NUMERICAL INVESTIGATION OF DIFFERENT GAS LEAKAGE BEHAVIOR IN VENTILATED CAVITATING FLOW STRUCTURE

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MAEREFAT MEHDI; TAHMASBI SOHRAB; ANSARI MOHAMMAD REZA

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Journal: Modares Mechanical Engineering Year:2016 | Volume:16 | Issue:9 Page(s): 87-96

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Title

NUMERICAL INVESTIGATION OF DIFFERENT GAS LEAKAGE BEHAVIOR IN VENTILATED CAVITATING FLOW STRUCTURE

Author(s)

MAEREFAT MEHDI | TAHMASBI SOHRAB | ANSARI MOHAMMAD REZA | Issue Writer Certificate

Keywords

VENTILATED CAVITATING FLOW GAS LEAKAGE BEHAVIOR SUPER CAVITATIONQ1

Abstract

In ventilated cavitating flow structure, two parameters are very important, Fr number and gas entrainment coefficient.The objective of this paper is to investigate the ventilated cavitating flow structure by numerical methods and verify with experimental results. The numerical simulation is performed by ANSYS-FLUENT and homogenous mixture model with a free slip velocity and DES turbulence model, and the gravity effect is considered. The results show when the gas entrainment coefficient Qv is constant, two typical mechanisms of the gas leakage exist at different Fr numbers, namely toroidal vortex mode and two hollow tube vortex mode. With the increasing of Fr, the cavity would transfer from the two hollow tube vortices to the toroidal vortices. Moreover, when the Fr number keeps constant, the enlargement of the cavity causes the gravitational effect to be more significant for the case of larger value of Qv. The result also showed that the cavity length increase has a defined value and it does not increase even with more gas flow injection. With the increasing of gas entrainment coefficient, the drag coefficient decrease. DES turbulence model is a combination of two models, SST k- w and LES model and is suitable for simulating of two hollow tube vortices mode.

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APA: Copy

MAEREFAT, MEHDI, TAHMASBI, SOHRAB, & ANSARI, MOHAMMAD REZA. (2016). NUMERICAL INVESTIGATION OF DIFFERENT GAS LEAKAGE BEHAVIOR IN VENTILATED CAVITATING FLOW STRUCTURE. MODARES MECHANICAL ENGINEERING, 16(9), 87-96. SID. https://sid.ir/paper/179800/en

Vancouver: Copy

MAEREFAT MEHDI, TAHMASBI SOHRAB, ANSARI MOHAMMAD REZA. NUMERICAL INVESTIGATION OF DIFFERENT GAS LEAKAGE BEHAVIOR IN VENTILATED CAVITATING FLOW STRUCTURE. MODARES MECHANICAL ENGINEERING[Internet]. 2016;16(9):87-96. Available from: https://sid.ir/paper/179800/en

IEEE: Copy

MEHDI MAEREFAT, SOHRAB TAHMASBI, and MOHAMMAD REZA ANSARI, “NUMERICAL INVESTIGATION OF DIFFERENT GAS LEAKAGE BEHAVIOR IN VENTILATED CAVITATING FLOW STRUCTURE,” MODARES MECHANICAL ENGINEERING, vol. 16, no. 9, pp. 87–96, 2016, [Online]. Available: https://sid.ir/paper/179800/en

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