Theoretical and Experimental Study of Turbulent Gas Flow Through a Pneumatic Mechanism

Stanciu, Tamara

doi:10.5593/sgem2018/3.2/s15.153

Cited by 3 publications

(3 citation statements)

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“…In restrictor 1, which is a Laval nozzle, the flow is turbulent for a short time and then becomes stationary. The orifice in the thin-walled cylinder is a nozzle (restrictor 2) (Stanciu, 2018).…”

Section: Theoretical Calculationmentioning

confidence: 99%

“…The ratio of downstream and upstream pressures is lower than the critical air ratio and in this case the theoretical mass flow is the critical one and it is constant on the pneumatic circuit after the restrictor (Carafoli, 1984): -gas constant A -normal cross-sectional area of the hole with the cylinder (Stanciu, 2018). For both versions there is the same mass flow rate:…”

Section: Theoretical Calculationmentioning

confidence: 99%

“…The experimental results obtained by the measurements made on the tester for the two geometric versions of piston inlet mechanism (Stanciu, 2018) Nr. We calculated the inspire resistances for each version for the depression that generated the maximum constant flow.…”

Section: Table Nomentioning

confidence: 99%

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Experimental validation of theoretical calculation and numerical simulation for optimization of divers’s breathing apparatus

Stanciu

Scupi

Dinu

2018

Scientific Bulletin

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In order to optimize the breathing apparatus in the open circuit for divers, theoretical calculus and numerical simulation of resistances specific to the potential flow of gas through the studied circuit were made. Respiratory gas flow simulation through three constructive versions of the second stage pressure reducer intake mechanism was done after modeling the respiratory air circuit through the two main restrictors: the first variable (between the seat and the piston) and the second fixed (the hole in the cylindrical piston). The results regarding the theoretical calculation and numerical simulation have been validated by experimental testing of two of the studied models. Experimental measurements were made on a tester at the Diving Center of Constanta's Hyperbaric Laboratory. The volume flow rate of supplied respiratory gas was recorded, together with the inspire depression that opens the mechanism, until the maximum flow rate for each constructive version. After validating the results of the theoretical calculation and numerical simulation on the two models, the conclusion is the same: the resistance decreases if the geometry of the cylindrical hole in the piston (the second fixed restrictor) changes in a conical hole

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Section: Theoretical Calculationmentioning

confidence: 99%

Section: Theoretical Calculationmentioning

confidence: 99%

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Experimental validation of theoretical calculation and numerical simulation for optimization of divers’s breathing apparatus

Stanciu

Scupi

Dinu

2018

Scientific Bulletin

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Study of chilled water plant heat exchange for special ships

Volintiru

Scurtu

Stefănescu

2019

J. Phys.: Conf. Ser.

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The sizing of the air conditioning chilled water plant components shall be carried out considering both the summer and winter operating modes. Some devices are used in both modes, and others only in one of two working loads. Depending on the sources of harmful substances from the air conditioning spaces served, can be selected one of the following air recirculation systems: no recirculation (complete replacement with fresh air); partial recirculation (partial replacement of vicious air with fresh air); total recirculation (no fresh air injection).

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Addressing Environmental Concerns in Tertiary Education

Ozdemir¹

2021

SBNA

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The gas admission through the divers' breathing apparatus is done with a critical flow. The gas storage pressure is reduced to the value of the external pressure 𝑝𝑒 . The paper approaches the gas-dynamic phenomena that occur when the gas flows through the second stage regulator, respectively: the variable restrictor A (between the seat and the cylindrical piston) and the fixed restrictor B (the orifice of cylindrical piston). The two main pressure restrictors can be considered Laval nozzles. Mathematical modeling of airflow through restrictors was done following the notions of the theory of potential gas flow through tubes and nozzles. The air flow was calculated numerically and by CFD simulation and was experimentally verified at a professional stand for the second stage.

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Theoretical and Experimental Study of Turbulent Gas Flow Through a Pneumatic Mechanism

Cited by 3 publications

References 0 publications

Experimental validation of theoretical calculation and numerical simulation for optimization of divers’s breathing apparatus

Experimental validation of theoretical calculation and numerical simulation for optimization of divers’s breathing apparatus

Study of chilled water plant heat exchange for special ships

Addressing Environmental Concerns in Tertiary Education

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