at the design point and the off-design point, it was confirmed that a small droplet size was effective in both areas, and it was confirmed that the performance improved as the flow rate increased. The internal flow changed greatly depending on the size of the droplet. As a result, the centrifugal compressor to which the wet compression technology was applied had a lower outlet temperature than dry compression at both the design point and the off-design point and had increases in the pressure ratio and efficiency. However, the surge margin decreased by about 2% in the surge region. The reason is that due to high-speed rotation, particles move in the outer diameter direction and are driven into a tip-leakage flow, and many stagnant flows occur without flowing into the main flow. Through the study results, it was possible to understand the effects of wet compression technology on the performance and efficiency increase of centrifugal compressors and the effects of particle behavior on the internal flow of the compressor at the off-design point.

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Experimental Investigation on Droplet Behavior in a Transonic Compressor Cascade

Cited by 4 publications

References 9 publications

Evaporation Modeling of Water Droplets in a Transonic Compressor Cascade under Fogging Conditions

Evaporation Modeling of Water Droplets in a Transonic Compressor Cascade under Fogging Conditions

Numerical study on the three-dimensional flow of water film on the outer surface of the hollow stationary blade

Wet Compression Study for an Aero-Thermodynamic Performance Analysis of a Centrifugal Compressor at Design and Off-Design Points

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