Numerical and experimental investigation on flow field characteristics of organ pipe nozzle

Fang, Zhenlong; Kang, Yong; Wang, X C; Li, D; Hu, Yigang; Huang, Man; Wang, X Y

doi:10.1088/1755-1315/22/5/052020

Cited by 11 publications

(9 citation statements)

References 4 publications

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“…In recent years, SRWJs are still focused upon by a number of researchers. For example, Fang, et al [22] numerically studied the characteristics of the flow field inside the organ-pipe nozzle in order to obtain the factors affecting the performance of SRWJ. Peng et al [23] established a mathematic model to study the cavitation bubble size in the flow fields of SRWJs.…”

Section: Introductionmentioning

confidence: 99%

“…Despite a great many investigations on SRWJ, it should be noticed that the optimal values of the downstream contraction ratio of organ-pipe nozzles are still unknown and need to be studied. So far, the organ-pipe nozzles used in the research are all manufactured using an equation that only gives the ratio of the chamber length to the exit diameter [13][14][15][16][17][18][19][20][21][22][25][26][27][28][29][30][31][32], and the detailed physical parameters required for fabricating an effective nozzle have not been reported.…”

Section: Introductionmentioning

confidence: 99%

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The Effects of the Downstream Contraction Ratio of Organ-Pipe Nozzle on the Pressure Oscillations of Self-Resonating Waterjets

et al. 2018

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Self-resonating waterjets (SRWJs) are being widely used in the fields of energy exploitation, due to the significantly increased penetration rate of roller bits in deep-hole drilling. To further improve the impact and erosion abilities of SRWJs, the effects of the downstream contraction ratio of organ-pipe nozzle on the axial pressure oscillations were experimentally studied. The axial pressure oscillation peak and amplitude were used to evaluate the effects under two inlet pressures and various standoff distances. The results show that the downstream contraction ratio can affect the development trends of the pressure oscillations and determines the values of the peaks and amplitudes. Under the experimental conditions, 2.5 is the ratio that leads to the maximum peaks and amplitudes at almost all the testing standoff distances, while the ratio of 2 always results in the minimum ones. The development trend of the pressure oscillation peak for the ratio of 3.5 has a great change at an inlet pressure of 20 MPa. Generally, the relative pressure oscillations are more violent at an inlet pressure of 10 MPa, which is regardless of the contraction ratio. This study helps provide a guideline for determining the physical parameters required in the fabrication of organ-pipe nozzles used for deep-hole drilling.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Effects of the Downstream Contraction Ratio of Organ-Pipe Nozzle on the Pressure Oscillations of Self-Resonating Waterjets

et al. 2018

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“…4. The experiment was performed on a multifunction waterjet test bench, which was developed independently by our research group and had been applied in several previous investigations (Fang et al 2014;Li et al 2016).…”

Section: Facilities and Experimental Setupmentioning

confidence: 99%

The Characteristics of Self-Resonating Jet Issuing from the Helmholtz Nozzle Combined with a Venturi Tube Structure

Miao

Kang

et al. 2020

JAFM

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Self-resonating waterjet is a new type of waterjet technology that has been widely used for many practical applications. In order to further improve the performance of self-resonating waterjet, the Helmholtz nozzle was improved by replacing the upper part of a traditional contract structure with a venture tube one. This composite nozzle of a venturi tube structure and a Helmholtz resonator was proposed based on the working mechanism of self-resonating waterjet nozzles and the instability of cavitation flow in venturi tubes. Furthermore, the results were also compared with those generated by a conventional Helmholtz nozzle under the same conditions. The frequency of the pressure pulsation in the oscillating cavity and at the outlet was obtained and analyzed by the classical Fast Fourier transform (FFT) method. The results showed that the main frequency of the pressure oscillation rises to 2362.78Hz, and the peak and average values of the pressure are increased by 45% and 12.5% respectively at the outlet of the composite nozzle. In the oscillating cavity of composite nozzle, the pressure oscillations in the central region have higher frequencies and amplitudes, while near the wall are reversed.

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“…Figure 2 is thus the same as in our previous studies [20,23,25,26,33]. The experiment was performed using a multifunctional waterjet test bench that has been applied in the previous investigations [15,17,18,[20][21][22][23][24][25][26][27][28][29]33]. The test bench had a horizontal moving table with X directional motion and a loading platform that had Y and Z directional motions.…”

Section: Facilities and Proceduresmentioning

confidence: 99%

“…Liu et al [17] analyzed the oscillation mechanism of a SRWJ, by both numerical and experimental methods, and found that the cavitation clouds dominate the oscillating frequency. Moreover, Fang et al [18] numerically studied the characteristics of the flow field inside organ-pipe nozzles of different geometries, and experimentally investigated performance. Furthermore, Chahine and Genoux [19] mathematically studied the behavior of the collapse of a cavitating vortex ring within a SRWJ and claimed that the bubble ring collapse should be more erosive than that of an equivalent spherical bubble.…”

Section: Introductionmentioning

confidence: 99%

Effects of Nozzle Exit Angle on the Pressure Characteristics of SRWJs Used for Deep-Hole Drilling

Wang

Miao

et al. 2019

Applied Sciences

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The self-resonating waterjet (SRWJ) has been applied in petroleum, natural gas, and mining engineering ever since its strong erosion ability in deep-hole drilling was recognized. Aiming at further improving the working efficiency of SRWJs, the effects of the exit angle of the organ-pipe nozzle on the axial pressure oscillations of the jet were experimentally studied. Six exit angles of θ = 0°, 30°, 45°, 60°, 75°, and 90° were employed in the experiment, and the axial pressure oscillation peak (Pmax) and amplitude (Pa) were used for characterizing the performance of SRWJs. It was found that the exit angle greatly affects the axial pressure oscillations, including the development trends against the standoff distance and the magnitudes of Pmax and Pa. Under testing with two inlet pressures, the exit angle of θ = 0° always resulted in the greatest Pmax and Pa within the range of the testing standoff distance. With the increase of standoff distance, both Pmax and Pa first increased and then decreased when the exit angle was 0°; while they kept decreasing when the exit angle was 30°, 45°, 60°, 75°, and 90°. Moreover, the exit angles of θ = 90° and 60°, corresponding to inlet pressures of Pi = 10 MPa and 20 MPa, led to both the minimum magnitudes of Pmax and Pa under the experimental conditions. The results also indicate that the exit angle affects the interactions between the nozzle lip and the jet and help provide information for improving the working efficiency of SRWJs in practical applications.

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Numerical and experimental investigation on flow field characteristics of organ pipe nozzle

Cited by 11 publications

References 4 publications

The Effects of the Downstream Contraction Ratio of Organ-Pipe Nozzle on the Pressure Oscillations of Self-Resonating Waterjets

The Effects of the Downstream Contraction Ratio of Organ-Pipe Nozzle on the Pressure Oscillations of Self-Resonating Waterjets

The Characteristics of Self-Resonating Jet Issuing from the Helmholtz Nozzle Combined with a Venturi Tube Structure

Effects of Nozzle Exit Angle on the Pressure Characteristics of SRWJs Used for Deep-Hole Drilling

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