Experimental study on spray characteristics of pressure-swirl nozzles in pressurizer

Lan, Zhike; Zhu, Dahuan; Tian, Wenxi; Su, G.H.; Qiu, Suizheng

doi:10.1016/j.anucene.2013.07.048

Cited by 34 publications

(8 citation statements)

References 27 publications

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“…Figures 4 (a)~(e) compare the dimensions (Dv(90), D [4] [3], Dv(50), D [3] [2] and Dv (10)) of the atomized droplets located at different distances (7cm, 12cm and 15cm) below the TF8 nozzle. It can be seen that the greatest dimensions appeared at 7cm, following by 15cm and 12cm in descending order.…”

Section: Secondary Atomizationmentioning

confidence: 99%

“…As mentioned above, the droplet diameters include D [3] [2], D [4] [3], Dv (10), Dv(50) and Dv(90). According to the droplet size distribution patterns in Figure 3, the size of the Dv(90) droplet was the largest, followed in descending order by D [4] [3], Dv(50) , D [3] [2] and Dv (10). Whichever the diameter, the size of the atomized droplets always decreased with the increase in spray pressure.…”

Section: Effect Of Single Nozzle Backpressurementioning

confidence: 99%

“…Here, the evaluation indices include the Sauter mean diameter (D [3][2]) and several commonly used cumulative volume distribution diameters (D [4][3], Dv (10), Dv(50) and Dv(90)). These indices are explained in Table 3.…”

Section: Dimensions Of Atomized Dropletsmentioning

confidence: 99%

“…The typical theoretical formulas include the normal distribution, logarithmic normal distribution, maximum entropy distribution [1] etc. [2][3][4][5][6][7][8][9][10][11] The representative studies on spray atomization features of nozzles are as follows. Targeted at fuel atomizer nozzles, Lefebvre [12] summed up the nozzle flow, atomization, external flow and droplet distribution of many kinds of nozzles, including but not limited to flat orifice nozzles, vortex nozzles, rotating nozzles and air-assisted nozzles, and detailed the applicable ranges of various empirical formulas on droplet diameters.…”

Section: Introductionmentioning

confidence: 99%

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Stability of secondary atomization locations of atomizer nozzles for humidification chambers

Huang¹,

Zhang²,

Xu³

2017

IJHT

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This paper aims to reveal the atomization features of nozzles for humidification chambers. Targeted at three commonly used nozzles (TF6, TF8 and AM4), the author investigated into the effect of nozzle backpressure on droplet size, and examined the diameters and distribution spans of the droplets at different distances to the nozzle. The results show that the droplet diameters decreased with the increase in spray pressure. However, there was a critical value of the pressure. The location of secondary atomization was determined by analysing the atomization features at different locations below the nozzle. It is concluded that the location is 7cm below the nozzle for TF6 nozzle, 12cm below the nozzle for TF8 nozzle, and 10cm below the nozzle for AM4 nozzle. Moreover, the least square method was used to fit an empirical correlation for the droplets atomized by the nozzle in the secondary atomization area. The empirical correlation was then converted to a functional relation of the Weber number and Reynolds number. The research findings make it possible to predict the particle diameters from the nozzle exit.

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Section: Secondary Atomizationmentioning

confidence: 99%

Section: Effect Of Single Nozzle Backpressurementioning

confidence: 99%

Section: Dimensions Of Atomized Dropletsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stability of secondary atomization locations of atomizer nozzles for humidification chambers

Huang¹,

Zhang²,

Xu³

2017

IJHT

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“…Most of studies conducted in the past mainly focused on the measurement of the angle spray, nozzle spray dimension, and droplet size using testing loop and swirling nozzles experiment [5]. Spraying systems have been widely used in nuclear energy engineering, such as in the pressurizer or in the containment.…”

mentioning

confidence: 99%

Simulation of Spray Injection in the Pressurizer Using RELAP5

Dibyo

Susyadi

2017

Atom Indo.

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A modeling research using RELAP5 to assess the pressurizer of a pressurized water reactor (PWR) power plant has been performed. The heater and water injection systems in the pressurizer system of the PWR are of great importance for system pressure control. The heater is designed to increase the pressure while the water sprayer injection is to perform depressurization. Most of studies conducted in the past mainly focused on determining the effects of nozzle spray design and droplet size using testing loops. The purpose of this simulation is to analyze the spray injection flow rate against the pressure characteristics of the pressurizer using RELAP5. Through this approach, the optimum injection flow rate of full scale plant pressurizer can be analyzed. The parameters investigated are pressure and temperature. In RELAP5, the pressurizer tank was modeled with six volume nodes and the heater was modeled by using heat structure. In the model, the sprayer takes water from the cold leg to inject it into the top of tank region. The results showed that the mass flow of about 4 kg/s is the most effective value to limit pressure in the pressurizer to below 15.7 MPa. However, the flow rates of 8 kg/s and more cause overpressure. This simulation is useful to complement the data related to the water flow rate injection systems of the pressurizer.

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